subject:(Silica particle)

Queens University

1. Ashri, Abdulrahman. The Effects of Silica Support on Kinetic Behavior and Polymer Properties of Heterogonous Metallocene Catalyst .

Degree: Chemical Engineering, 2012, Queens University

URL: http://hdl.handle.net/1974/7058

► The heterogeneous metallocene catalyst is becoming a very competitive industrially due to its ability to produce tailor-made polymers. The main advantage of the metallocene polymer… (more)

▼ The heterogeneous metallocene catalyst is becoming a very competitive industrially due to its ability to produce tailor-made polymers. The main advantage of the metallocene polymer product is the narrow molecular weight distribution (MWD) and the systematic comonomer distribution along the polymer chains. Therefore, the metallocene polymer product has well-defined mechanical and optical properties. The aim of this thesis is to investigate the effects of the silica support on the reaction kinetics and micro properties of the heterogeneous metallocene catalyst system. These investigations include studying the influence of the pore volume, surface area, particle size distribution, and the surface chemical characteristics of silica support on the catalyst performance. The experiments showed that the silica type has an influence on the kinetic behavior. For instance, silica with a lower pore volume shows an induction period when compared with higher pore volume silicas. Moreover, the silica type has a clear influence on catalyst activity and polymer morphology. The smallest silica particles produced the highest activity among the other sizes regardless of silica type. The supported catalysts were characterized and linked to the silica type and size in terms of catalyst activity and polymer morphology. Each catalyst in terms of silica type behaved similarly regardless of type of alkylaluminum used in the formulation. The micro properties of the produced polymers, such as MWD and chemical composition distribution (CCD), were studied to understand the effects of the type and size of silica support and co-catalyst on these properties. The silica types showed no effect on the MWD, but had a slight effect on the CCD. Silica with a high pore volume had a stronger more comonomer response. However, the silica particle size had an influence on the CCD, with less comonomer incorporation observed with smaller silica particles. Finally, triethylauminum was observed to produce polymer with a different MWD when compared with other alkylaluminums. However, all alkylaluminums used in this work had no effect on the CCD of the produced polymer regardless of silica type.

Subjects/Keywords: particle size ; silica ; polymerizatiom ; metallocene

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APA (6^th Edition):

Ashri, A. (2012). The Effects of Silica Support on Kinetic Behavior and Polymer Properties of Heterogonous Metallocene Catalyst . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7058

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ashri, Abdulrahman. “The Effects of Silica Support on Kinetic Behavior and Polymer Properties of Heterogonous Metallocene Catalyst .” 2012. Thesis, Queens University. Accessed January 22, 2021. http://hdl.handle.net/1974/7058.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ashri, Abdulrahman. “The Effects of Silica Support on Kinetic Behavior and Polymer Properties of Heterogonous Metallocene Catalyst .” 2012. Web. 22 Jan 2021.

Vancouver:

Ashri A. The Effects of Silica Support on Kinetic Behavior and Polymer Properties of Heterogonous Metallocene Catalyst . [Internet] [Thesis]. Queens University; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1974/7058.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ashri A. The Effects of Silica Support on Kinetic Behavior and Polymer Properties of Heterogonous Metallocene Catalyst . [Thesis]. Queens University; 2012. Available from: http://hdl.handle.net/1974/7058

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

2. Ye, Wenmin. DNA Electrophoresis in Colloidal Self-Assembled Arrays.

Degree: PhD, Department of Chemistry, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/mk61rh640

► This thesis investigates electrophoretic separation of DNA molecules in different types of separation media formed by silica nanoparticles. Particle arrays within microfluidic chips are fabricated… (more)

▼ This thesis investigates electrophoretic separation of DNA molecules in different types of separation media formed by silica nanoparticles. Particle arrays within microfluidic chips are fabricated using evaporation induced colloidal self-assembly. Methods to adjust pore size and the order of the particle lattice were developed, in order to probe the effect of lattice structure and size on separation of DNA. A stepwise packing procedure was developed to fabricate structures with stepwise gradient in pore size. Monodisperse packed structures yield pore sizes from a few nanometers to a few hundred nanometers according to the particle size being used, but the electrophoresis can only be optimized for a certain range of DNA sizes. By packing separation zones with two different pore sizes, optimal separation can be achieved for larger and smaller DNA size range, by taking advantages from both larger and smaller pore sizes within one device. The separation accomplished in the upstream region is retained as DNA moves across the zone boundary, even when the separated DNA has the same deflection angle in the downstream region. Small DNA not separated in the larger pore size is then separated in the smaller, downstream pore size. The peak capacity is improved by employment of this stepwise pore gradient. Colloidal arrays with two different sized nanoparticles mixed in various proportions are prepared, yielding structures with different degrees of disorder. The roles of order within a separation matrix on DNA separation in both asymmetric pulsed field angular separation and capillary zone electrophoresis are studied systematically. Radial distribution functions and orientational order parameters are determined to characterize the scale of disorder. In pulsed field electrophoresis, the DNA separation resolution is quantified for each structure, showing a strong dependence on order within the structure. Ordered structures give better separation resolution than highly disordered structures. However, the variation of separation performance with order is not monotonic, showing a small, but statistically significant improvement in structures with short range order compared to those with long range order. In capillary zone electrophoresis, regression analysis is conducted for the electrophoretic mobility and the dispersion coefficient. Both parameters exhibit a weak monotonic dependence on matrix order, complementary to the effect of DNA size and pore size. Higher degree of matrix order is favored by higher mobility and lower dispersion coefficient.

Subjects/Keywords: Colloidal Self-Assembly; DNA Electrophoresis; Silica Particle

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ye, W. (2012). DNA Electrophoresis in Colloidal Self-Assembled Arrays. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/mk61rh640

Chicago Manual of Style (16^th Edition):

Ye, Wenmin. “DNA Electrophoresis in Colloidal Self-Assembled Arrays.” 2012. Doctoral Dissertation, University of Alberta. Accessed January 22, 2021. https://era.library.ualberta.ca/files/mk61rh640.

MLA Handbook (7^th Edition):

Ye, Wenmin. “DNA Electrophoresis in Colloidal Self-Assembled Arrays.” 2012. Web. 22 Jan 2021.

Vancouver:

Ye W. DNA Electrophoresis in Colloidal Self-Assembled Arrays. [Internet] [Doctoral dissertation]. University of Alberta; 2012. [cited 2021 Jan 22]. Available from: https://era.library.ualberta.ca/files/mk61rh640.

Council of Science Editors:

Ye W. DNA Electrophoresis in Colloidal Self-Assembled Arrays. [Doctoral Dissertation]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/mk61rh640

3. Chou, Berryinne. Nano-Scale Modified Inorganic/Organic Hybrid Materials as Proton Conductors.

Degree: PhD, Materials Science and Engineering, 2006, Case Western Reserve University School of Graduate Studies

URL: http://rave.ohiolink.edu/etdc/view?acc_num=case1144419661

► Proton exchange membranes are a key component in the fuel cell system. Various perflurosulfonic polymers have been used to achieve high proton conductivity, such as… (more)

Subjects/Keywords: BPSH; silica particles; Silica; Sultone; membrane; Particle; treated silica

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APA (6^th Edition):

Chou, B. (2006). Nano-Scale Modified Inorganic/Organic Hybrid Materials as Proton Conductors. (Doctoral Dissertation). Case Western Reserve University School of Graduate Studies. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=case1144419661

Chicago Manual of Style (16^th Edition):

Chou, Berryinne. “Nano-Scale Modified Inorganic/Organic Hybrid Materials as Proton Conductors.” 2006. Doctoral Dissertation, Case Western Reserve University School of Graduate Studies. Accessed January 22, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1144419661.

MLA Handbook (7^th Edition):

Chou, Berryinne. “Nano-Scale Modified Inorganic/Organic Hybrid Materials as Proton Conductors.” 2006. Web. 22 Jan 2021.

Vancouver:

Chou B. Nano-Scale Modified Inorganic/Organic Hybrid Materials as Proton Conductors. [Internet] [Doctoral dissertation]. Case Western Reserve University School of Graduate Studies; 2006. [cited 2021 Jan 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1144419661.

Council of Science Editors:

Chou B. Nano-Scale Modified Inorganic/Organic Hybrid Materials as Proton Conductors. [Doctoral Dissertation]. Case Western Reserve University School of Graduate Studies; 2006. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1144419661

Universiteit Utrecht

4. Visser, M.P.E. Detection of middle to late Holocene Icelandic cryptotephras in the Netherlands: tephra versus biogenic silica.

Degree: 2012, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/240396

► Every volcano erupts ash that is characteristic for that volcano. When tephra is produced, prevailing winds can transport the tephra over large distances, where they… (more)

Subjects/Keywords: Geowetenschappen; tephra, biogenic silica, Hekla, tephra separation, particle morphology

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APA (6^th Edition):

Visser, M. P. E. (2012). Detection of middle to late Holocene Icelandic cryptotephras in the Netherlands: tephra versus biogenic silica. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/240396

Chicago Manual of Style (16^th Edition):

Visser, M P E. “Detection of middle to late Holocene Icelandic cryptotephras in the Netherlands: tephra versus biogenic silica.” 2012. Masters Thesis, Universiteit Utrecht. Accessed January 22, 2021. http://dspace.library.uu.nl:8080/handle/1874/240396.

MLA Handbook (7^th Edition):

Visser, M P E. “Detection of middle to late Holocene Icelandic cryptotephras in the Netherlands: tephra versus biogenic silica.” 2012. Web. 22 Jan 2021.

Vancouver:

Visser MPE. Detection of middle to late Holocene Icelandic cryptotephras in the Netherlands: tephra versus biogenic silica. [Internet] [Masters thesis]. Universiteit Utrecht; 2012. [cited 2021 Jan 22]. Available from: http://dspace.library.uu.nl:8080/handle/1874/240396.

Council of Science Editors:

Visser MPE. Detection of middle to late Holocene Icelandic cryptotephras in the Netherlands: tephra versus biogenic silica. [Masters Thesis]. Universiteit Utrecht; 2012. Available from: http://dspace.library.uu.nl:8080/handle/1874/240396

University of Alberta

5. Fotovati, Maryam. Aggregation and sedimentation of fine solids in non-aqueous media.

Degree: MS, Department of Chemical and Materials Engineering, 2011, University of Alberta

URL: https://era.library.ualberta.ca/files/js956h33f

► A major challenge to any “solvent-based” bitumen extraction technology is the removal of suspended fine solids from the hydrocarbon medium (i.e. diluted bitumen). To address… (more)

Subjects/Keywords: inter-particle force; silica; non-aqueous; sedimentation; colloid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fotovati, M. (2011). Aggregation and sedimentation of fine solids in non-aqueous media. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/js956h33f

Chicago Manual of Style (16^th Edition):

Fotovati, Maryam. “Aggregation and sedimentation of fine solids in non-aqueous media.” 2011. Masters Thesis, University of Alberta. Accessed January 22, 2021. https://era.library.ualberta.ca/files/js956h33f.

MLA Handbook (7^th Edition):

Fotovati, Maryam. “Aggregation and sedimentation of fine solids in non-aqueous media.” 2011. Web. 22 Jan 2021.

Vancouver:

Fotovati M. Aggregation and sedimentation of fine solids in non-aqueous media. [Internet] [Masters thesis]. University of Alberta; 2011. [cited 2021 Jan 22]. Available from: https://era.library.ualberta.ca/files/js956h33f.

Council of Science Editors:

Fotovati M. Aggregation and sedimentation of fine solids in non-aqueous media. [Masters Thesis]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/js956h33f

Purdue University

6. Espinoza Chavez, Wilson Fernando. Laboratory characterization of2Q-ROK sand.

Degree: MSCE, Civil Engineering, 2016, Purdue University

URL: https://docs.lib.purdue.edu/open_access_theses/942

► A series of laboratory tests were performed in a sand commercially known as2Q-ROK to determine its response to loading. #2Q-ROK is a poorly-graded, clean… (more)

▼ A series of laboratory tests were performed in a sand commercially known as2Q-ROK to determine its response to loading. #2Q-ROK is a poorly-graded, clean silica sand composed of 99% of quartz (SiO2). Its specific gravity is 2.65 and its maximum and minimum void ratios are 1.03 and 0.7, respectively. In the absence of crushing, the #2Q-ROK sand direct shear critical-state friction angle is 32.8° and the ring shear critical-state friction angle is 29.6°. One-dimensional compression tests were performed on samples compressed to a normal stress of 24,851.36kPa for time periods ranging from 4 hours to 11 days. The maximum increment in relative breakage was 0.02. Time effects did not play a significant role in particle crushing of #2Q-ROK sand. The evolution of strength, particle gradation and morphology parameters with crushing were investigated by performing ring shear tests. The results of the ring shear tests showed that particle crushing increases significantly with shear displacement. Samples compressed to a normal stress of 300kPa and sheared for displacements ranging from 0.5m to 11.3m showed a maximum increase in relative breakage of 0.41. As crushing increased, the particle gradation of #2Q-ROK evolved from a poorly-graded sand to a more well-graded sand. Samples tested in the ring shear apparatus presented cycles of stress and vertical deformation, which indicated the occurrence of particle crushing. Each of these cycles started with a stage of contraction followed by a stage of dilation and a final stage of vertical displacement stabilization. As a result of the shear stress cycles observed with crushing, the mobilized friction angle of #2Q-ROK sand oscillated between 31° and 33°. Ring shear tests performed on samples compressed to normal stresses ranging from 50kPa to 100kPa and sheared to displacements ranging from 20m to 30m indicated that the friction angle increased by approximately 3° at large shear displacements. The fluctuation of friction angle that initially ranged from 31° to 33° started to increase at approximately 7m and 10m for the samples compressed to 100kPa and 50kPa, respectively. At the end of these tests the mobilized friction angle ranged from 33° to 36°. Ring shear tests also showed that particle crushing developed only in a shear zone whose thickness ranged from 4.4mm to 4.7mm (6.5 to 6.9 times the D50 of the original material). Considering a shear band thickness of 4.55mm, critical state was reached for the first time at a shear strain of 1648 % (75mm of shear displacement). As the gradation of #2Q-ROK sand evolved with shear displacement, its maximum and minimum void ratios decreased to 0.72 and 0.36, respectively (shear displacement of 11.3m). Sieve analyses combined with particle morphology analyses indicated that larger particles were likely to be crushed by shearing-off of their asperities, whereas small particles, by particle splitting. Advisors/Committee Members: Monica Prezzi, Monica Prezzi, Philippe Bourdeau, Rodrigo Salgado.

Subjects/Keywords: Applied sciences; Breakage parameters; Critical state; Friction angle; Particle crushing; Particle morphology; Silica sand; Civil Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Espinoza Chavez, W. F. (2016). Laboratory characterization of2Q-ROK sand. (Thesis). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_theses/942

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Espinoza Chavez, Wilson Fernando. “Laboratory characterization of2Q-ROK sand.” 2016. Thesis, Purdue University. Accessed January 22, 2021. https://docs.lib.purdue.edu/open_access_theses/942.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Espinoza Chavez, Wilson Fernando. “Laboratory characterization of2Q-ROK sand.” 2016. Web. 22 Jan 2021.

Vancouver:

Espinoza Chavez WF. Laboratory characterization of2Q-ROK sand. [Internet] [Thesis]. Purdue University; 2016. [cited 2021 Jan 22]. Available from: https://docs.lib.purdue.edu/open_access_theses/942.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Espinoza Chavez WF. Laboratory characterization of2Q-ROK sand. [Thesis]. Purdue University; 2016. Available from: https://docs.lib.purdue.edu/open_access_theses/942

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

7. Smith, Benjamin David. The Self- and Directed Assembly of Nanowires.

Degree: 2013, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16506

► This thesis explores the self- and directed assembly of nanowires. Specifically, we examine the driving forces behind nanowire self-assembly and the macro-structures that are formed.… (more)

▼ This thesis explores the self- and directed assembly of nanowires. Specifically, we examine the driving forces behind nanowire self-assembly and the macro-structures that are formed. Particle-dense, oriented nanowire structures show promise in the fields of photonics, energy, and electronics. Arrays of spherical particles have already found uses in electronic inks, sensing arrays, and many other commercial applications; but, it is a challenge to create specific arrays of morphologically and/or compositionally anisotropic particles. The following chapters illuminate the interactions that drive the assembly of anisotropic particles in high density solutions in the absence of applied fields or solution drying. Special emphasis is placed on the structures that are formed. The properties of micro- and nanoparticles and their assembly are introduced in Chapter 1. We began our studies by examining the assembly of single component nanowires. Chapter 2 describes this work, in which solid Au nanowires measuring 2-7 µm in length and 290 nm in diameter self-assembled into smectic rows. To increase the particle and array complexity, two-component, metallic nanowire assembly was explored in Chapter 3. n an attempt to obtain better ordering within rows, silica coated nanowires with partial Au cores were made. The synthesis involved silica-coating the nanowires and selectively etching a Ag segment. These particles have extremely different VDWs attractions between their segments, as the Au cores are much more attractive than the solvent-filled etched ends. The assembly of these partially etched nanowires (PENs) is detailed in Chapters 4, 5, and 6. The semi-automated counting of PENs in images by software is used heavily in Chapters 4 and 5. Appendix A describes the use, development, and validation of macros within Image-Pro. Chapter 7 examines the overall conclusions and future directions for this research. By combining our assembly techniques with known directing forces (e.g., electric or magnetic fields) more specific alignment and/or positioning could be achieved. We have also begun to explore directing assembly through lithographic microwells. Further work needs to explore the integration of arrays into devices and the use of functional materials. Then, high density, oriented arrays could be created for photonic, energy, sensing, catalytic, and electronic applications. Advisors/Committee Members: Christine Dolan Keating, Dissertation Advisor/Co-Advisor, Dr Mary Beth Williams, Committee Member, Thomas E Mallouk, Committee Member, Kristen Ann Fichthorn, Committee Member.

Subjects/Keywords: Nanowires; Nanotubes; Gold; Silica; Self-Assembly; Sedimentation; van der Waals; Aspect Ratio; Density; Electrostatics; Particle

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APA (6^th Edition):

Smith, B. D. (2013). The Self- and Directed Assembly of Nanowires. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16506

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smith, Benjamin David. “The Self- and Directed Assembly of Nanowires.” 2013. Thesis, Penn State University. Accessed January 22, 2021. https://submit-etda.libraries.psu.edu/catalog/16506.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smith, Benjamin David. “The Self- and Directed Assembly of Nanowires.” 2013. Web. 22 Jan 2021.

Vancouver:

Smith BD. The Self- and Directed Assembly of Nanowires. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Jan 22]. Available from: https://submit-etda.libraries.psu.edu/catalog/16506.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smith BD. The Self- and Directed Assembly of Nanowires. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/16506

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Western Ontario

8. Seyedmehdi, Seyed Amirhossein. Functional Coatings: Superhydrophopbic And Conductive Coatings.

Degree: 2011, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/178

► The natural world has many superhydrophobic and self-cleaning surfaces such as butterfly wings and lotus plant leaves, both well known examples of self-cleaning surfaces. Water… (more)

▼ The natural world has many superhydrophobic and self-cleaning surfaces such as butterfly wings and lotus plant leaves, both well known examples of self-cleaning surfaces. Water droplets on these surfaces can pick up dirt particles and remove contamination. The significant self-cleaning ability of these surfaces has inspired many researchers to attempt to fabricate these superhydrophobic coatings, mimicking their self-cleaning properties, using different methods. Most of the superhydrophobic coatings described in current literature need to be cured in ovens and thus difficult to be applied and/or be maintained in the work place. Therefore, there is a need to develop room temperature curing superhydrophobic coatings using simple and inexpensive processes. This study demonstrates the fabrication of room temperature superhydrophobic coatings by using RTV (Room Temperature Vulcanizing) silicone rubber and fluoropolyurethane polymers. Also the effects of various parameters such as resin and solvent type, additives, coatings thickness and production methods, on the properties of superhydrophobic coatings, were evaluated. The final coatings showed contact angles higher than 145º and good UV and water durability. In addition, the superhydrophobic RTV silicone rubber coatings passed the erosion and track resistance test, a major test for high voltage insulator coatings in the industry.Conductive coatings are used in a variety of applications such as antistatic surfaces, electromagnetic interference shielding (EMI) and sensors. Despite previous research, most conductive coatings in the market that have high conductivity are made from metallic conductive fillers that are expensive and need to be compounded with polymers in high concentrations. Also, conductive mesh coatings used in the market require a complex process and should be prepared with some different processing steps. This project focuses on conductive coatings and mesh coatings that show good conductivity and have low cost. The results indicated that nano clay could improve the electrical and mechanical properties of conductive coatings. Also, conductive mesh coatings prepared by emulsion method could be a good candidate to make simple and cheap mesh coatings for electromagnetic shielding.

Subjects/Keywords: Superhydrophobic coatings; RTV silicone rubber; fluoropolyurethane; conductive coatings; nano silica; ultrafine fluoric particle; Polymer Science

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APA (6^th Edition):

Seyedmehdi, S. A. (2011). Functional Coatings: Superhydrophopbic And Conductive Coatings. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/178

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Seyedmehdi, Seyed Amirhossein. “Functional Coatings: Superhydrophopbic And Conductive Coatings.” 2011. Thesis, University of Western Ontario. Accessed January 22, 2021. https://ir.lib.uwo.ca/etd/178.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Seyedmehdi, Seyed Amirhossein. “Functional Coatings: Superhydrophopbic And Conductive Coatings.” 2011. Web. 22 Jan 2021.

Vancouver:

Seyedmehdi SA. Functional Coatings: Superhydrophopbic And Conductive Coatings. [Internet] [Thesis]. University of Western Ontario; 2011. [cited 2021 Jan 22]. Available from: https://ir.lib.uwo.ca/etd/178.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Seyedmehdi SA. Functional Coatings: Superhydrophopbic And Conductive Coatings. [Thesis]. University of Western Ontario; 2011. Available from: https://ir.lib.uwo.ca/etd/178

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

9. Pinnaratip, Rattapol. STUDY OF SILICA NANOPARTICLE COMPOSITE ON SILICA-HYDROGEN PEROXIDE COMPLEXATIONS AND THEIR EFFECTS IN CATECHOL BASED ADHESIVES.

Degree: PhD, Department of Biomedical Engineering, 2020, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/1044

► Mussel adhesive proteins contain catechol moiety, which allows the protein to crosslinked, solidify, and adhere to surrounding surfaces even under wet conditions. Incorporating the… (more)

Subjects/Keywords: Silica Particle; Wound Healing; Controlled Release; Catechol Adhesive; Hydrogen Peroxide; Composite Adhesive; Biomaterials

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APA (6^th Edition):

Pinnaratip, R. (2020). STUDY OF SILICA NANOPARTICLE COMPOSITE ON SILICA-HYDROGEN PEROXIDE COMPLEXATIONS AND THEIR EFFECTS IN CATECHOL BASED ADHESIVES. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/1044

Chicago Manual of Style (16^th Edition):

Pinnaratip, Rattapol. “STUDY OF SILICA NANOPARTICLE COMPOSITE ON SILICA-HYDROGEN PEROXIDE COMPLEXATIONS AND THEIR EFFECTS IN CATECHOL BASED ADHESIVES.” 2020. Doctoral Dissertation, Michigan Technological University. Accessed January 22, 2021. https://digitalcommons.mtu.edu/etdr/1044.

MLA Handbook (7^th Edition):

Pinnaratip, Rattapol. “STUDY OF SILICA NANOPARTICLE COMPOSITE ON SILICA-HYDROGEN PEROXIDE COMPLEXATIONS AND THEIR EFFECTS IN CATECHOL BASED ADHESIVES.” 2020. Web. 22 Jan 2021.

Vancouver:

Pinnaratip R. STUDY OF SILICA NANOPARTICLE COMPOSITE ON SILICA-HYDROGEN PEROXIDE COMPLEXATIONS AND THEIR EFFECTS IN CATECHOL BASED ADHESIVES. [Internet] [Doctoral dissertation]. Michigan Technological University; 2020. [cited 2021 Jan 22]. Available from: https://digitalcommons.mtu.edu/etdr/1044.

Council of Science Editors:

Pinnaratip R. STUDY OF SILICA NANOPARTICLE COMPOSITE ON SILICA-HYDROGEN PEROXIDE COMPLEXATIONS AND THEIR EFFECTS IN CATECHOL BASED ADHESIVES. [Doctoral Dissertation]. Michigan Technological University; 2020. Available from: https://digitalcommons.mtu.edu/etdr/1044

University of Newcastle

10. Seyfaee, Ahmad. Experimental and theoretical analysis of polyethyleneimine-silica particle formation.

Degree: PhD, 2017, University of Newcastle

URL: http://hdl.handle.net/1959.13/1337756

►

Research Doctorate - Doctor of Philosophy (PhD)

Silica particles are used in many applications from engineering such as catalysis and coatings, to medical sciences such… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

Silica particles are used in many applications from engineering such as catalysis and coatings, to medical sciences such as drug delivery. Although silica sources can be found naturally, they are impure and lack desirable functionalities. To overcome the aforementioned disadvantages, the synthesis of silica particles via liquid phase techniques has become more popular. However, it has been shown that it is more beneficial to use less harsh chemicals such as trimethoxymethylsilane (TMOMS) as the silica precursor and polyethyleneimine (PEI) as the catalyst in a phosphate buffer (PB) solution, to form PEI-silica particles. Compared to the conventional Stöber method, these particles are formed more quickly in a less toxic environment. This method produces hydrophobic particles whose surface charge is positive over a wide range of pH. A positive surface charge and/or hydrophobicity generally enhances the selectivity of the PEI-silica particles, which makes the PEI-silica particles good candidates in targeted separation processes. This thesis focuses on the basics of the formation of PEI-silica particles and their characteristics. Scanning electron microscopy (SEM), dynamic light scattering (DLS), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), zeta potential, viscometry and gravimetry measurements, as well as time-lapse photography were used for characterisation. First, a general mechanism for the formation of PEI-silica particles was proposed. Three regions in the formation of silica particles were observed: nucleation, growth and equilibrium. The results showed that when particle synthesis was carried out in phosphate buffer solutions some of the PB molecules were likely to be associated with PEI and formed PEI/PB nuclei. Then, these nuclei grew into small particles called “primary particles”, which then aggregated and formed larger PEI-silica particles. In this work, the extent of each region as well as the final particle size were shown to be a function of TMOMS and PEI concentration. By developing a new semi-empirical equation using mass balance and reaction rate equations, the growth and equilibrium regions of PEI-silica particle formation were successfully modelled. In fact, by assuming the existence of different particle generations the peaks and trough in the DLS data were successfully modelled. Having studied the growth and equilibrium, the nucleation region still needed to be further investigated. In the investigation on the nuclei properties, it was found that when PB was not present, silica gel formed instead of particles at pH 10-11. In addition, when PEI was highly charged (pH below 9) there was no visible reaction suggesting silication did not occur. Finally, the effect of mixing on PEI-silica particles was probed. Three modes of mixing were considered: no mixing, mixing by sonication and mixing by magnetic stirring. The results show that the final particle size and their distribution were affected by the mixing modes and…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: polyethyleneimine-silica particle; polyethyleneimine (PEI); silica precursor; trimethoxymethylsilane (TMOMS); thesis by publication; particle formation mechanism; catalyst; semi-emperical modeling; particle synthesis; viscosity of polyethyleneimine solution; scanning electron microscopy (SEM); dynamic light scattering (DLS); polymer

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APA (6^th Edition):

Seyfaee, A. (2017). Experimental and theoretical analysis of polyethyleneimine-silica particle formation. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1337756

Chicago Manual of Style (16^th Edition):

Seyfaee, Ahmad. “Experimental and theoretical analysis of polyethyleneimine-silica particle formation.” 2017. Doctoral Dissertation, University of Newcastle. Accessed January 22, 2021. http://hdl.handle.net/1959.13/1337756.

MLA Handbook (7^th Edition):

Seyfaee, Ahmad. “Experimental and theoretical analysis of polyethyleneimine-silica particle formation.” 2017. Web. 22 Jan 2021.

Vancouver:

Seyfaee A. Experimental and theoretical analysis of polyethyleneimine-silica particle formation. [Internet] [Doctoral dissertation]. University of Newcastle; 2017. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1959.13/1337756.

Council of Science Editors:

Seyfaee A. Experimental and theoretical analysis of polyethyleneimine-silica particle formation. [Doctoral Dissertation]. University of Newcastle; 2017. Available from: http://hdl.handle.net/1959.13/1337756

Indian Institute of Science

11. Saluja, Gaurav. Experimental Study of Patterns in Hydrodynamically Deposited Dispersed Phase of CaCO3 on Surfaces of Straight Cylindrica Silica Tubing.

Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3955

► Deposition of dispersed phase from ﬂowing dispersions onto a substrate surface is of utmost relevance for various industrial processes like fouling of sparingly soluble salts,… (more)

▼ Deposition of dispersed phase from ﬂowing dispersions onto a substrate surface is of utmost relevance for various industrial processes like fouling of sparingly soluble salts, such as CaCO3 and CaSO4 in heat exchangers and desalination evaporators which tend to form deposits on ﬂow surfaces of tubes or pipelines conveying hard water and in water ﬁltration and puriﬁcation processes since concentration of CaCO3 in many natural water resources is equal to or greater than the saturation level. The study of deposition is also of intrinsic interest for biophysics and colloid science where vascular calciﬁcation i.e. precipitation and deposition of calcium phosphates (hydroxyapatites) in the muscular layer of the blood reduces arterial compliance and promotes congestive heart failure. Experiments were conducted on straight, circular cross section silica tubing of inner di-ameter (ranging from 0.88 mm to3.40 mm) to study the effect of electrostatic interaction and hydrodynamics on the deposition behavior of CaCO3 on silica surface when streams of aqueous solutions of Ca(NO3)2 and Na2CO3 with a concentration of 40.0 g l−1 and 25.9gl−1 respectively ﬂowing at a volumetric ﬂow rate of 1 l h−1 each is mixed to form CaCO3 dispersion which was then transported through silica tubing at a steady volumetric ﬂow rate of 2lh−1. The in situ phenomenology of CaCO3 particles transport, deposition, and evolution of spatial and temporal patterns of the CaCO3 deposition on the silica surface along with the dendritic growth of CaCO3 during the ﬂow was visually documented with the aid of a 100X optical microscope. The study discussed the deposition behavior of dispersed phase of CaCO3 from its aqueous dispersion on the silica tubing during ﬂow and attributed charge inversion from negative to positive of silica surface, due to the adsorption of Na+ formed during precipitation reaction of CaCO3, as a plausible reason for the reversal of electrostatic interaction from attraction between initially negatively charged silica surface and positively charged CaCO3 particles which promoted deposition and subsequent evolution of patterns of CaCO3 deposition on the silica surface during the early stage of experiments to repulsion between ﬁnally net positively charged silica surface and positively charged CaCO3 particles which resulted in retarded deposition and subsequent emergence of sparsely adhered CaCO3 agglomerates as localized, limited patches of CaCO3 deposits on the silica surface during the later stage of the experiments Advisors/Committee Members: Arakeri, Jaywant H (advisor).

Subjects/Keywords: Calcium Carbonates (CaCo3); Substrates Surfaces; Water Surface-particle Interaction; Calcium Crystallization, polymorphic transformation; Calcium Water; CaSO4; CaCO3 - Silica Surface; Mechanical Engineering

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APA (6^th Edition):

Saluja, G. (2018). Experimental Study of Patterns in Hydrodynamically Deposited Dispersed Phase of CaCO3 on Surfaces of Straight Cylindrica Silica Tubing. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3955

Chicago Manual of Style (16^th Edition):

Saluja, Gaurav. “Experimental Study of Patterns in Hydrodynamically Deposited Dispersed Phase of CaCO3 on Surfaces of Straight Cylindrica Silica Tubing.” 2018. Masters Thesis, Indian Institute of Science. Accessed January 22, 2021. http://etd.iisc.ac.in/handle/2005/3955.

MLA Handbook (7^th Edition):

Saluja, Gaurav. “Experimental Study of Patterns in Hydrodynamically Deposited Dispersed Phase of CaCO3 on Surfaces of Straight Cylindrica Silica Tubing.” 2018. Web. 22 Jan 2021.

Vancouver:

Saluja G. Experimental Study of Patterns in Hydrodynamically Deposited Dispersed Phase of CaCO3 on Surfaces of Straight Cylindrica Silica Tubing. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Jan 22]. Available from: http://etd.iisc.ac.in/handle/2005/3955.

Council of Science Editors:

Saluja G. Experimental Study of Patterns in Hydrodynamically Deposited Dispersed Phase of CaCO3 on Surfaces of Straight Cylindrica Silica Tubing. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3955

University of Cambridge

12. Henderson, Cassi Joanna. Biosensor design utilizing particle-bound enzymes.

Degree: PhD, 2020, University of Cambridge

► There is a clear need for affordable point-of-care diagnostics, especially in vulnerable low- and middle-income countries where access to laboratory-based testing is limited. This thesis… (more)

▼ There is a clear need for affordable point-of-care diagnostics, especially in vulnerable low- and middle-income countries where access to laboratory-based testing is limited. This thesis explores whether recombinant protein technology in combination with a low-cost support matrix could provide a basis for an inexpensive, simple, and robust production process for the bio-sensing element of a diagnostic that would be amenable to manufacture in resource constrained settings. Silica was selected as the solid support for this work, given its biocompatibility and wide-availability (including extraction from natural sources, like sand, as demonstrated here). By employing an affinity binding sequence for silica in fusion with the central assay reagent protein targeting the analyte, simultaneous isolation and immobilisation onto silica carrier particles was achieved directly from lysate. In addition, the incorporation of a coloured fluorescent protein in the fusion enabled the protein production and immobilisation to be followed visually without significant laboratory equipment. Diagnostic sensing activity was retained in the immobilised fusion proteins, even over two months at 20-22 ⁰C in a dried state. A comparable limit of detection was achieved with immobilised reagents as with the soluble form. Taken together with the reduced downstream processing attained by a one-step purification and immobilisation approach, this supports the use of particle-bound reagents in the development of point-of-care tests. To make use of the particle-bound reagents, a novel falling particle biosensor design was explored in this thesis, where the sedimentation of the silica particles was used to drive mixing in an otherwise stationary fluid compartment. The performance of this design was compared against two other formats commonly employed with bio-functionalised particles – (A) a simple suspension in a microcentrifuge tube and (B) a packed bed in a microfluidic channel. The falling particle device outperformed both formats. Overall, this work has demonstrated that the integrated functionality of the fusion proteins could facilitate a production pathway from raw material to end diagnostic, highlighting the use of silica as a protein carrier and presenting a novel biosensor format for utilizing particle-bound enzymes.

Subjects/Keywords: biosensors; protein engineering; protein immobilisation; point-of-care diagnostics; global health; silica; sarcosine; enzymes; particle sedimentation

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APA (6^th Edition):

Henderson, C. J. (2020). Biosensor design utilizing particle-bound enzymes. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/297857https://www.repository.cam.ac.uk/bitstream/1810/297857/2/SCextract_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/3/SCextract_narrow_flip_long.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/4/SCextract_narrow_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/5/SCextract_parallel_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/6/SCextract_parallel_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/7/SCextract_standard_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/8/SCextract_standard_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/9/Si60_6-35_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/10/Si60_40-63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/11/Si60_63-210_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/12/Si60_200-500_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/13/Si60_less63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/14/SiNPs_narrow_flip_1.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/15/SiNPs_narrow_flip_2.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/16/SiNPs%2bLGparticles_narrow_flip.mp4

Chicago Manual of Style (16^th Edition):

Henderson, Cassi Joanna. “Biosensor design utilizing particle-bound enzymes.” 2020. Doctoral Dissertation, University of Cambridge. Accessed January 22, 2021. https://www.repository.cam.ac.uk/handle/1810/297857https://www.repository.cam.ac.uk/bitstream/1810/297857/2/SCextract_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/3/SCextract_narrow_flip_long.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/4/SCextract_narrow_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/5/SCextract_parallel_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/6/SCextract_parallel_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/7/SCextract_standard_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/8/SCextract_standard_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/9/Si60_6-35_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/10/Si60_40-63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/11/Si60_63-210_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/12/Si60_200-500_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/13/Si60_less63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/14/SiNPs_narrow_flip_1.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/15/SiNPs_narrow_flip_2.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/16/SiNPs%2bLGparticles_narrow_flip.mp4.

MLA Handbook (7^th Edition):

Henderson, Cassi Joanna. “Biosensor design utilizing particle-bound enzymes.” 2020. Web. 22 Jan 2021.

Vancouver:

Henderson CJ. Biosensor design utilizing particle-bound enzymes. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Jan 22]. Available from: https://www.repository.cam.ac.uk/handle/1810/297857https://www.repository.cam.ac.uk/bitstream/1810/297857/2/SCextract_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/3/SCextract_narrow_flip_long.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/4/SCextract_narrow_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/5/SCextract_parallel_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/6/SCextract_parallel_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/7/SCextract_standard_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/8/SCextract_standard_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/9/Si60_6-35_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/10/Si60_40-63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/11/Si60_63-210_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/12/Si60_200-500_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/13/Si60_less63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/14/SiNPs_narrow_flip_1.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/15/SiNPs_narrow_flip_2.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/16/SiNPs%2bLGparticles_narrow_flip.mp4.

Council of Science Editors:

Henderson CJ. Biosensor design utilizing particle-bound enzymes. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/297857https://www.repository.cam.ac.uk/bitstream/1810/297857/2/SCextract_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/3/SCextract_narrow_flip_long.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/4/SCextract_narrow_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/5/SCextract_parallel_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/6/SCextract_parallel_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/7/SCextract_standard_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/8/SCextract_standard_tilt.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/9/Si60_6-35_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/10/Si60_40-63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/11/Si60_63-210_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/12/Si60_200-500_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/13/Si60_less63_narrow_flip.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/14/SiNPs_narrow_flip_1.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/15/SiNPs_narrow_flip_2.mp4 ; https://www.repository.cam.ac.uk/bitstream/1810/297857/16/SiNPs%2bLGparticles_narrow_flip.mp4

Freie Universität Berlin

13. Langer, Carolin Marie. Functionalizable silica-based micron-sized iron oxide particles for cellular magnetic resonance imaging.

Degree: 2014, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-9036

► Introduction: Cellular therapies require methods for noninvasive visualization of transplanted cells. Micron-sized iron oxide particles (MPIO) generate a strong contrast in magnetic resonance imaging (MRI)… (more)

Subjects/Keywords: iron oxide particle; MRI; cellular labeling; intracellular contrast agent; Silica; 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit

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APA (6^th Edition):

Langer, C. M. (2014). Functionalizable silica-based micron-sized iron oxide particles for cellular magnetic resonance imaging. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-9036

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Langer, Carolin Marie. “Functionalizable silica-based micron-sized iron oxide particles for cellular magnetic resonance imaging.” 2014. Thesis, Freie Universität Berlin. Accessed January 22, 2021. http://dx.doi.org/10.17169/refubium-9036.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Langer, Carolin Marie. “Functionalizable silica-based micron-sized iron oxide particles for cellular magnetic resonance imaging.” 2014. Web. 22 Jan 2021.

Vancouver:

Langer CM. Functionalizable silica-based micron-sized iron oxide particles for cellular magnetic resonance imaging. [Internet] [Thesis]. Freie Universität Berlin; 2014. [cited 2021 Jan 22]. Available from: http://dx.doi.org/10.17169/refubium-9036.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Langer CM. Functionalizable silica-based micron-sized iron oxide particles for cellular magnetic resonance imaging. [Thesis]. Freie Universität Berlin; 2014. Available from: http://dx.doi.org/10.17169/refubium-9036

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. DENISE NG ZI LING. COLLOID-MEDIATED MICROFLUIDIC EMULSION-BASED CRYSTALLIZATION.

Degree: 2020, National University of Singapore

URL: https://scholarbank.nus.edu.sg/handle/10635/182560

Subjects/Keywords: particle engineering; crystallization; microfluidic emulsions; colloidal silica; pharmaceutical formulation

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APA (6^th Edition):

LING, D. N. Z. (2020). COLLOID-MEDIATED MICROFLUIDIC EMULSION-BASED CRYSTALLIZATION. (Thesis). National University of Singapore. Retrieved from https://scholarbank.nus.edu.sg/handle/10635/182560

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

LING, DENISE NG ZI. “COLLOID-MEDIATED MICROFLUIDIC EMULSION-BASED CRYSTALLIZATION.” 2020. Thesis, National University of Singapore. Accessed January 22, 2021. https://scholarbank.nus.edu.sg/handle/10635/182560.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

LING, DENISE NG ZI. “COLLOID-MEDIATED MICROFLUIDIC EMULSION-BASED CRYSTALLIZATION.” 2020. Web. 22 Jan 2021.

Vancouver:

LING DNZ. COLLOID-MEDIATED MICROFLUIDIC EMULSION-BASED CRYSTALLIZATION. [Internet] [Thesis]. National University of Singapore; 2020. [cited 2021 Jan 22]. Available from: https://scholarbank.nus.edu.sg/handle/10635/182560.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

LING DNZ. COLLOID-MEDIATED MICROFLUIDIC EMULSION-BASED CRYSTALLIZATION. [Thesis]. National University of Singapore; 2020. Available from: https://scholarbank.nus.edu.sg/handle/10635/182560

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Yin, Yang. Development of π-Conjugated Carbon Molecules Grafted Silica Nano-particles Composite Materials : π共役炭素分子をグラフトしたシリカナノコンポジット材料の開発に関する研究.

Degree: 博士（工学）, 2017, Kyushu Institute of Technology / 九州工業大学

URL: http://hdl.handle.net/10228/5599

九州工業大学博士学位論文学位記番号：工博甲第399号学位授与年月日：平成27年9月25日

平成27年度

Advisors/Committee Members: 横野, 照尚.

Subjects/Keywords: π-conjugated; Carbon Molecules grafted; Composite Materials; Silica Nano-particle

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APA (6^th Edition):

Yin, Y. (2017). Development of π-Conjugated Carbon Molecules Grafted Silica Nano-particles Composite Materials : π共役炭素分子をグラフトしたシリカナノコンポジット材料の開発に関する研究. (Thesis). Kyushu Institute of Technology / 九州工業大学. Retrieved from http://hdl.handle.net/10228/5599

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yin, Yang. “Development of π-Conjugated Carbon Molecules Grafted Silica Nano-particles Composite Materials : π共役炭素分子をグラフトしたシリカナノコンポジット材料の開発に関する研究.” 2017. Thesis, Kyushu Institute of Technology / 九州工業大学. Accessed January 22, 2021. http://hdl.handle.net/10228/5599.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yin, Yang. “Development of π-Conjugated Carbon Molecules Grafted Silica Nano-particles Composite Materials : π共役炭素分子をグラフトしたシリカナノコンポジット材料の開発に関する研究.” 2017. Web. 22 Jan 2021.

Vancouver:

Yin Y. Development of π-Conjugated Carbon Molecules Grafted Silica Nano-particles Composite Materials : π共役炭素分子をグラフトしたシリカナノコンポジット材料の開発に関する研究. [Internet] [Thesis]. Kyushu Institute of Technology / 九州工業大学; 2017. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10228/5599.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yin Y. Development of π-Conjugated Carbon Molecules Grafted Silica Nano-particles Composite Materials : π共役炭素分子をグラフトしたシリカナノコンポジット材料の開発に関する研究. [Thesis]. Kyushu Institute of Technology / 九州工業大学; 2017. Available from: http://hdl.handle.net/10228/5599

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Rochester Institute of Technology

16. Jalindre, Swaraj. To Investigate the absorption, dynamic contact angle and printability effects of synthetic zeolite pigments in an inkjet receptive coating.

Degree: School of Print Media (CIAS), 2011, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/6949

► Ink absorption performance in inkjet receptive coatings containing synthetic zeolite pigments was studied. Coating pigment pore and particle size distribution are the key parameters that… (more)

▼ Ink absorption performance in inkjet receptive coatings containing synthetic zeolite pigments was studied. Coating pigment pore and particle size distribution are the key parameters that influence in modifying media surface properties, thus affecting the rate of ink penetration and drying time (Schölkopf, et al. 2004). The primary objective of this study was: (1) to investigate the synthetic zeolite pigment effects on inkjet ink absorption, dynamic contact angle and printability, and (2) to evaluate these novel synthetic zeolite pigments in replacing the fumed silica pigments in conventional inkjet receptive coatings. In this research study, single pigment coating formulations (in equal P:B ratio) were prepared using microporous synthetic zeolite pigments (5A, Organophilic and 13X) and polyvinyl alcohol (PVOH) binder. The laboratory-coated samples were characterized for absorption, air permeance, roughness, drying time, wettability and print fidelity. Based on the rheological data, it was found that the synthetic zeolite formulated coatings depicted a Newtonian flow behavior at low shear; while the industry accepted fumed silica based coatings displayed a characteristically high pseudoplastic flow behavior. Our coated samples generated using microporous synthetic zeolite pigments produced low absorption, reduced wettability and accelerated ink drying characteristics. These characteristics were caused due to the synthetic zeolite pigments, which resulted in relatively closed surface structure coated samples. The research suggested that no single selected synthetic zeolite coating performed better than the conventional fumed silica based coatings. Experimental data also showed that there was no apparent relationship between synthetic zeolite pigment pore sizes and inkjet ink absorption. For future research, above coated samples should be evaluated for pore size distribution using Mercury Porosimeter, which quantifies surface porosity of coated samples. This presented approach can be easily used for investigating other such microporous coating pigments in formulating inkjet receptive coating. The research findings will benefit the coating formulators, engineers and material science students, in understanding the absorption characteristics of selected synthetic zeolite pigments thereby encouraging them in identifying other such alternative pigments in conventional inkjet receptive coatings. Advisors/Committee Members: Vogl, Howard.

Subjects/Keywords: Characterization and testing; Coating rheology; Conventional fumed silica based coating pigment; Inkjet receptive coatings; Pigment pore and particle size; Synthetic Zeolite pigments

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APA (6^th Edition):

Jalindre, S. (2011). To Investigate the absorption, dynamic contact angle and printability effects of synthetic zeolite pigments in an inkjet receptive coating. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/6949

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jalindre, Swaraj. “To Investigate the absorption, dynamic contact angle and printability effects of synthetic zeolite pigments in an inkjet receptive coating.” 2011. Thesis, Rochester Institute of Technology. Accessed January 22, 2021. https://scholarworks.rit.edu/theses/6949.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jalindre, Swaraj. “To Investigate the absorption, dynamic contact angle and printability effects of synthetic zeolite pigments in an inkjet receptive coating.” 2011. Web. 22 Jan 2021.

Vancouver:

Jalindre S. To Investigate the absorption, dynamic contact angle and printability effects of synthetic zeolite pigments in an inkjet receptive coating. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Jan 22]. Available from: https://scholarworks.rit.edu/theses/6949.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jalindre S. To Investigate the absorption, dynamic contact angle and printability effects of synthetic zeolite pigments in an inkjet receptive coating. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/6949

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Newcastle

17. Hyde, Emily Dawn Elizabeth Rodd. Fabrication of functionalised biomimetic silica shell – magnetic core particles and their applications in heavy metal ion and fine mineral particle recovery.

Degree: PhD, 2018, University of Newcastle

URL: http://hdl.handle.net/1959.13/1386320

►

Research Doctorate - Doctor of Philosophy (PhD)

In our energy conscious world, magnetic separation provides a facile, low energy technique offering low operating costs, high… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

In our energy conscious world, magnetic separation provides a facile, low energy technique offering low operating costs, high yield and ease of operation. For nonmagnetic materials, their specific adsorption onto magnetic carrier particles allows those materials to be separated via the application of magnetic fields. Magnetic core – silica shell particles are ideally posed as magnetic carrier particles combining the magnetism offered by the core with an easily functionalised silica shell which provides adsorption selectivity. However, the fabrication of magnetic core-shell carrier particles reported in the literature often involve high temperatures, long reaction times, harsh reaction conditions and/or complex, multi-step methodologies, and, therefore, prove difficult to effectively scale up. Biomimetic silication, utilising the branched, polyamine, polyethyleneimine (PEI), as a scaffolding/silication directing molecule, was identified as a promising avenue for silica shell fabrication. In addition, a novel facile method of silica particle synthesis (NaOH-silica synthesis), requiring only two reactants, trimethoxymethylsilane (TMOMS) and sodium hydroxide (NaOH), was developed and characterised in this work. Functionalisation of the silica shell material is vital to achieve selective adsorption. The PEI-directed silication method, focused on in this work, introduces intrinsic amine (for PEI-silica) and amine/thiol functionalisations (for PEI-thiol silica) with the silane reactants, TMOMS and 3-mercaptopropyltrimethoxysilane (3mPTMOS), respectively. Control of the surface charge of NaOH-silica particles was achieved via the rapid electrostatic adsorption and acidic desorption of the PEI. In addition, a technique for the more permanent, covalent surface modification of the PEI-thiol silica particles utilised the thiol surface groups to covalently attach various surface modifiers to the particle surface. Successful surface modification was confirmed by Fourier transfer infrared (FTIR) spectroscopy and zeta potential measurements. The results from these studies convey rapid, reliable techniques for reversible and irreversible silica surface functionalisation. PEI-silica particle synthesis was adapted for coating micron-sized magnetic carbonyl iron cores, to develop the magnetic core-shell carrier particles. The PEI-silica coated carbonyl iron particles were characterized via scanning electron microscopy (SEM), energy dispersive x-ray (EDX) spectroscopy and FTIR spectroscopy. Varying the fabrication method and silane concentration successfully tuned the shell characteristics. Methods using sonication produced smooth, more evenly distributed coatings with a tendency towards multicore particles. In contrast, raspberry-like coatings were produced via slow reactant addition, one- and two-pot methods. The PEI-silica coating methodology was scaled up by factors of 10 and 50 to investigate the effect of increased reaction size on the core-shell particles produced. The scaled…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: core-shell particles; magnetic separation; biomimetic silica synthesis; polyethylenimine; heavy metal ion removal; fine mineral particle separation; surface modification; thesis by publication

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APA (6^th Edition):

Hyde, E. D. E. R. (2018). Fabrication of functionalised biomimetic silica shell – magnetic core particles and their applications in heavy metal ion and fine mineral particle recovery. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1386320

Chicago Manual of Style (16^th Edition):

Hyde, Emily Dawn Elizabeth Rodd. “Fabrication of functionalised biomimetic silica shell – magnetic core particles and their applications in heavy metal ion and fine mineral particle recovery.” 2018. Doctoral Dissertation, University of Newcastle. Accessed January 22, 2021. http://hdl.handle.net/1959.13/1386320.

MLA Handbook (7^th Edition):

Hyde, Emily Dawn Elizabeth Rodd. “Fabrication of functionalised biomimetic silica shell – magnetic core particles and their applications in heavy metal ion and fine mineral particle recovery.” 2018. Web. 22 Jan 2021.

Vancouver:

Hyde EDER. Fabrication of functionalised biomimetic silica shell – magnetic core particles and their applications in heavy metal ion and fine mineral particle recovery. [Internet] [Doctoral dissertation]. University of Newcastle; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1959.13/1386320.

Council of Science Editors:

Hyde EDER. Fabrication of functionalised biomimetic silica shell – magnetic core particles and their applications in heavy metal ion and fine mineral particle recovery. [Doctoral Dissertation]. University of Newcastle; 2018. Available from: http://hdl.handle.net/1959.13/1386320

Iowa State University

18. Huang, Wei. Functionalized mesoporous silica nanoparticles (MSNs) for applications in drug delivery and catalysis.

Degree: 2010, Iowa State University

URL: https://lib.dr.iastate.edu/etd/11680

► Well-ordered mesoporous silica nanoparticles (MSNs) feature a great number of important characteristics including large surface area and pore volume, tunable pore diameter, uniform particle size,… (more)

▼ Well-ordered mesoporous silica nanoparticles (MSNs) feature a great number of important characteristics including large surface area and pore volume, tunable pore diameter, uniform particle size, and good biocompatibility. The feasibility of selective functionalization on the exterior and interior surface of MSNs makes them applicable in areas as diverse as sorption, separation, sensing, drug delivery, and catalysis. Poly(L-lysine) was immobilized onto the outer surface of amine functionalized MSN via ring-opening polymerization. The poly(L-lysine) coated MSN (PLL-MSN) could be internalized by human cervical cancer (HeLa) cells with extremely high efficiency, which made the delivery of a large amount of drugs into cells possible. The release of the drugs was regulated by the degradation of poly(L-lysine). Trypsin, an enzyme abundant in the intestine where most molecules are absorbed by human body, could digest poly(L-lysine) and open the pore channels of PLL-MSN. On the other hand, pepsin, an enzyme that accumulates in the stomach, had no impact on poly(L-lysine) and therefore the loaded drugs could be kept inside the pore channels and protected from acid-induced hydrolysis. We envision that PLL-MSN has great potential as an oral drug delivery vehicle. MSNs were also used as catalyst supports in cellulose degradation reactions. We have synthesized a series of platinum nanoparticle immobilized mesoporous silica nanoparticles (Pt NP-MSNs) by using N-(2-aminoethyl)-3-aminopropyl (AAP) and 3-[2-(2-aminoethylamino)ethylamino]propyl (AEP) functionalized MSNs as solid supports. Platinum nanoparticles were anchored on the MSNs by complexation between the Pt precursor and surface amine groups followed by hydrogen reduction. Pt NP-MSNs successfully catalyzed the conversion of cellulose into valuable polyols: sorbitol and mannitol and could be recycled at least three times under optimized reaction conditions. In order to expand the applications of MSN, a series of organofunctionalized large pore mesoporous silica nanoparticles (LPMSNs) were synthesized via the co-condensation method under acidic conditions using a triblock copolymer (P104) as the structure-directing agent. The hydrothermal temperature, the amount of organosilanes, and the sequence of reagent additions were optimized to yield functionalized LPMSN with large pore size and well-controlled particle morphology. The sulfonic acid functionalized silica synthesized under optimum conditions showed better catalytic performance than traditional sulfonic acid functionalized SBA-15 in esterification reactions. A mesoporous aluminum silicate (Al-MS) material has been synthesized via co-condensation by using NaAlO2 as aluminum source under basic conditions. The aluminum was tetrahedrally coordinated throughout Al-MS and, for the first time, the quantity of the surface aluminum sites was determined by solid-state NMR studies. The silicon to aluminum atomic ratios at the surface and in the bulk were around 100 and 60, respectively; indicating less chemically accessible aluminum…

Subjects/Keywords: catalyst; cellulose conversion; controlled-release delivery; mesoporous silica nanoparticle; particle morphology; Chemistry

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APA (6^th Edition):

Huang, W. (2010). Functionalized mesoporous silica nanoparticles (MSNs) for applications in drug delivery and catalysis. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/11680

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huang, Wei. “Functionalized mesoporous silica nanoparticles (MSNs) for applications in drug delivery and catalysis.” 2010. Thesis, Iowa State University. Accessed January 22, 2021. https://lib.dr.iastate.edu/etd/11680.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huang, Wei. “Functionalized mesoporous silica nanoparticles (MSNs) for applications in drug delivery and catalysis.” 2010. Web. 22 Jan 2021.

Vancouver:

Huang W. Functionalized mesoporous silica nanoparticles (MSNs) for applications in drug delivery and catalysis. [Internet] [Thesis]. Iowa State University; 2010. [cited 2021 Jan 22]. Available from: https://lib.dr.iastate.edu/etd/11680.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huang W. Functionalized mesoporous silica nanoparticles (MSNs) for applications in drug delivery and catalysis. [Thesis]. Iowa State University; 2010. Available from: https://lib.dr.iastate.edu/etd/11680

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Liu, Bing. Characterisation of Dust Particles Trapped in Silica Aerogels.

Degree: Fusion Plasma Physics, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38828

► This thesis involves the study of dust particles trapped in silica aerogel for fusion dust diagnostics purpose. The low velocity impact experiments are done… (more)

Subjects/Keywords: dust particle; silica aerogel; ion beam analysis; Fusion; Fusion

…can be compensated by the α particle power from fusion reaction, plasma is ignited. The… …interaction: extraction of heating power (mainly from α particle heating) and removal of… …formation. Erosion can be caused by particle ﬂuxes to the material surfaces. The particle ﬂux… …can be sputtered away. The physical sputtering yield depends on the incident particle energy… …the surface binding energy and the mass ratio of incident particle and target[10]…

10 more images…

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APA (6^th Edition):

Liu, B. (2011). Characterisation of Dust Particles Trapped in Silica Aerogels. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38828

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liu, Bing. “Characterisation of Dust Particles Trapped in Silica Aerogels.” 2011. Thesis, KTH. Accessed January 22, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38828.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liu, Bing. “Characterisation of Dust Particles Trapped in Silica Aerogels.” 2011. Web. 22 Jan 2021.

Vancouver:

Liu B. Characterisation of Dust Particles Trapped in Silica Aerogels. [Internet] [Thesis]. KTH; 2011. [cited 2021 Jan 22]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38828.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu B. Characterisation of Dust Particles Trapped in Silica Aerogels. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38828

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

20. Pinnaratip, Rattapol. EFFECT OF SILICA MICRO/NANO PARTICLES INCORPORATION OVER BIOINSPIRED POLY (ETHYLENE GLYCOL)-BASED ADHESIVE HYDROGEL.

Degree: MS, Department of Biomedical Engineering, 2017, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/534

► Cell infiltration is one of the most important characteristics of a degradable and bioactive biomaterial. Poly (ethylene glycol) (PEG), as one of the most… (more)

▼ Cell infiltration is one of the most important characteristics of a degradable and bioactive biomaterial. Poly (ethylene glycol) (PEG), as one of the most commonly used polymer in medicine, also faces such problems. This issue also prevalence in PEG derivatives such as poly (ethylene glycol)-glutaric acid-dopamine (PEG-GA-DM) which is a versatile bioadhesive. As a promising bioadhesive system that can be used and modified to suit various type of applications, modification to overcome cellular infiltration and degradation issues will help further expand the usefulness of the material in tissue repair application. The degradation issue is already preliminary solved by introducing ester linkage through carboxylic acid functionalization via glutaric acid incorporation. However, the resulting degradation rate is still not ideal. To further modify the porosity, pore structure, and degradation rate of the polymer, various types of non-crystalline silica particles were introduced into the polymer network. The benefit of including silica particles into the gel system may not limited only to the degradation and pore structure. One of the most interesting effects that this ceramic material may contain is its ability to release silica byproduct, specifically hydrolyzed silica or orthosilicic acid. Orthosilicic acid was proved to positively affect collagenous extracellular matrix formation as well as improves keratin and collagen based organ’s health. Using various formulations, a number of PEG-GA-DA and silica composite improvements were investigated. The silica’s contributions to a number of changes include shortened gelation time, increased mechanical strength, faster initial degradation, higher structural stability after degradation, and, ultimately, change in porous structure. It is interesting that PEG-GA-DA silica composite not only provided improvement for the PEG network but also provide benefit for innate property of silica particle. With silicic acid as degraded product, the composite also facilitates extracellular matrix formation as well as therapeutic macrophages recruitment. Advisors/Committee Members: Rupak M. Rajachar, Bruce P. Lee.

Subjects/Keywords: Silica particle; PEG; adhesive; bioactive material; poly(ethylene glycol); Biomaterials; Molecular, Cellular, and Tissue Engineering; Other Biomedical Engineering and Bioengineering; Polymer Science

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APA (6^th Edition):

Pinnaratip, R. (2017). EFFECT OF SILICA MICRO/NANO PARTICLES INCORPORATION OVER BIOINSPIRED POLY (ETHYLENE GLYCOL)-BASED ADHESIVE HYDROGEL. (Masters Thesis). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/534

Chicago Manual of Style (16^th Edition):

Pinnaratip, Rattapol. “EFFECT OF SILICA MICRO/NANO PARTICLES INCORPORATION OVER BIOINSPIRED POLY (ETHYLENE GLYCOL)-BASED ADHESIVE HYDROGEL.” 2017. Masters Thesis, Michigan Technological University. Accessed January 22, 2021. https://digitalcommons.mtu.edu/etdr/534.

MLA Handbook (7^th Edition):

Pinnaratip, Rattapol. “EFFECT OF SILICA MICRO/NANO PARTICLES INCORPORATION OVER BIOINSPIRED POLY (ETHYLENE GLYCOL)-BASED ADHESIVE HYDROGEL.” 2017. Web. 22 Jan 2021.

Vancouver:

Pinnaratip R. EFFECT OF SILICA MICRO/NANO PARTICLES INCORPORATION OVER BIOINSPIRED POLY (ETHYLENE GLYCOL)-BASED ADHESIVE HYDROGEL. [Internet] [Masters thesis]. Michigan Technological University; 2017. [cited 2021 Jan 22]. Available from: https://digitalcommons.mtu.edu/etdr/534.

Council of Science Editors:

Pinnaratip R. EFFECT OF SILICA MICRO/NANO PARTICLES INCORPORATION OVER BIOINSPIRED POLY (ETHYLENE GLYCOL)-BASED ADHESIVE HYDROGEL. [Masters Thesis]. Michigan Technological University; 2017. Available from: https://digitalcommons.mtu.edu/etdr/534

The Ohio State University

21. Sohn, Hyuntae. Applied and Fundamental Heterogeneous Catalysis Studies on Hydrodechlorination of Trichloroethylene and Steam Reforming of Ethanol.

Degree: PhD, Chemical Engineering, 2016, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1471608595

► The dissertation herein reports heterogeneous catalysis studies conducted on two different projects, (1) Hydrodechlorination of trichloroethylene and (2) Ethanol steam reforming. The former is… (more)

▼ The dissertation herein reports heterogeneous catalysis studies conducted on two different projects, (1) Hydrodechlorination of trichloroethylene and (2) Ethanol steam reforming. The former is associated with the process for trichloroethylene waste treatment and groundwater remediation technology whereas the latter pertains to hydrogen production. The presented work involves not only investigations on the catalytic activity, but also fundamental studies to understand how and why a catalyst works for a particular reaction. This dissertation is composed of two major parts.<b>(1) Part I (Chapter 1-4):</b> Trichloroethylene (TCE) is a chlorinated hydrocarbon solvent which has been widely used as a vapor degreaser for metal cleaning. TCE contains high level of toxicity, also known as a carcinogen. Recently, contamination of groundwater due to untreated TCE is a rapidly rising environmental issue, affecting the drinking water quality. The current waste treatment process for removal of TCE are mostly based on adsorption and extraction techniques. However, these processes do not provide a complete destruction of the TCE chemical structure; hence, it requires an additional incinerator to convert TCE into non harmful products. Hydrodechlorination (HDC) of TCE is a catalytic chemical reaction where TCE is converted to ethane and hydrochloric acid using hydrogen as a reducing agent. The treatment is a single step process, also can be performed <i>in situ</i> in groundwater. The most extensively used catalysts for this reaction are based on Pd metal. The main purpose of this study is to investigate the catalytic activity and stability of Pd supported on swellable organically modified silica (SOMS) for HDC of TCE. SOMS is a highly hydrophobic and adsorptive material. The material was recently developed and was reported in the literature. An interesting characteristic of SOMS is “swelling”, i.e., the volume of SOMS expands while adsorbing organics. The expansion of SOMS leads to generation of new pores thereby increasing its pore volume and surface area. When SOMS is treated with heat, contraction of SOMS occurs resulting a decrease in volume to its original size. Another important characteristic is its high hydrophobicity. It was deduced that Pd/SOMS showed promising catalytic activity compared to commercial Pd/Al₂O₃ in liquid phase HDC of TCE. This was attributed to the adsorptive and swelling properties of Pd/SOMS and its hydrophobicity, which helped to concentrate the TCE reactants in the vicinity of the active Pd sites. The increase in concentration near the active sites resulted in better kinetics for HDC reaction obtaining high TCE conversion. Furthermore, the strong hydrophobicity of SOMS helped to secure the Pd sites from ionic poisons such as sulfur and chlorine containing groups without losing its catalytic activity, e.g., when Pd/SOMS and Pd/Al₂O₃ was treated with 1 M HCl, Pd/SOMS retained its catalytic performance whereas Pd/Al₂O₃… Advisors/Committee Members: Ozkan, Umit S. (Advisor).

Subjects/Keywords: Chemical Engineering; hydrodechlorination; trichloroethylene; groundwater remediation; modified silica; SOMS; palladium; alumina; poison resistant; hydrophobicity; ethanol steam reforming; hydrogen production; cobalt; ceria; particle size; microgravity; synthesis of ceria

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APA (6^th Edition):

Sohn, H. (2016). Applied and Fundamental Heterogeneous Catalysis Studies on Hydrodechlorination of Trichloroethylene and Steam Reforming of Ethanol. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1471608595

Chicago Manual of Style (16^th Edition):

Sohn, Hyuntae. “Applied and Fundamental Heterogeneous Catalysis Studies on Hydrodechlorination of Trichloroethylene and Steam Reforming of Ethanol.” 2016. Doctoral Dissertation, The Ohio State University. Accessed January 22, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471608595.

MLA Handbook (7^th Edition):

Sohn, Hyuntae. “Applied and Fundamental Heterogeneous Catalysis Studies on Hydrodechlorination of Trichloroethylene and Steam Reforming of Ethanol.” 2016. Web. 22 Jan 2021.

Vancouver:

Sohn H. Applied and Fundamental Heterogeneous Catalysis Studies on Hydrodechlorination of Trichloroethylene and Steam Reforming of Ethanol. [Internet] [Doctoral dissertation]. The Ohio State University; 2016. [cited 2021 Jan 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1471608595.

Council of Science Editors:

Sohn H. Applied and Fundamental Heterogeneous Catalysis Studies on Hydrodechlorination of Trichloroethylene and Steam Reforming of Ethanol. [Doctoral Dissertation]. The Ohio State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1471608595

Freie Universität Berlin

22. Kord Daroun Kalai, Scheghajegh. Synthesis of silica Janus nanoparticles with metal semishells.

Degree: 2019, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-2299

► Dielectric colloids with asymmetric metal shells (Janus particles) have attracted much attention over the years. Their unique properties enable the application in versatile areas. One… (more)

▼ Dielectric colloids with asymmetric metal shells (Janus particles) have attracted much attention over the years. Their unique properties enable the application in versatile areas. One of the potential application fields is as an adhesion promoter between a dielectric surface and a metal; where one side of the colloid can chemically interact with a polymer substrate, while the other side contains a metal that can directly catalyze the electroless deposition process. In this work, challenges in the fabrication of asymmetric silica colloids with different metallic semishell coatings were investigated; and for the first time, a facile route was found towards the synthesis of large quantities of silica Janus particles with tunable metal shells and thicknesses. First, monodisperse silica particles in sizes ranging from 60–1900 nm in diameter were synthesized as starting materials. Since they were stored as a dry powder, different ultrasonic devices and sonication times were used to deagglomerate the colloids into their initial particle sizes with low polydispersity in a stable solution. Then, the influence of different reaction conditions was tested for binding a monolayer of 3-aminopropyltriethoxysilane (APTES) molecules on the silica colloids in ethanol. The surface functionalization can be enhanced by the presence of a catalyst or an increase in reaction time, or temperature because the reaction is in a thermodynamic equilibrium in protic solvents. An environmental and industrial friendly approach was introduced to synthesize silica particles with one monolayer of APTES. The number of amino groups on the surface was quantified by converting the accessible amino moieties into UV-Vis detectable species with a ninhydrin assay for all colloid sizes, and the C/H/N elemental analysis was used for smaller diameters. Subsequently, silica Janus particles were successfully synthesized with high mass yields (50―70%) when the surfactants didodecyldimethylammonium bromide (DDAB) or cetyltrimethylammonium bromide (CTAB) were present during the preparation of the particle-wax colloidosomes. Even a small concentration of the surfactant was sufficient to improve the mass yield. The radius of gyration of the surfactants was used to calculate the area that the molecules occupy on the silica surface. It was possible to manufacture single colloidosomes with closed-packed monolayers of silica particles on the wax surface. The silica colloids, embedded in wax, were grafted with a monolayer of APTES in the presence of triethylamine (TEA) after reacting for 1 h at 0 °C. Two characterization methods were successfully applied to compare the ratio of grafted and non-grafted area of the silica spheres, the so-called Janus balance. Metal layers were regio-selectively deposited onto the APTES spheres, and the corresponding shell coverage degrees were calculated from the corresponding SEM images. Additionally, the amine density at the surface was quantified with the ninhydrin assay. Both methods demonstrate for both surfactants that the Janus balance… Advisors/Committee Members: female (gender), Schalley, Christoph A. (firstReferee), Graf, Christina Maria (furtherReferee).

Subjects/Keywords: Asymmetric silica colloids; metallic semishell coatings; silica Janus particles with tunable metal shells and thicknesses; surfactants didodecyldimethylammonium bromide (DDAB) and cetyltrimethylammonium bromide (CTAB); particle-wax colloidosomes; Pd-seeded precursor particles; abrication of silica-core-metal-nanoshell composites for Ni, Cu, Au, Ag, and Pd; 500 Naturwissenschaften und Mathematik::540 Chemie::541 Physikalische Chemie

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APA (6^th Edition):

Kord Daroun Kalai, S. (2019). Synthesis of silica Janus nanoparticles with metal semishells. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-2299

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kord Daroun Kalai, Scheghajegh. “Synthesis of silica Janus nanoparticles with metal semishells.” 2019. Thesis, Freie Universität Berlin. Accessed January 22, 2021. http://dx.doi.org/10.17169/refubium-2299.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kord Daroun Kalai, Scheghajegh. “Synthesis of silica Janus nanoparticles with metal semishells.” 2019. Web. 22 Jan 2021.

Vancouver:

Kord Daroun Kalai S. Synthesis of silica Janus nanoparticles with metal semishells. [Internet] [Thesis]. Freie Universität Berlin; 2019. [cited 2021 Jan 22]. Available from: http://dx.doi.org/10.17169/refubium-2299.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kord Daroun Kalai S. Synthesis of silica Janus nanoparticles with metal semishells. [Thesis]. Freie Universität Berlin; 2019. Available from: http://dx.doi.org/10.17169/refubium-2299

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Freie Universität Berlin

23. Liesegang, Moritz. Abiogenes, amorphes Siliziumdioxid: Ordnung von der atomaren bis Zentimeterskala.

Degree: 2018, Freie Universität Berlin

URL: http://dx.doi.org/10.17169/refubium-69

► Die chemische Verwitterung von Silikatmineralen ist ein Hauptbestandteil des globalen Silizium-Kreislaufs und resultiert in einem der fundamentalen Bausteine der Bio- und Geosphäre der Erde: Silica-Nanopartikel… (more)

▼ Die chemische Verwitterung von Silikatmineralen ist ein Hauptbestandteil des globalen Silizium-Kreislaufs und resultiert in einem der fundamentalen Bausteine der Bio- und Geosphäre der Erde: Silica-Nanopartikel (<1 µm) aus amorphem, hydratisiertem SiO2 (Opal-A). Amorphe Nanopartikel sind allgegenwärtig in der Natur und werden zunehmend als essenzielle Vorläufer für die Carbonat- und Phosphatkristallisation und anschließende Wachstumsprozesse in natürlichen Systemen identifiziert. Allerdings bilden nur abiogene Silica-Nanopartikel röntgenamorphe, dreidimensional-periodische Gitter-anordnungen. Seit der ersten mikromorphologischen Beschreibung von Opal-A in den frühen 1960er Jahren wird angenommen, dass Wachstum und Ordnung uniformer Nanopartikel in sedimentären Umgebungen durch einen Gelierungsprozess und gravitative Ablagerung in einer stagnierenden Lösung ablaufen. Diese Annahme gilt für Hohlraumfüllungen und Pseudomorphosen. Bislang mangelt es jedoch an direkten Beobachtungen, um diesen elementaren Schritt im Silica-Bildungsprozess zu belegen. Ebenfalls ungeklärt sind die Prozesse, welche der frühdiagenetischen Umwandlung von metastabilem, amorphem Silica zu höherkristallinen opalinen Phasen zugrunde liegen. Um die Prozesse zu untersuchen, die das röntgenamorphe Silicasystem von einem ungeordneten in einen geordneten Zustand überführen, untersuche ich in dieser Arbeit Opal-A Hohlraumfüllungen und Pseudomorphosen aus chemisch tiefenverwitterten Sedimentgesteinen des Great Artesian Basin (Zentralaustralien). Durch eine Kombination hochauflösender Elektronenmikroskopie, Nanotomographie, Elektronenstrahlmikrosondenanalytik, Mikroröntgenbeugung und Mikro-Ramanspektroskopie war es möglich, die Struktur und chemische Zusammensetzung von abiogenem, amorphem Silica präzise zu charakterisieren. Die vorliegende Arbeit zeigt auf, welche grundlegenden Ordnungsprozesse auf der atomaren und kolloidalen Skala identifiziert wurden. Diese Ergebnisse bilden die Grundlage für neue, kohärente Modelle der Ordnungsprozesse eines natürlichen, amorphen Materials, auf dem Weg von dispergierten Partikeln zu echten Einkristallen. In Muschelschalen, Dehnungsrissen und Cherts ersetzen Silica-Nanosphären Dolomit und verzwillingten Calcit mittels eines grenzflächenkontrollierten Lösungs-Fällungs-Prozesses. Elektronen-mikroskopie und Nanotomographie zeigen, dass während dieses Prozesses kristalline Strukturen durch kontinuierliche Nanopartikelnukleation, -aggregation und Anordnung in einer kubisch dichtesten Kugelpackung (fcc) gebildet werden. Die dichtest-gepackten Netzebenen dieser geordneten Partikel-aggregate stimmen mit den thermodynamisch stabilsten Calcitflächen überein. Ich folgere in einem neuen Modell, dass der Ersetzungsprozess einem nanopartikel-basierten, nichtklassischen Kristallisationspfad folgt. Darüber hinaus zeigen Elektronen- und Durchlichtmikroskopie, dass die makroskopischen Eigenschaften von Opal-A Hohlraumfüllungen direkt mit strömungsinduzierten mikromorphologischen Merkmalen korrelieren. Nicht-Newtonsches Fließen… Advisors/Committee Members: male (gender), Milke, Ralf (firstReferee), John, Timm (furtherReferee), Plümper, Oliver (furtherReferee).

Subjects/Keywords: Opal; XRD; amorphous silica; mineral chemistry; photonic crystal; replacement; silica colloid; crystallization by particle attachment; 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften; 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::552 Petrologie

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Liesegang, M. (2018). Abiogenes, amorphes Siliziumdioxid: Ordnung von der atomaren bis Zentimeterskala. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-69

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Liesegang, Moritz. “Abiogenes, amorphes Siliziumdioxid: Ordnung von der atomaren bis Zentimeterskala.” 2018. Thesis, Freie Universität Berlin. Accessed January 22, 2021. http://dx.doi.org/10.17169/refubium-69.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Liesegang, Moritz. “Abiogenes, amorphes Siliziumdioxid: Ordnung von der atomaren bis Zentimeterskala.” 2018. Web. 22 Jan 2021.

Vancouver:

Liesegang M. Abiogenes, amorphes Siliziumdioxid: Ordnung von der atomaren bis Zentimeterskala. [Internet] [Thesis]. Freie Universität Berlin; 2018. [cited 2021 Jan 22]. Available from: http://dx.doi.org/10.17169/refubium-69.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liesegang M. Abiogenes, amorphes Siliziumdioxid: Ordnung von der atomaren bis Zentimeterskala. [Thesis]. Freie Universität Berlin; 2018. Available from: http://dx.doi.org/10.17169/refubium-69

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Gothenburg / Göteborgs Universitet

24. Johnsson, Ann-Cathrin. On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique.

Degree: 2011, University of Gothenburg / Göteborgs Universitet

URL: http://hdl.handle.net/2077/26662

► Gels are weak, solid-like structures that arise when colloidal particles aggregate to form a network of particle clusters. A variety of colloidal systems that are… (more)

▼ Gels are weak, solid-like structures that arise when colloidal particles aggregate to form a network of particle clusters. A variety of colloidal systems that are important scientifically as well as in industrial applications are capable of gel formation, e.g. globular protein solutions, colloid-polymer mixtures, and metal oxides. Yet, the mechanisms of the gelation process are far from understood, and the investigation of the aggregation and gelation of colloidal dispersions is, therefore, of great importance. Especially, the size distribution and structure of the aggregates are known to affect the gelation, and the main focus of this thesis is to improve our understanding of the initial aggregate formation in concentrated silica dispersions. The electrospray-scanning mobility particle sizer (ES-SMPS) technique has previously been demonstrated to be a valuable method for size distribution analysis of pure colloidal dispersions. Here, the ES-SMPS method was used to monitor the size distribution variation during electrolyte induced slow aggregation of concentrated silica dispersions. Number size distributions provide information about the primary particles as well as the formed aggregates. The influence of the ion specificity, as well as three initial particle morphologies, on the aggregation behaviour was investigated. Moreover, the aggregate diameters obtained by the ES-SMPS method were compared to the those obtained by other techniques such as scanning electron microscopy (SEM) and in situ small angle X-ray scattering (SAXS). The initial aggregate formation could be monitored accurately using the ES-SMPS method and compact, nearly spherical aggregates were observed for two of the initial morphologies. It was concluded that these resulted from a dynamic aggregation process where the aggregates broke and reformed several times prior to the gelation. More elongated aggregates were observed in the third dispersion; these aggregates were more rapidly stabilized by interparticle bonds and formed the most stable gel structures. The surface properties of the particles were found to affect the aggregate structure. Clear ion specific effects were observed; the most stable aggregates were formed in the presence of the least hydrated alkali ions, whereas the rate of gel stability increase was faster in the presence of the more strongly hydrated ions. As expected, the alkali ions adsorbed according to the direct Hofmeister sequence. A gel layer on the silica particle surfaces was identified for all dispersions investigated. The thickness of these layers were estimated using different techniques and found to be 2-4 nm thick depending on the dispersion.

Subjects/Keywords: Colloidal silica dispersion; aggregation; gelation; electrospray (ES); scanning mobility particle sizer (SMPS); synchrotron radiation small-angle x-ray scattering (SR-SAXS); electron microscopy (EM); dynamic light scattering (DLS); particle morphology; ion specificity; gel layer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Johnsson, A. (2011). On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique. (Thesis). University of Gothenburg / Göteborgs Universitet. Retrieved from http://hdl.handle.net/2077/26662

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Johnsson, Ann-Cathrin. “On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique.” 2011. Thesis, University of Gothenburg / Göteborgs Universitet. Accessed January 22, 2021. http://hdl.handle.net/2077/26662.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Johnsson, Ann-Cathrin. “On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique.” 2011. Web. 22 Jan 2021.

Vancouver:

Johnsson A. On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique. [Internet] [Thesis]. University of Gothenburg / Göteborgs Universitet; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2077/26662.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Johnsson A. On the Electrolyte Induced Aggregation of Concentrated Silica Dispersions - An Experimental Investigation Using the Electrospray Technique. [Thesis]. University of Gothenburg / Göteborgs Universitet; 2011. Available from: http://hdl.handle.net/2077/26662

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

25. Topham, Nathan. Control of Hexavalent Chromium Emission from Welding Using Silica Precursors as Shield Gas Additives.

Degree: M.E., Environmental Engineering Sciences, 2010, University of Florida

URL: https://ufdc.ufl.edu/UFE0042177

► Hexavalent chromium (Cr6+) emitted from arc welding poses serious health risks to workers exposed to welding fumes in occupational settings. Stainless steel gas tungsten arc… (more)

▼ Hexavalent chromium (Cr6+) emitted from arc welding poses serious health risks to workers exposed to welding fumes in occupational settings. Stainless steel gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) produce aerosols that contain Cr6+, nickel, manganese, and gaseous pollutants such as ozone and nitrogen oxides (NOx) that lead to a number of respiratory and neurological ailments as well as cancer. Traditional welding technologies employ shield gas or material incorporated into the welding wire to minimize fume formation. However, significant amounts of hazardous air pollutants (HAPs) are generated during gas shielded welding processes. In this study, tetraethyloxysilane (TEOS) and tetramethylsilane (TMS) were added to GTAW and GMAW shield gas to provide a two-fold approach at controlling HAPs produced during stainless steel welding. Silica precursors acted as reducing agents when they decomposed in the high temperature welding arc, thereby limiting ozone and Cr6+ formation. Additionally, an amorphous film of silica (SiO2) was deposited on welding fume particles. This film insulated the aerosols, preventing subsequent oxidation of surface chromium and masking the toxic effects of all of the metals contained in the particles. Cr6+ in GTAW fumes was reduced by 45% when 26.3% of the shield gas was used as TEOS carrier gas. A 53% reduction in NOx emissions was observed, indicating a reduction in reactive oxygen species. Tranmission electron microscope (TEM) imagery showed a film of SiO2 on welding fume particles. The SiO2 film could insulate GTAW aerosols, masking the toxic effects of all metals within the fume particles. Experimental results demonstrated that total shield gas flow rate impacted the effectiveness of TMS as a GMAW shield gas additive. Low shield gas flow rates led to premature thermal decomposition of TMS and no observable change in Cr6+ mass in fumes. Increasing shield gas flow rate led to significant reductions in Cr6+ mass when TMS was used. When 4.2% of the 30 liter per minute (Lpm) shield gas flow rate was used as TMS carrier gas, Cr6+ mass in GMAW fumes was reduced by at least 92.9%. Adding TMS to GMAW shield gas increased fume particle size beyond the nanometer range in all shield gas flow rates tested. Geometric mean particle size increased from 40-60 nanometers (nm) under baseline conditions to 180-300 nm when TMS was added. SiO2 particles formed from decomposition of silica precursors scavenged nanoparticles through intercoagulation. TEM imagery provided visual evidence of an amorphous film of SiO2 on some fume particles along with the presence of large amorphous SiO2 agglomerates. These results showed that vapor phase sorbents may be capable of reducing the health risks posed by welding fumes through elimination of nanoparticles and reduction of Cr6+. ( en ) Advisors/Committee Members: Wu, Chang-Yu (committee chair), Ilacqua, Vito (committee member), Bonzongo, Jean-Claud (committee member).

Subjects/Keywords: Aerosols; Charge carriers; Chromium; Diameters; Fumes; Gas flow; Metal particles; Particle size classes; Particle size distribution; Welding; chromium, fume, hexavalent, precursor, silica, sorbent, welding

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Topham, N. (2010). Control of Hexavalent Chromium Emission from Welding Using Silica Precursors as Shield Gas Additives. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0042177

Chicago Manual of Style (16^th Edition):

Topham, Nathan. “Control of Hexavalent Chromium Emission from Welding Using Silica Precursors as Shield Gas Additives.” 2010. Masters Thesis, University of Florida. Accessed January 22, 2021. https://ufdc.ufl.edu/UFE0042177.

MLA Handbook (7^th Edition):

Topham, Nathan. “Control of Hexavalent Chromium Emission from Welding Using Silica Precursors as Shield Gas Additives.” 2010. Web. 22 Jan 2021.

Vancouver:

Topham N. Control of Hexavalent Chromium Emission from Welding Using Silica Precursors as Shield Gas Additives. [Internet] [Masters thesis]. University of Florida; 2010. [cited 2021 Jan 22]. Available from: https://ufdc.ufl.edu/UFE0042177.

Council of Science Editors:

Topham N. Control of Hexavalent Chromium Emission from Welding Using Silica Precursors as Shield Gas Additives. [Masters Thesis]. University of Florida; 2010. Available from: https://ufdc.ufl.edu/UFE0042177

26. Moura, Sérgio de Paula. Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica.

Degree: Mestrado, Bioquímica, 2003, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/46/46131/tde-20112006-014013/ ;

►

O estudo da adsorção de membranas-modelo na superficie de partículas sólidas é uma importante linha de pesquisa em áreas científicas que estão em rápido desenvolvimento… (more)

▼

O estudo da adsorção de membranas-modelo na superficie de partículas sólidas é uma importante linha de pesquisa em áreas científicas que estão em rápido desenvolvimento tais como o desenvolvimento de biosensores, a construção de kits imunológicos ou o design de materiais biocompatíveis. Neste trabalho foram analisadas sob o ponto de vista físico-químico, as interações entre partículas coloidais de sílica hidrofilica e lipossomos catiônicos de brometo de dioctadecildimetilamônio (DODAB). O desafio de romper a estrutura rígida fechada de lipossomos quando em contato com partículas de sílica foi contornado com o uso de dispersões de brometo dioctadecildimetilamônio (DODAB) compostas de fragmentos nanométricos abertos de bicamadas ao invés de vesículas. Em baixa força iônica e pH 6.5, a adsorção de DODAB a partir de fragmentos de bicamadas de DODAB (BF) sobre sílica hidrofilica foi quantificada por isotermas de adsorção a 0,0.1, 0.5 e 1.0mM de KCl ou TRIS-HCI. A adsorção de DODAB aumentou em função da concentração de sal. Como a literatura de titulações potenciométricas de sílica para determinação de carga superficial das partículas forneceu cargas superficiais em diversas condições experimentais de pH e força iônica (Tadros e Lyklema, 1968), foi possível estabelecer a relação entre adsorção de bicamadas catiônicas de DODAB e a densidade superficial de carga sobre a sílica. Houve um aumento monotônico de adsorção à medida que a densidade de carga da partícula aumentava. lsotermas de adsorção apresentaram formas típicas de adsorção competitiva com um máximo seguido de uma diminuição da adsorção em função da concentração de DODAB no sobrenadante. Esses perfis sugeriram que a atração hidrofóbica entre BF adsorvidos e livres poderia estar reduzindo a adsorção sobre a superficie da partícula. A adsorção de DODAB BF sobre a sílica aparentemente não conduziria a um recobrimento como bicamada contínua sobre a partícula, estando os BF adsorvidos ainda disponíveis para interação através de suas bordas hidrofóbicas com os fragII}entos livres em dispersão. Em pH 6.5, ao longo de uma faixa de concentração de DODAB (O- 1.0mM)e de KCl (0.1 - 10.0mM), a partir da medição dos tamanhos de partícula, análise dos potenciais-zeta, fotografias das misturas e cinéticas de sedimentação de partículas, pôde-se concluir que a estabilidade coloidal das partículas nas misturas foi governada pelo fator R, que é a relação de áreas superficiais totais para bicamadas Ab e partículas Ap, R= Ab/Ap. Em R - 0.5, o potencial-zeta médio (Ç) foi zero, o diâmetro médio de partícula (Dz) foi máximo, a sedimentação foi rápida e a estabilidade coloidal foi mínima; em R> 1, o çmedido foi positivo, Dz foi mínimo, a sedimentação não ocorreu e a estabilidade coloidal foi máxima. Em baixa força iônica, foi alcançada uma alta estabilidade coloidal de partículas na presença de fragmentos de bicamadas catiônicas para valores de R iguais ou maiores que 1.

The study of adsorption of model-membranes on the surface of solid partic1es is an important line of research in…

Advisors/Committee Members: Ribeiro, Ana Maria Carmona.

Subjects/Keywords: Adsorção de Membranas; Adsorption Colloidal; Bicamadas Sílica; DODAB; DODAB; Lipid pilayer; Partículas; Silica particle

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moura, S. d. P. (2003). Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/46/46131/tde-20112006-014013/ ;

Chicago Manual of Style (16^th Edition):

Moura, Sérgio de Paula. “Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica.” 2003. Masters Thesis, University of São Paulo. Accessed January 22, 2021. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-20112006-014013/ ;.

MLA Handbook (7^th Edition):

Moura, Sérgio de Paula. “Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica.” 2003. Web. 22 Jan 2021.

Vancouver:

Moura SdP. Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica. [Internet] [Masters thesis]. University of São Paulo; 2003. [cited 2021 Jan 22]. Available from: http://www.teses.usp.br/teses/disponiveis/46/46131/tde-20112006-014013/ ;.

Council of Science Editors:

Moura SdP. Bicamadas catiônicas em sílica: adsorção e estabilidade coloidal a baixa força iônica. [Masters Thesis]. University of São Paulo; 2003. Available from: http://www.teses.usp.br/teses/disponiveis/46/46131/tde-20112006-014013/ ;

27. Στάθης, Γεώργιος. Ο ρόλος της πυριτίας στη βελτιστοποίηση των μηχανικών ιδιοτήτων της πορσελάνης.

Degree: 2007, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/16292

►

The aim of this Ph.D. work is to investigate the quartz related factors that affect the mechanical properties of porcelain as well as the mechanisms… (more)

▼

The aim of this Ph.D. work is to investigate the quartz related factors that affect the mechanical properties of porcelain as well as the mechanisms that control the development of high mechanical strength. The studied range of values for each factor was focused οn the range that is used in industrial practice. In this context, the effect of filler grain size, quartz content, firing temperature and time on the physical and mechanical properties of a sanitaryware porcelain has been studied. The results are being discussed in respect to the three suggested theories on porcelain strength (i.e. matrix reinforcement theory, dispersion strengthening theory, mullite hypothesis). The investigation has been carried out by using the Taguchi method for experimental design. It is shown that quartz grain size is the most important factor regarding porcelain strength. It influences strength in two ways: directly by inducing compressive stresses to the vitreous phase and indirectly through the development of a favorable microstructure. It is shown that two perquisites have to be met in order to achieve high bending strength. These are a well developed microstructure and a high direct effect of quartz. Both are met for bodies containing quartz grains in the range 5-20 μm. These bodies exhibited ~30% higher strength than the reference industrial porcelain. The results do not confirm the mullite and the dispersion strengthening hypothesis. On the other hand the matrix reinforcement theory and the mechanism that quartz grains retard crack propagation agree with the results. Subsequently, the work is focused on the direct effect of quartz on strength. The aim is to study the direct effect as a function of quartz grain size and content without the interference of the indirect effect. Silica fume (SF) is used in order to achieve dense microstructure with varying quartz content and grain size. The results showed that SF enhances sintering allowing the development of a dense microstructure even when coarse quartz is used. Strength is increased in the cases which sintering would be incomplete, without the addition of SF. However, when the microstructure is adequate dense, increasing the SF content reduces strength. It is also shown that increasing the levels of quartz grain size and content results in increased strength. However, after a certain point, further increase of coarse quartz content results in strength reduction due to the induction of flaws around the quartz grains.

Η εργασία έχει στόχο την εξέταση των παραγόντων που καθορίζουν τις μηχανικές ιδιότητες της πορσελάνης και σχετίζονται με το χαλαζία καθώς και τον προσδιορισμό των μηχανισμών που ο χαλαζίας επιδρά στην αντοχή σε θραύση της πορσελάνης. Η μελέτη εστιάστηκε σε μια Ελληνική πορσελάνη βιομηχανικής προέλευσης. Αρχικά εξετάστηκαν ποιοι από τους παράγοντες: μέγεθος κόκκων πληρωτικού, περιεκτικότητα χαλαζία, θερμοκρασία και χρόνος έψησης επηρεάζουν πραγματικά και σε ποιο βαθμό τις μηχανικές ιδιότητες. Στη συνέχεια, επιχειρήθηκε η αποσαφήνιση των μηχανισμών που καθορίζουν τις…

Subjects/Keywords: Χαλαζίας; Μηχανικές ιδιότητες; Πορσελάνη; Κοκκομετρική κατανομή; Quartz; Mechanical properties; Porcelain; Particle size distribution; Silica fume

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Στάθης, . �. (2007). Ο ρόλος της πυριτίας στη βελτιστοποίηση των μηχανικών ιδιοτήτων της πορσελάνης. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/16292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Στάθης, Γεώργιος. “Ο ρόλος της πυριτίας στη βελτιστοποίηση των μηχανικών ιδιοτήτων της πορσελάνης.” 2007. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed January 22, 2021. http://hdl.handle.net/10442/hedi/16292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Στάθης, Γεώργιος. “Ο ρόλος της πυριτίας στη βελτιστοποίηση των μηχανικών ιδιοτήτων της πορσελάνης.” 2007. Web. 22 Jan 2021.

Vancouver:

Στάθης �. Ο ρόλος της πυριτίας στη βελτιστοποίηση των μηχανικών ιδιοτήτων της πορσελάνης. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2007. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10442/hedi/16292.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Στάθης �. Ο ρόλος της πυριτίας στη βελτιστοποίηση των μηχανικών ιδιοτήτων της πορσελάνης. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2007. Available from: http://hdl.handle.net/10442/hedi/16292

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. L. Pagliari. PARTICLE SIZE EFFECT ON KINETICS AND THERMODYNAMICS OF PHASE TRANSITIONS IN MINERALS.

Degree: 2015, Università degli Studi di Milano

URL: http://hdl.handle.net/2434/260489

► Phase transitions in minerals are transformations naturally occurring when environmental conditions, such as pressure and temperature, change. So, studying their evolution means to understand the… (more)

Subjects/Keywords: phase transitions; particle size effect; thermodynamics; nanocrystallinity; silica; zirconia; manganites; strain; kinetics; x-ray powder diffraction; resonant ultrasound spectroscopy; Settore ING-IND/22 - Scienza e Tecnologia dei Materiali; Settore GEO/06 - Mineralogia; Settore CHIM/02 - Chimica Fisica

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pagliari, L. (2015). PARTICLE SIZE EFFECT ON KINETICS AND THERMODYNAMICS OF PHASE TRANSITIONS IN MINERALS. (Thesis). Università degli Studi di Milano. Retrieved from http://hdl.handle.net/2434/260489

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pagliari, L.. “PARTICLE SIZE EFFECT ON KINETICS AND THERMODYNAMICS OF PHASE TRANSITIONS IN MINERALS.” 2015. Thesis, Università degli Studi di Milano. Accessed January 22, 2021. http://hdl.handle.net/2434/260489.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pagliari, L.. “PARTICLE SIZE EFFECT ON KINETICS AND THERMODYNAMICS OF PHASE TRANSITIONS IN MINERALS.” 2015. Web. 22 Jan 2021.

Vancouver:

Pagliari L. PARTICLE SIZE EFFECT ON KINETICS AND THERMODYNAMICS OF PHASE TRANSITIONS IN MINERALS. [Internet] [Thesis]. Università degli Studi di Milano; 2015. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2434/260489.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pagliari L. PARTICLE SIZE EFFECT ON KINETICS AND THERMODYNAMICS OF PHASE TRANSITIONS IN MINERALS. [Thesis]. Università degli Studi di Milano; 2015. Available from: http://hdl.handle.net/2434/260489

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Qiao, Xiaoguang. Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media : Synthèse de particules hybrides silice-polymère par polyméristaion radicalaire contrôlée en milieu aqueux dispersé.

Degree: Docteur es, Chimie, 2013, Université Claude Bernard – Lyon I

URL: http://www.theses.fr/2013LYO10332

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Des polymères à base de méthacrylate de poly(oxyde d'éthylène) (PEOMA) avec des chaînes pendantes PEO (Mn = 300 ou 950 g mol-1) ou des copolymères… (more)

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Des polymères à base de méthacrylate de poly(oxyde d'éthylène) (PEOMA) avec des chaînes pendantes PEO (Mn = 300 ou 950 g mol-1) ou des copolymères de PEOMA300 et d'acide méthacrylique (AMA) ont été synthétisés par polymérisation radicalaire contrôlée par les nitroxydes en utilisant une alkoxyamine (BlocBuilder®) comme amorceur en présence de SG1 et d'une faible quantité de styrène. Les copolymères à base de PEOMA300 et d'AMA sont thermo- et pH-sensibles. Les deux types de macroalkoxyamines ont été utilisés pour amorcer la copolymérisation en émulsion du méthacrylate de n-butyle et du styrène et former, par auto-assemblage induit par la polymérisation, des particules composées de copolymères à blocs amphiphiles, en absence ou présence de particules de silice. En absence de silice, des particules stabilisées de façon stérique ou électrostérique ont été formées. La polymérisation présente les caractéristiques d'une polymérisation contrôlée avec néanmoins la formation d'une faible proportion de chaînes mortes. L'effet du pH, de la force ionique et de la nature ou de la concentration des macroalkoxyamines sur la cinétique de polymérisation et la morphologie des particules a été étudié, et des sphères, des vésicules ou des nanofibres ont été obtenues. Les macroalkoxyamines à base de PEO s'adsorbent sur la silice via la formation de liaisons hydrogène entre les chaînes PEO et les groupes silanol. La synthèse de copolymères à blocs en surface de la silice a conduit à la formation de particules hybrides de différentes morphologies (bonhomme de neige, multipodes, framboise, coeur-écorce, têtard, mille pattes) liées à la taille de la silice, au pH et à la nature du macroamorceur

Water-soluble brush-type polymers composed of poly(ethylene)oxide methacrylate (PEOMA) units with PEO side groups of various chain lengths (Mn = 300 and 950 g mol-1) or of PEOMA300 with methacrylic acid (MAA) were synthesized by nitroxide-mediated polymerization using an alkoxyamine initiator (BlocBuilder®) and SG1 nitroxide in the presence of a low amount of styrene. The PEOMA300-MAA based copolymers showed a dual temperature/pH response. The two series of macroalkoxyamines were used in aqueous emulsion copolymerization of nbutyl methacrylate and styrene leading to the formation of particles composed of amphiphilic block copolymers through polymerization-induced self-assembly, in both the absence and presence of silica. The experiments performed in the absence of silica particles resulted in the formation of sterically or electrosterically stabilized latexes. The polymerization exhibited all the features of a controlled system with however the presence of a small proportion of dead chains. The effect of pH value, ionic strength and type and concentration of the macroalkoxyamine initiator on polymerization kinetics and latex morphologies was investigated. Depending on the reaction conditions, spherical particles, vesicles or nanofibers were successfully prepared. The PEO-based macroalkoxyamines were shown to adsorb on the silica surface via hydrogen…

Advisors/Committee Members: Bourgeat-Lami, Élodie (thesis director), Lansalot, Muriel (thesis director), Charleux, Bernadette (thesis director).

Subjects/Keywords: Silice; Polymérisation en émulsion sans tensioactif; Polymérisation radicalaire contrôlée; Nitroxyde; Acide méthacrylique; Copolymères à blocs; Morphologie; Poly(oxyde d'éthylène); Silica; Surfactant-free emulsion polymerization; Controlled radical polymerization; Nitroxide; Methacrylic acid; Block copolymers; Particle morphology; Poly(ethylene oxide) methacrylate; 547.28

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Qiao, X. (2013). Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media : Synthèse de particules hybrides silice-polymère par polyméristaion radicalaire contrôlée en milieu aqueux dispersé. (Doctoral Dissertation). Université Claude Bernard – Lyon I. Retrieved from http://www.theses.fr/2013LYO10332

Chicago Manual of Style (16^th Edition):

Qiao, Xiaoguang. “Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media : Synthèse de particules hybrides silice-polymère par polyméristaion radicalaire contrôlée en milieu aqueux dispersé.” 2013. Doctoral Dissertation, Université Claude Bernard – Lyon I. Accessed January 22, 2021. http://www.theses.fr/2013LYO10332.

MLA Handbook (7^th Edition):

Qiao, Xiaoguang. “Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media : Synthèse de particules hybrides silice-polymère par polyméristaion radicalaire contrôlée en milieu aqueux dispersé.” 2013. Web. 22 Jan 2021.

Vancouver:

Qiao X. Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media : Synthèse de particules hybrides silice-polymère par polyméristaion radicalaire contrôlée en milieu aqueux dispersé. [Internet] [Doctoral dissertation]. Université Claude Bernard – Lyon I; 2013. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2013LYO10332.

Council of Science Editors:

Qiao X. Synthesis of silica-polymer hybrid particles via controlled radical polymerization in aqueous dispersed media : Synthèse de particules hybrides silice-polymère par polyméristaion radicalaire contrôlée en milieu aqueux dispersé. [Doctoral Dissertation]. Université Claude Bernard – Lyon I; 2013. Available from: http://www.theses.fr/2013LYO10332

Université Montpellier II

30. M'Nasri, Najib. Elaboration de nanomatériaux composites mé[email protected] de silice mésoporeuses (MSN) : étude des performances catalytiques en phase aqueuse et des propriétés d'adsorption sélective du diiode en phase gaz : Preparation of transition mela containing mesoporous silica based nano-sized particles : study of the catalytic perfermance in aqueous solution and selective adsorption capacity in the gaz phase.

Degree: Docteur es, Chimie et physicochimie des matériaux, 2014, Université Montpellier II

URL: http://www.theses.fr/2014MON20199

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Ce travail a concerné l'étude de la fonctionnalisation métallique et du contrôle morphologique de nanoparticules de silice mésoporeuse appelées MSN. La voie de fonctionnalisation par… (more)

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Ce travail a concerné l'étude de la fonctionnalisation métallique et du contrôle morphologique de nanoparticules de silice mésoporeuse appelées MSN. La voie de fonctionnalisation par synthèse directe a été privilégiée et a consisté en une encapsulation des précurseurs métalliques dans la phase porogène. L'insertion de cuivre, palladium, platine, argent or et de bimétalliques Cu/Pd et Pd/Pt a été réalisée. Il résulte de cette approche une localisation des nanoparticules métalliques dans les pores et d'une grande accessibilité des fonctionnalités à l'origine des excellentes performances catalytiques mesurées. Ces performances et le recyclage du catalyseur [email protected] ont été démontrés pour des réactions de Huisgen et de Sonogashira. Il a également été étudié l'adsorption de l'iode moléculaire en phase gaz sur des MSN fonctionnalisées par des nanoparticules d'argent avec d'excellentes capacités de rétention.

The objective of this thesis was to develop efficient synthesis routes to prepare mesoporous silica-based nano-sized particles, designated as MSN, with controllable morphology and derivatised with selected transition metals. One-pot preparation and surface functionalisation procedures based on the insertion of the metal-phase precursor into the porogen aggregates were thoroughly optimised leading to silica particles containing such single metals as copper, palladium, platinum, silver or gold, as well as a two-metal phase of copper and palladium or that of palladium and platinum. It was demonstrated that the highly dispersed metal phase was localised on the pore surface and therefore it was readily accessible to the target chemicals on which to base the catalytic performance of the resulting materials. Among others, the remarkable catalytic performance of the [email protected] material in Huisgen and Sonogashira reactions and its propensity to undergo efficient recycling were proven through laboratory-scale testing. Experimental study of the selective adsorption of iodine vapour onto MSN supports functionalised with silver nanoparticles indicated an excellent retention capacity of such materials.

Advisors/Committee Members: Zając, Jerzy (thesis director), Charnay, Clarence (thesis director).

Subjects/Keywords: Nanoparticules de Silice mésoporeuse (MSN); Contrôle de la morphologie; Fonctionnalisation métallique; RMN du 129Xe; Catalyse hétérogène; Adsorption sélective en phase gaz.; Mesoporous nano-Sized silica particles (MSN); Controllable particle morphology; Transition metal functionalisation; 129Xe NMR characterisation; Heterogeneous catalysis; Selective gas-Phase adsorption

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

M'Nasri, N. (2014). Elaboration de nanomatériaux composites mé[email protected] de silice mésoporeuses (MSN) : étude des performances catalytiques en phase aqueuse et des propriétés d'adsorption sélective du diiode en phase gaz : Preparation of transition mela containing mesoporous silica based nano-sized particles : study of the catalytic perfermance in aqueous solution and selective adsorption capacity in the gaz phase. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2014MON20199

Chicago Manual of Style (16^th Edition):

M'Nasri, Najib. “Elaboration de nanomatériaux composites mé[email protected] de silice mésoporeuses (MSN) : étude des performances catalytiques en phase aqueuse et des propriétés d'adsorption sélective du diiode en phase gaz : Preparation of transition mela containing mesoporous silica based nano-sized particles : study of the catalytic perfermance in aqueous solution and selective adsorption capacity in the gaz phase.” 2014. Doctoral Dissertation, Université Montpellier II. Accessed January 22, 2021. http://www.theses.fr/2014MON20199.

MLA Handbook (7^th Edition):

M'Nasri, Najib. “Elaboration de nanomatériaux composites mé[email protected] de silice mésoporeuses (MSN) : étude des performances catalytiques en phase aqueuse et des propriétés d'adsorption sélective du diiode en phase gaz : Preparation of transition mela containing mesoporous silica based nano-sized particles : study of the catalytic perfermance in aqueous solution and selective adsorption capacity in the gaz phase.” 2014. Web. 22 Jan 2021.

Vancouver:

M'Nasri N. Elaboration de nanomatériaux composites mé[email protected] de silice mésoporeuses (MSN) : étude des performances catalytiques en phase aqueuse et des propriétés d'adsorption sélective du diiode en phase gaz : Preparation of transition mela containing mesoporous silica based nano-sized particles : study of the catalytic perfermance in aqueous solution and selective adsorption capacity in the gaz phase. [Internet] [Doctoral dissertation]. Université Montpellier II; 2014. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2014MON20199.

Council of Science Editors:

M'Nasri N. Elaboration de nanomatériaux composites mé[email protected] de silice mésoporeuses (MSN) : étude des performances catalytiques en phase aqueuse et des propriétés d'adsorption sélective du diiode en phase gaz : Preparation of transition mela containing mesoporous silica based nano-sized particles : study of the catalytic perfermance in aqueous solution and selective adsorption capacity in the gaz phase. [Doctoral Dissertation]. Université Montpellier II; 2014. Available from: http://www.theses.fr/2014MON20199

Open Access Theses and Dissertations