subject:(layer by layer)

Texas A&M University

1. Davis, Ryan. Phase Behavior and Electrophoretic Deposition of LPEI-PAA Polyelectrolyte Complexes.

Degree: 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/149587

► This project aims to discover a new means of overcoming the drawbacks of traditional layer-by-layer dip coating through the use of polyelectrolyte complexes (PECs) and… (more)

▼ This project aims to discover a new means of overcoming the drawbacks of traditional layer-by-layer dip coating through the use of polyelectrolyte complexes (PECs) and electrophoretic deposition. The layer-by-layer process, by which oppositely charged polyelectrolytes or other charged particle are alternately adsorbed onto a substrate to produce a thin film of precisely controllable thickness, is versatile and simple to implement but suffers from requiring numerous, long deposition steps to produce uniform micron thick films. PECs are small associations of oppositely charged polyelectrolytes that, when mixed in non-stoichiometric ratios, can form charged water- soluble particles. There is much still to be determined about the phase behavior of PECs. However, it has been shown that they can exist over a range of conditions. Electrophoretic deposition is a technique used in many commercial applications for the deposition of charged particles onto a conducting substrate. It has even been shown to enhance the deposition of polyelectrolyte single layers and multilayers. This study examines the phase behavior of PECs made of linear poly(ethyleneimine) (LPEI) and poly(acrylic acid) (PAA). PEC behavior is studied over a pH range of 4.0 to 6.0, with no salt added to the system. This study also reports the results of tests examining how soluble PECs responded to changes in pH and whether solid PECs could be made to dissolve through the addition of different salts. Light scattering is used to examine the particle size distribution and effective diameter of PECs in solution. This information is then used to electrophoretically deposit PECs with 10%, 30%, 70%, and 90% excess LPEI. Stylus profilometry is used to assess the thickness of deposited films. The results showing that PEC layers deposited under an applied voltage were 40% to 400% thicker than PECs deposited with no applied potential. Advisors/Committee Members: Zacharia, Nicole S. (advisor), Grunlan, Jaime (committee member), Lutkenhaus, Jodie (committee member).

Subjects/Keywords: Polyelectrolyte; electrophoretic; layer-by-layer

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APA (6^th Edition):

Davis, R. (2013). Phase Behavior and Electrophoretic Deposition of LPEI-PAA Polyelectrolyte Complexes. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149587

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):

Davis, Ryan. “Phase Behavior and Electrophoretic Deposition of LPEI-PAA Polyelectrolyte Complexes.” 2013. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/149587.

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

MLA Handbook (7^th Edition):

Davis, Ryan. “Phase Behavior and Electrophoretic Deposition of LPEI-PAA Polyelectrolyte Complexes.” 2013. Web. 20 Oct 2019.

Vancouver:

Davis R. Phase Behavior and Electrophoretic Deposition of LPEI-PAA Polyelectrolyte Complexes. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/149587.

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

Council of Science Editors:

Davis R. Phase Behavior and Electrophoretic Deposition of LPEI-PAA Polyelectrolyte Complexes. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149587

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

Texas A&M University

2. Jang, Woo-Sik. Layer-by-Layer Assembly of Clay-filled Polymer Nanocomposite Thin Films.

Degree: 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-116

► A variety of functional thin films can be produced using the layer-by-layer assembly technique. In this work, assemblies of anionic clay and cationic polymer were… (more)

Subjects/Keywords: Layer-by-Layer; Clay; Oxygen Transmission Rate

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APA (6^th Edition):

Jang, W. (2010). Layer-by-Layer Assembly of Clay-filled Polymer Nanocomposite Thin Films. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-116

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):

Jang, Woo-Sik. “Layer-by-Layer Assembly of Clay-filled Polymer Nanocomposite Thin Films.” 2010. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-116.

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

MLA Handbook (7^th Edition):

Jang, Woo-Sik. “Layer-by-Layer Assembly of Clay-filled Polymer Nanocomposite Thin Films.” 2010. Web. 20 Oct 2019.

Vancouver:

Jang W. Layer-by-Layer Assembly of Clay-filled Polymer Nanocomposite Thin Films. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-116.

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

Council of Science Editors:

Jang W. Layer-by-Layer Assembly of Clay-filled Polymer Nanocomposite Thin Films. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-116

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

Texas A&M University

3. Puhr, Joseph Timothy. The Effect of Nanoparticles on the Thermal Transitions of Hydrated Layer-by-Layer Assemblies.

Degree: 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/152854

► Nanoparticles can have a profound effect on a polymer?s glass transition temperature (T_(g)). Many layer-by-layer (LbL) assemblies contain nanoparticles for added functionality, but the resulting… (more)

Subjects/Keywords: Glass Transition; Layer-by-Layer Assembly

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APA (6^th Edition):

Puhr, J. T. (2014). The Effect of Nanoparticles on the Thermal Transitions of Hydrated Layer-by-Layer Assemblies. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152854

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):

Puhr, Joseph Timothy. “The Effect of Nanoparticles on the Thermal Transitions of Hydrated Layer-by-Layer Assemblies.” 2014. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/152854.

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

MLA Handbook (7^th Edition):

Puhr, Joseph Timothy. “The Effect of Nanoparticles on the Thermal Transitions of Hydrated Layer-by-Layer Assemblies.” 2014. Web. 20 Oct 2019.

Vancouver:

Puhr JT. The Effect of Nanoparticles on the Thermal Transitions of Hydrated Layer-by-Layer Assemblies. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/152854.

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

Council of Science Editors:

Puhr JT. The Effect of Nanoparticles on the Thermal Transitions of Hydrated Layer-by-Layer Assemblies. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152854

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

Texas A&M University

4. Huang, Xiayun. Assembly and Physico-Chemical Properties of Polyelectrolyte Multilayer Films Co-Assembled with Guest Species.

Degree: 2014, Texas A&M University

URL: http://hdl.handle.net/1969.1/153213

► Polyelectrolyte multilayer (PEM) films are typically made of two oppositely charged polyelectrolytes held together by electrostatic interactions. PEM films embedded with guest species, that is… (more)

Subjects/Keywords: Polyelectrolyte; Guest Species; Layer-by-Layer Assembly

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APA (6^th Edition):

Huang, X. (2014). Assembly and Physico-Chemical Properties of Polyelectrolyte Multilayer Films Co-Assembled with Guest Species. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153213

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, Xiayun. “Assembly and Physico-Chemical Properties of Polyelectrolyte Multilayer Films Co-Assembled with Guest Species.” 2014. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/153213.

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, Xiayun. “Assembly and Physico-Chemical Properties of Polyelectrolyte Multilayer Films Co-Assembled with Guest Species.” 2014. Web. 20 Oct 2019.

Vancouver:

Huang X. Assembly and Physico-Chemical Properties of Polyelectrolyte Multilayer Films Co-Assembled with Guest Species. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/153213.

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

Council of Science Editors:

Huang X. Assembly and Physico-Chemical Properties of Polyelectrolyte Multilayer Films Co-Assembled with Guest Species. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153213

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

Université Catholique de Louvain

5. Hubert, Julien. L’utilisation de complexes protéine-polyélectrolytes pour l’immobilisation d’anticorps à l’aide de la méthode Layer-by-Layer.

Degree: 2018, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/thesis:14931

►

La fonctionnalisation de la surface de matériaux avec des protéines est un enjeu crucial pour de nombreux domaines comme la biocatalyse ou les sciences biomédicales.… (more)

▼

La fonctionnalisation de la surface de matériaux avec des protéines est un enjeu crucial pour de nombreux domaines comme la biocatalyse ou les sciences biomédicales. Parmi la multitude de méthodes existante, la technique de déposition Layer-by-Layer (LbL), développée vers la fin du 20ème siècle, permet de construire des films multicouches en condition aqueuse quel que soit le matériaux, sa géométrie ou sa chimie de surface. Cette technique se base sur l’adsorption alternée de polyélectrolytes (PE) négatifs et positifs. En remplaçant l’un des deux PE par une protéine, une multicouche constituée d’une alternance de protéine de de PE peut être obtenue. Cependant, les protéines sont des polyampholytes et la présence de charges positives et négatives ne permet pas toujours une interaction éléctrostatique favorable. Il a donc été proposé récemment de créer des complexes protéine-polyélectrolyte (PPCs) afin de standardiser la charge de la protéine. Ces complexes peuvent ensuite être immobilisés dans une multicouche par adsorption alternée avec un PE. Nous avons donc utilisé cette technique afin d’immobiliser un anticorps et un peptide anti-microbien sur un pansement Tegaderm® 3M. L’anticorps anti-insuline humaine (DS1) a été utilisé comme modèle de l’anti-TNF-α qui permet de lutter contre l’inflammation chronique, tandis que le peptide utilisé est le LL37. DS1 a été complexé avec du chitosan, un polycation faible (PPCS_Ab), et LL37 a été complexé avec de l’alginate, un polyanion faible (PPCs_LL37). Les PPCs_Ab et PPCs_LL37 ont été caractérisés par turbidimétrie et potentiel zeta. Ils ont ensuite été adsorbés alternativement l’un avec l’autre pour former une multicouche épaisse et fortement hydratée. Il apparaît que l’adsorption de PPCs est plus importante lorsqu’elle se fait sur une autre couche de PPCs plutôt sur des PEs. De plus, les analyses par microscopie à force atomique (AFM) révèlent une rugosité importante du film qui permettra un contact élevé entre le coating du pansement et les tissus biologiques. Des mesures par spectrométrie des photos à rayons X (XPS), ainsi qu’une série de dosages protéiques (o-phthalaldéhyde (OPH) et acide bicinchoninique (BCA)) suggèrent qu’un total d’environ 6,5 µg de protéine a été immobilisé après 3 bicouches sur un pansement de 3 cm2. Ce travail a donc permis de mettre en place une méthode pour fonctionnaliser un pansement avec deux protéines différentes. Des tests de relargage et in vivo doivent donc être réalisé pour juger de son efficacité à combattre l’inflammation et réduire les infections.

Master [120] : bioingénieur en chimie et bioindustries, Université catholique de Louvain, 2018

Advisors/Committee Members: UCL - Faculté des bioingénieurs, Dupont-Gillain, Christine C., vander Straten, Aurélien.

Subjects/Keywords: Layer-by-Layer; Protéines; Polyélectrolytes; QCM; Pansements

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APA (6^th Edition):

Hubert, J. (2018). L’utilisation de complexes protéine-polyélectrolytes pour l’immobilisation d’anticorps à l’aide de la méthode Layer-by-Layer. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/thesis:14931

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):

Hubert, Julien. “L’utilisation de complexes protéine-polyélectrolytes pour l’immobilisation d’anticorps à l’aide de la méthode Layer-by-Layer.” 2018. Thesis, Université Catholique de Louvain. Accessed October 20, 2019. http://hdl.handle.net/2078.1/thesis:14931.

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

MLA Handbook (7^th Edition):

Hubert, Julien. “L’utilisation de complexes protéine-polyélectrolytes pour l’immobilisation d’anticorps à l’aide de la méthode Layer-by-Layer.” 2018. Web. 20 Oct 2019.

Vancouver:

Hubert J. L’utilisation de complexes protéine-polyélectrolytes pour l’immobilisation d’anticorps à l’aide de la méthode Layer-by-Layer. [Internet] [Thesis]. Université Catholique de Louvain; 2018. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/2078.1/thesis:14931.

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

Council of Science Editors:

Hubert J. L’utilisation de complexes protéine-polyélectrolytes pour l’immobilisation d’anticorps à l’aide de la méthode Layer-by-Layer. [Thesis]. Université Catholique de Louvain; 2018. Available from: http://hdl.handle.net/2078.1/thesis:14931

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

University of Southern California

6. Martinez, Kristin Leigh Mutolo. New materials and fabrication techniques and their utilization in organic photovoltaic devices.

Degree: PhD, Chemistry, 2009, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/241770/rec/4393

► This work has two distinct, but similar, objectives. Both objectives relate directly to improved understanding and performance of organic photovoltaics (OPVs). The first projects objective… (more)

▼ This work has two distinct, but similar, objectives. Both objectives relate directly to improved understanding and performance of organic photovoltaics (OPVs). The first projects objective is to address the origin of the Voc in order to improve device performance through the use of a family of new materials, Subphthalocyanines. The second projects objective is to implement an alternative device fabrication technique (Layer-by-Layer deposition) with the goal of improving device performance by controlling the architecture of a bulk heterojunction OPV.; Subphthalocyanines exhibit strong absorption in the visible region and extinction coefficients similar to that of copper phthalocyanine (CuPc). Oxidation and reduction potentials of subphthalocyanines indicate they may be a suitable donor-like material in OPV cells employing C60 as the acceptor-like material. A double heterostructure OPV cell has been fabricated using boron subphthalocyanine chloride (SubPc) as the donor-like material and C60 as the acceptor-like material. The SubPc/C60 cell showed a more than doubling of Voc compared to a conventional CuPc/C60 cell under 1 sun AM1.5G simulated illumination. The substantial increase in Voc is attributed to an increase in the energy difference between the lowest unoccupied molecular orbital (LUMO) of the acceptor-like material and the highest occupied molecular orbital (HOMO) of the donor-like material (referred to as the interface gap, Ig). In addition, peripheral substitution of SubPc has been shown to alter the reduction and oxidation potentials of the material, which, in turn, alters the HOMO and LUMO energies. Incorporating the substituted SubPcs as the donor-like or acceptor-like materials in PV cells should allow us to vary the value of Ig and further explore the significance of Ig on Voc.; Layer-by-Layer (LbL) deposition utilizes electrostatic interactions of charged polyelectrolytes to grow thin-film multilayers. This deposition process allows for greater control of the thin film architecture compared to spin cast deposition or thermal evaporation methods, thereby making it an attractive technique for fabrication of OPV devices. There are a few factors that affect the growth of the multilayer thin-films: polyelectrolyte solution concentration, dipping time, and the pH of the polyelectrolyte solution. The goals of this work were to understand the growth regimes of the thin films under different growth conditions and utilize the LbL deposition method to fabricate OPV devices. Advisors/Committee Members: Thompson, Mark E. (Committee Chair), Haw, James (Committee Member), Haas, Stephan (Committee Member), Weber, William P. (Committee Member), Bau, Robert (Committee Member).

Subjects/Keywords: organic photovoltaics; subphthalocyanine; layer-by-layer

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APA (6^th Edition):

Martinez, K. L. M. (2009). New materials and fabrication techniques and their utilization in organic photovoltaic devices. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/241770/rec/4393

Chicago Manual of Style (16^th Edition):

Martinez, Kristin Leigh Mutolo. “New materials and fabrication techniques and their utilization in organic photovoltaic devices.” 2009. Doctoral Dissertation, University of Southern California. Accessed October 20, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/241770/rec/4393.

MLA Handbook (7^th Edition):

Martinez, Kristin Leigh Mutolo. “New materials and fabrication techniques and their utilization in organic photovoltaic devices.” 2009. Web. 20 Oct 2019.

Vancouver:

Martinez KLM. New materials and fabrication techniques and their utilization in organic photovoltaic devices. [Internet] [Doctoral dissertation]. University of Southern California; 2009. [cited 2019 Oct 20]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/241770/rec/4393.

Council of Science Editors:

Martinez KLM. New materials and fabrication techniques and their utilization in organic photovoltaic devices. [Doctoral Dissertation]. University of Southern California; 2009. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/241770/rec/4393

Clemson University

7. Conrad, Catherine Alexis. Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly.

Degree: MS, Chemistry, 2018, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/2829

► Three different series of diphosphonium polymers were synthesized in order to analyze the supramolecular assembly of these polyelectrolytes with varying polyanions. Variation of the rigidity… (more)

▼ Three different series of diphosphonium polymers were synthesized in order to analyze the supramolecular assembly of these polyelectrolytes with varying polyanions. Variation of the rigidity of the spacer between the phosphonium units determined that flexibility leads to increased absorption and consistency to film growth when observed through layer-by-layer assembly with UV-vis spectroscopy and atomic force microscopy. With the flexible ethylene spacer, films formed linearly up to 800 bilayers thick. An additional series of xylene based flexible diphosphonium polymers were synthesized with increasing numbers of methylene unit spacers. Analysis of materials was conducted through thermogravimetric analysis, X-ray crystallography, and layer-by-layer analysis tracked with UV-vis spectroscopy and atomic force microscopy. Consistency of film formation was dependent on even or odd number of the methylene spacer. Odd numbered methylene spacers lead to more consistent film growth with greater polythiophene deposition. Another series of polyelectrolytes were generated with the same methylene spacers, but with octyloxy units branching from the backbone to explore the influence of increased hydrophobicity on the previous study. Similar characterization was done with the addition of dip-cast films analyzed for critical surface energy and antimicrobial activity. The thermal stability of the octyloxy series was lower than their xylene counterparts and also demonstrated less dependence on the inter-ion spacing in the film growth formation. Extensive studies on the solvent systems for casting both the layer-by-layer films as well as the dip-cast films elucidated the high dependence and tune ability of these films by solvent systems. The presence of the hydrophobic side chain lead to an increased antibacterial activity especially when interacting with the gram-positive Staphylococcus aureus. Advisors/Committee Members: Dr. Rhett C. Smith, Committee Chair, Dr. Andrew Tennyson, Dr. Julia Brumaghim.

Subjects/Keywords: Film formation; Layer-by-layer; Phosphonium; Polyelectrolytes

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APA (6^th Edition):

Conrad, C. A. (2018). Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2829

Chicago Manual of Style (16^th Edition):

Conrad, Catherine Alexis. “Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly.” 2018. Masters Thesis, Clemson University. Accessed October 20, 2019. https://tigerprints.clemson.edu/all_theses/2829.

MLA Handbook (7^th Edition):

Conrad, Catherine Alexis. “Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly.” 2018. Web. 20 Oct 2019.

Vancouver:

Conrad CA. Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly. [Internet] [Masters thesis]. Clemson University; 2018. [cited 2019 Oct 20]. Available from: https://tigerprints.clemson.edu/all_theses/2829.

Council of Science Editors:

Conrad CA. Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly. [Masters Thesis]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_theses/2829

Université Catholique de Louvain

8. Mauquoy, Sara. Fibronectin and collagen-based biomimetic surfaces to improve cell-material interactions for biomedical applications.

Degree: 2016, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/182146

►

The lack of donors for grafts has led to the development of new strategies, based on biomaterials and tissue engineering. For both approaches, a key… (more)

▼

The lack of donors for grafts has led to the development of new strategies, based on biomaterials and tissue engineering. For both approaches, a key challenge is the control of cell-material interactions, which can be addressed by modifying the physical and/or chemical properties of material surfaces. A biomimetic way to do it is the adsorption of molecules from the extracellular matrix. In this work, two proteins, collagen (Col) and fibronectin (Fn), were chosen as building blocks to create well-organized biointerfaces to improve interactions with cells. To design biomimetic surfaces, layer-by-layer (LbL) deposition was compared to simultaneous adsorption of both proteins. The influence of the buffer composition, of a polyethyleneimine anchoring layer and of collagen denaturation on LbL assembly was studied. The results showed that true LbL building was not obtained by assembly of Col and Fn. However, multilayers were built and results showed that an anchoring layer allowed thicker films to be obtained, and that Hepes buffer allowed obtaining the most regular assembly. Moreover, comparison with simultaneous adsorption revealed interesting features. Films obtained by simultaneous adsorption were of the same thickness, or even thicker than those prepared by LbL, and they presented a different morphology, with more Col fibrils and a lower contact angle. Adipose derived mesenchymal stem cells were cultured on films obtained by both deposition methods, in Hepes, with or without anchoring layer. All the protein films supported cell adhesion and growth better than pure polystyrene. The main influence observed on cells was the one of the anchoring layer, which decreased proliferation rate but improved osteogenic differentiation. Biointerfaces were thus designed based on Col and Fn which influence cell behavior. It may open the way to new strategies for tissue engineering applications.

(AGRO - Sciences agronomiques et ingénierie biologique) – UCL, 2016

Advisors/Committee Members: UCL - SST/IMCN/BSMA - Bio and soft matter, UCL - Ingénierie biologique, agronomique et environnementale, Dupont, Christine, Demoustier, Sophie, Knoops, Bernard, Lansoulsi, Jessem, Pauthe, Emmanuel, Gaigneaux, Eric.

Subjects/Keywords: Fibronectin; Collagen; Layer-by-layer; Biomimetic interfaces

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APA (6^th Edition):

Mauquoy, S. (2016). Fibronectin and collagen-based biomimetic surfaces to improve cell-material interactions for biomedical applications. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/182146

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):

Mauquoy, Sara. “Fibronectin and collagen-based biomimetic surfaces to improve cell-material interactions for biomedical applications.” 2016. Thesis, Université Catholique de Louvain. Accessed October 20, 2019. http://hdl.handle.net/2078.1/182146.

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

MLA Handbook (7^th Edition):

Mauquoy, Sara. “Fibronectin and collagen-based biomimetic surfaces to improve cell-material interactions for biomedical applications.” 2016. Web. 20 Oct 2019.

Vancouver:

Mauquoy S. Fibronectin and collagen-based biomimetic surfaces to improve cell-material interactions for biomedical applications. [Internet] [Thesis]. Université Catholique de Louvain; 2016. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/2078.1/182146.

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

Council of Science Editors:

Mauquoy S. Fibronectin and collagen-based biomimetic surfaces to improve cell-material interactions for biomedical applications. [Thesis]. Université Catholique de Louvain; 2016. Available from: http://hdl.handle.net/2078.1/182146

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

Texas A&M University

9. Selin, Viktar. Chain Dynamics And Layering Within Polyelectrolyte Multilayer Films.

Degree: PhD, Materials Science and Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/174333

► The current study is focused on understanding main factors affecting dynamics of polymer chains included within layer-by-layer (LbL) films and impact of chain dynamics on… (more)

▼ The current study is focused on understanding main factors affecting dynamics of polymer chains included within layer-by-layer (LbL) films and impact of chain dynamics on film structure. LbL films, or polyelectrolyte multilayers (PEMs), can be deposited on a variety of substrates such as silicon, glass, plastics, and metals via alternating adsorption of oppositely charged polymers. Modification of surfaces with LbL films impart the substrates with new properties and functionalities, such as controlled wettability and uptake of water or capability to retain and/or controllably release small molecules. For many applications of PEMs, specifically for constructing multifunctional films for sequential, multi-step delivery of bioactive compounds, it is critically important to understand and control film structure. There are two possible modes of the PEM growth: linear growth, with a small, constant increase in the film thickness at each dipping step (lPEMs), and non-linear growth, with per-cycle film mass increasing with the number of deposited layers (nlPEMs). PEMs can switch between linear and non-linear film growth as a function of pH, temperature, or number of deposited layers. My goal was to relate polyelectrolyte chain mobility to the mechanism of PEM film growth and to establish the origin of transitions between linear and non-linear growth regimes. This goal was accomplished in experiments which allowed direct observation of chain displacements and PEM structural evolution upon exposure of these films to solutions at varied pH and ionic strength. My findings widen the fundamental knowledge about the mechanism of LbL growth and can be used for developing theories and modeling of PEM films. Moreover, these results can be useful in designing polyelectrolyte nanoassemblies for biomedical applications, such as drug delivery coatings for medical implants or tissue engineering matrices. Advisors/Committee Members: Sukhishvili, Svetlana (advisor), Lutkenhaus, Jodie (committee member), Elabd, Yossef (committee member), Cheng, Zhengdong (committee member).

Subjects/Keywords: polyelectrolytes; multilayers; layer-by-layer; dynamics

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

APA (6^th Edition):

Selin, V. (2018). Chain Dynamics And Layering Within Polyelectrolyte Multilayer Films. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174333

Chicago Manual of Style (16^th Edition):

Selin, Viktar. “Chain Dynamics And Layering Within Polyelectrolyte Multilayer Films.” 2018. Doctoral Dissertation, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/174333.

MLA Handbook (7^th Edition):

Selin, Viktar. “Chain Dynamics And Layering Within Polyelectrolyte Multilayer Films.” 2018. Web. 20 Oct 2019.

Vancouver:

Selin V. Chain Dynamics And Layering Within Polyelectrolyte Multilayer Films. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/174333.

Council of Science Editors:

Selin V. Chain Dynamics And Layering Within Polyelectrolyte Multilayer Films. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174333

University of Akron

10. Cheng, Kuan. Magnet-assisted Layer-by-layer Assembly on Nanoparticles Based on 3D-printed Microfluidic Devices.

Degree: MS, Polymer Science, 2019, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1554984796295339

► The synthesis of core/shell structure nanoparticles based on the layer-by-layer assembly approach is potentially interesting for both biomedical and material engineering areas. Conventional methods face… (more)

Subjects/Keywords: Polymers; Layer-by-layer; 3D-printing; Microfluidic

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APA (6^th Edition):

Cheng, K. (2019). Magnet-assisted Layer-by-layer Assembly on Nanoparticles Based on 3D-printed Microfluidic Devices. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1554984796295339

Chicago Manual of Style (16^th Edition):

Cheng, Kuan. “Magnet-assisted Layer-by-layer Assembly on Nanoparticles Based on 3D-printed Microfluidic Devices.” 2019. Masters Thesis, University of Akron. Accessed October 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1554984796295339.

MLA Handbook (7^th Edition):

Cheng, Kuan. “Magnet-assisted Layer-by-layer Assembly on Nanoparticles Based on 3D-printed Microfluidic Devices.” 2019. Web. 20 Oct 2019.

Vancouver:

Cheng K. Magnet-assisted Layer-by-layer Assembly on Nanoparticles Based on 3D-printed Microfluidic Devices. [Internet] [Masters thesis]. University of Akron; 2019. [cited 2019 Oct 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1554984796295339.

Council of Science Editors:

Cheng K. Magnet-assisted Layer-by-layer Assembly on Nanoparticles Based on 3D-printed Microfluidic Devices. [Masters Thesis]. University of Akron; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1554984796295339

University of Wollongong

11. Sangian, Danial. Optimisation of the layer-by-layer synthesis method for polypyrrole actuators.

Degree: Master of Engineering - Research, 2012, University of Wollongong

URL: ; https://ro.uow.edu.au/theses/3660

► Electrochemical actuators based on conducting polymers are being developed for many applications because of their significant advantages such as low voltage operation, relatively easy… (more)

Subjects/Keywords: actuators; polypyrrole; layer by layer synthesis method

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

APA (6^th Edition):

Sangian, D. (2012). Optimisation of the layer-by-layer synthesis method for polypyrrole actuators. (Masters Thesis). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/3660

Chicago Manual of Style (16^th Edition):

Sangian, Danial. “Optimisation of the layer-by-layer synthesis method for polypyrrole actuators.” 2012. Masters Thesis, University of Wollongong. Accessed October 20, 2019. ; https://ro.uow.edu.au/theses/3660.

MLA Handbook (7^th Edition):

Sangian, Danial. “Optimisation of the layer-by-layer synthesis method for polypyrrole actuators.” 2012. Web. 20 Oct 2019.

Vancouver:

Sangian D. Optimisation of the layer-by-layer synthesis method for polypyrrole actuators. [Internet] [Masters thesis]. University of Wollongong; 2012. [cited 2019 Oct 20]. Available from: ; https://ro.uow.edu.au/theses/3660.

Council of Science Editors:

Sangian D. Optimisation of the layer-by-layer synthesis method for polypyrrole actuators. [Masters Thesis]. University of Wollongong; 2012. Available from: ; https://ro.uow.edu.au/theses/3660

12. Ilyas, Shazia. Multicouches multifonctionnelles de polyelectrolytes pour des applications en filtration membranaire : Multifunctional weak polyelectrolyte multilayers for membrane applications.

Degree: Docteur es, Génie des procédés et de l'environnement, 2017, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2017TOU30386

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Dans ce travail, nous démontrons que la technique de dépôt multicouche dite layer by layer (LbL) est une technique polyvalente où les propriétés des multicouches… (more)

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Dans ce travail, nous démontrons que la technique de dépôt multicouche dite layer by layer (LbL) est une technique polyvalente où les propriétés des multicouches telles que l'épaisseur, la charge et la densité peuvent être facilement contrôlées par le choix des polyélectrolytes (PE), le nombre d'étapes et les conditions de dépôt (pH, force ionique, etc.). Nous démontrons que des multicouches de PE faible (PAH / PAA) peuvent être utilisées pour fournir une double fonction aux membranes (PEM) en tant que couche de séparation NF et comme revêtement sacrificiel permettant un nettoyage facile de la membrane. Ces membranes à base de PEM montrent des performances de rejet des solutés dans une gamme typique des membranes NF, c'est-à-dire rejetant peu les ions monovalents (NaCl) (<24%), tout en rejetant> 60% de l'ion divalent SO42- et la molécule organique neutre sulfaméthoxazole (SMX). Par un rinçage et un lavage à contre-courant à basse pression avec une solution stimuli appropriée, nous obtenons un nettoyage sacrificiel réussi d'une membrane colmatée, ce qui ramène la résistance d'une membrane colmatée à celle de la membrane vierge. Après un nouveau dépôt sur la membrane avec le même système PEM, la résistance de la membrane est égale à la résistance du PEM d'origine, ce qui démontre la réutilisation de cette approche. Le mécanisme de rejet des membranes étudiées s'est révélé principalement déterminé par l'exclusion stérique mais aussi par l'exclusion de Donnan. Nous avons étudié notre système PEM pour préparer des membranes pour des applications de nanofiltration résistant aux solvants (SRNF). Des membranes de SRNF avec une couche de séparation de PEM ont été préparées sur un support UF de polyacrylonitrile hydrolysé (PAN-H). Les résultats de cette étude montrent une manière simple et polyvalente d'utiliser le pH pendant le revêtement pour régler les performances de la membrane pour une application SRNF spécifique. Afin d'amener l'approche PEM et du nettoyage sacrificiel à leur maturité et de modifier des modules existants, nous avons simplifié la procédure LbL pour des membranes fibres creuses en utilisant un "dépôt dynamique" ou un "dépôt actif" qui consiste à rincer les solutions du PE à travers le canal interne de la membrane fibre creuse. Cette méthode de dépôt avec sa reproductibilité et son homogénéité permet de revêtir les modules de membrane UF existants.

In this work, we demonstrate that layer by layer (LbL) is a versatile technique where control over multilayer properties such as thickness, charge and density, can be easily achieved simply by the choice of polyelectrolytes, number of coating steps and coating conditions (pH, ionic strength etc.). We demonstrate that multilayers of weak PEs (PAH/PAA) can be used to provide a dual function to membranes (PEM) i.e., as NF separation layer and as a sacrificial coating that allows easy membrane cleaning. These PEM based membranes, shows rejection performance of solutes in a range typical for NF membranes i.e., hardly rejecting monovalent ions (NaCl) (<24%), while…

Advisors/Committee Members: Aimar, Pierre (thesis director), Lahitte, Jean-François (thesis director).

Subjects/Keywords: Membrane; Filtration; Layer by layer; Couche sacrificielle; Résistance au solvant; NF; Layer by layer; Sacrificial layer; Solvent resistant; NF

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

APA (6^th Edition):

Ilyas, S. (2017). Multicouches multifonctionnelles de polyelectrolytes pour des applications en filtration membranaire : Multifunctional weak polyelectrolyte multilayers for membrane applications. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2017TOU30386

Chicago Manual of Style (16^th Edition):

Ilyas, Shazia. “Multicouches multifonctionnelles de polyelectrolytes pour des applications en filtration membranaire : Multifunctional weak polyelectrolyte multilayers for membrane applications.” 2017. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed October 20, 2019. http://www.theses.fr/2017TOU30386.

MLA Handbook (7^th Edition):

Ilyas, Shazia. “Multicouches multifonctionnelles de polyelectrolytes pour des applications en filtration membranaire : Multifunctional weak polyelectrolyte multilayers for membrane applications.” 2017. Web. 20 Oct 2019.

Vancouver:

Ilyas S. Multicouches multifonctionnelles de polyelectrolytes pour des applications en filtration membranaire : Multifunctional weak polyelectrolyte multilayers for membrane applications. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2017. [cited 2019 Oct 20]. Available from: http://www.theses.fr/2017TOU30386.

Council of Science Editors:

Ilyas S. Multicouches multifonctionnelles de polyelectrolytes pour des applications en filtration membranaire : Multifunctional weak polyelectrolyte multilayers for membrane applications. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2017. Available from: http://www.theses.fr/2017TOU30386

13. Mauroy, Cyprien. Films multicouches nanocristaux de cellulose/Ge-Imogolite pour l'élaboration de nouveaux matériaux nanoporeux : Elaboration of cellulose nanocrystal/Ge-imogolite multilayered thin film to design new nanoporous materials.

Degree: Docteur es, Géosciences de l'environnement, 2017, Aix Marseille Université

URL: http://www.theses.fr/2017AIXM0265

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Lors des dix dernières années, les films multicouches ont suscité l’intérêt de la communauté scientifique pour leurs propriétés innovantes. Principalement issus de l’association de polyélectrolytes… (more)

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Lors des dix dernières années, les films multicouches ont suscité l’intérêt de la communauté scientifique pour leurs propriétés innovantes. Principalement issus de l’association de polyélectrolytes et/ou de nanoparticules de différentes morphologies, ils ont ouvert la voie à la fabrication d’une nouvelle catégorie de matériaux nanoporeux, possédant des propriétés optiques attractives telles que la coloration structurale et l’antireflet. Les films multicouches à base de deux nanoparticules de charges opposées sont plus rares et permettent de jumeler les propriétés des deux nanoparticules utilisées et d’en faire émerger de nouvelles. Dans cette étude, nous nous sommes intéressés à deux nanoparticules anisotropes, de facteurs d’aspects contrôlés et respectivement bio/geosourcées : les nanocristaux de cellulose (NCC) et des nanotubes d’imogolite. Le but de cette étude est d’étudier la possibilité de créer un film multicouche bio-géo inspiré à base de ces deux nanoparticules par immersion et d’en étudier les propriétés optiques. Dans un premier temps, nous avons comparé les films multicouches NCC/Ge-imogolites à ceux plus communément décrits dans la littérature, à savoir, des films à base de NCC ou d’imogolite associés à un polyélectrolyte de charge opposée. Les différents paramètres de trempage comme le temps d’immersion et la force ionique de la suspension ont été variés afin d’obtenir une densité de film optimale. Pour finir la porosité des films et leur comportement dans l’eau ont été étudiés par QCM-D, ainsi que leurs propriétés optiques par mesure de transmittance.

In the past decade, multilayer thin films drew the scientific community attention for their unique properties. Indeed, principally made of an association of polyelectrolytes and/or nanoparticles, of various morphologies and chemistries, they allow the design of a range of porous nanomaterials with unique optical properties, such as structural colors or anti-reflectivity. Less commonly described, thin films made of two nanoparticles of opposite charges are gaining interest since they combine the properties of the two nanoparticles used, and generate new ones through their association. In this study, multilayer coatings were formed through the association of two anisotropic oppositely charged nanorods of well-controlled aspect ratio, i.e. bio-based anionic cellulose nanocrystals (CNC) and geo-based cationic Imogolites. This study deals with the feasibility to create a bio-geo-inspired multilayer thin film based on these two nanoparticles by dipping and characterize their optical properties. Firstly, elaboration of multilayered thin films from CNC and Ge-Imogolites nanorods, were studied in comparison with reference films incorporating CNC or Imogolites with polyelectrolytes bearing opposite charges of the nanorods. Multilayered thin films were assembled by the dipping procedure and various parameters (adsorption time, ionic strength, etc.) were varied to investigate the optimal density for the film. To finish, film porosities were investigated using…

Advisors/Committee Members: Rose, Jérôme (thesis director), Levard, Clément (thesis director), Cathala, Bernard (thesis director).

Subjects/Keywords: Nanomateriaux; Nanocristaux de cellulose; Imogolite; Film mince; Layer-By-Layer; Porosité; Nanomaterial; Cellulose nanocrystal; Imogolite; Thin film; Layer-By-Layer; Porosity

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

APA (6^th Edition):

Mauroy, C. (2017). Films multicouches nanocristaux de cellulose/Ge-Imogolite pour l'élaboration de nouveaux matériaux nanoporeux : Elaboration of cellulose nanocrystal/Ge-imogolite multilayered thin film to design new nanoporous materials. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2017AIXM0265

Chicago Manual of Style (16^th Edition):

Mauroy, Cyprien. “Films multicouches nanocristaux de cellulose/Ge-Imogolite pour l'élaboration de nouveaux matériaux nanoporeux : Elaboration of cellulose nanocrystal/Ge-imogolite multilayered thin film to design new nanoporous materials.” 2017. Doctoral Dissertation, Aix Marseille Université. Accessed October 20, 2019. http://www.theses.fr/2017AIXM0265.

MLA Handbook (7^th Edition):

Mauroy, Cyprien. “Films multicouches nanocristaux de cellulose/Ge-Imogolite pour l'élaboration de nouveaux matériaux nanoporeux : Elaboration of cellulose nanocrystal/Ge-imogolite multilayered thin film to design new nanoporous materials.” 2017. Web. 20 Oct 2019.

Vancouver:

Mauroy C. Films multicouches nanocristaux de cellulose/Ge-Imogolite pour l'élaboration de nouveaux matériaux nanoporeux : Elaboration of cellulose nanocrystal/Ge-imogolite multilayered thin film to design new nanoporous materials. [Internet] [Doctoral dissertation]. Aix Marseille Université 2017. [cited 2019 Oct 20]. Available from: http://www.theses.fr/2017AIXM0265.

Council of Science Editors:

Mauroy C. Films multicouches nanocristaux de cellulose/Ge-Imogolite pour l'élaboration de nouveaux matériaux nanoporeux : Elaboration of cellulose nanocrystal/Ge-imogolite multilayered thin film to design new nanoporous materials. [Doctoral Dissertation]. Aix Marseille Université 2017. Available from: http://www.theses.fr/2017AIXM0265

University of Utah

14. Mishra, Deepa. Effective nuclear delivery of therapeutic molecules.

Degree: PhD, Bioengineering, 2011, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/418/rec/804

► Many strides have been made towards utilizing gene therapy to treat genetic disorders in humans. Low gene expression and formulation stability during storage have hindered… (more)

▼ Many strides have been made towards utilizing gene therapy to treat genetic disorders in humans. Low gene expression and formulation stability during storage have hindered the use of nonviral carriers thus far. The purpose of this research was to develop a cationic PLGA-b-bPEI micelle-based delivery system to co-deliver genes and small therapeutic drugs to the cell nucleus that could also be lyophilized for long-term storage and reconstituted as needed by simply adding water. Several PLGA-b-bPEI copolymers were synthesized and characterized for their potential to form reconstitutable micelle-based gene therapeutic delivery systems that showed enhanced nuclear delivery over other current cationic nonviral delivery systems. The first section of this dissertation addresses the characterization of a reconstitutable charged polymeric micelle system to assess its suitability for gene therapeutics delivery. A PLGA-b-bPEI block copolymer was synthesized and characterized for buffering capacity, particle size, zeta potential, complexation ability, cytotoxicity, transfection efficiency and reporter gene expression, and retention of physicochemical and biological characteristics upon lyophilization and reconstitution. Results showed that micelles and micelle/pDNA complexes retained their physicochemical characteristics following lyophilization and reconstitution. Transfection levels were enhanced using reconstituted complexes compared to their fresh counterparts without significant cellular toxicity even with pDNA doses up to 20?g, and transfection increased linearly with increasing pDNA dose. The second section of this dissertation investigates the use of dexamethasone-loaded micelles for enhanced nuclear accumulation of a reporter gene. PLGA-b-bPEI polymers synthesized in the first section were used to prepare dexamethasone-loaded micelles and complexed with pDNA. Gene expression was significantly enhanced using dexamethasone-loaded micelle/pDNA complexes compared to blank micelle/pDNA complexes, particularly for complexation weight ratios less than 1. Dex-micelles achieved gene expression equivalent to the blank system using a fraction of the polymer (weight ratio 0.25 versus 1), indicating that dexamethasone increased nuclear accumulation of polyplexes. Gene expression was nearly equivalent to a bPEI control carrier, leading to future plans of co-loading the micelle system with other types of drugs and examining this system’s suitability for specific applications such as treating patients suffering from asthma or other inflammatory diseases where dexamethasone treatment could be additionally beneficial for its anti-inflammatory properties.

Subjects/Keywords: Dexamethasone; Gene delivery; Layer-by-layer; Micelle; PLGA; Polyethylenimine

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

APA (6^th Edition):

Mishra, D. (2011). Effective nuclear delivery of therapeutic molecules. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/418/rec/804

Chicago Manual of Style (16^th Edition):

Mishra, Deepa. “Effective nuclear delivery of therapeutic molecules.” 2011. Doctoral Dissertation, University of Utah. Accessed October 20, 2019. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/418/rec/804.

MLA Handbook (7^th Edition):

Mishra, Deepa. “Effective nuclear delivery of therapeutic molecules.” 2011. Web. 20 Oct 2019.

Vancouver:

Mishra D. Effective nuclear delivery of therapeutic molecules. [Internet] [Doctoral dissertation]. University of Utah; 2011. [cited 2019 Oct 20]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/418/rec/804.

Council of Science Editors:

Mishra D. Effective nuclear delivery of therapeutic molecules. [Doctoral Dissertation]. University of Utah; 2011. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/418/rec/804

University of Akron

15. Zhu, Geyunjian. FABRICATION OF SLIPPERY LIQUID-INFUSED POROUS SURFACES USING LAYER-BY-LAYER ASSEMBLY: TOWARDS MULTIFUNCTIONAL SURFACES AND FACILE FABRICATION PROCESSES.

Degree: MS, Polymer Engineering, 2018, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1518051453328934

► Slippery liquid-infused porous surfaces (SLIPS) are bioinspired omniphobic surfaces that use a very thin layer of lubricant locked within the surface micro/nano structure to repel… (more)

▼ Slippery liquid-infused porous surfaces (SLIPS) are bioinspired omniphobic surfaces that use a very thin layer of lubricant locked within the surface micro/nano structure to repel a variety of liquids. These surfaces could have a potential impact on a wide range of industries, including healthcare, food packaging, and automobile. In this master thesis, SLIPS are fabricated by the state-of-the-art layer-by-layer (LbL) assembly of polyelectrolytes. LbL assembly is a simple and fast thin film fabrication technique which is performed by sequential immersion of substrates into polyelectrolyte solutions. The studies presented here describe an effort to utilize LbL assembled polyelectrolyte multilayers (PEMs) to create multifunctional SLIPS and on developing novel LbL system in organic solvent to achieve a facile, fast, and scalable fabrication of SLIPS. A novel gel-infused slippery surface with a gelator containing lubricant is demonstrated. This surface exhibits temperature-dependent and gelator concentration-dependent water drop sliding properties. In some cases, this means temperature dependent transition from water pinning to water sliding surfaces. The robustness of the lubricant layer against wash, a big concern for SLIPS, is proved to be enhanced by the addition of gelator, and an optimal 0.5 weight % concentration of gelator in mineral oil is found to best preserve the surface properties under a moderate shear flow. In addition to making multifunctional SLIPS, a tremendous effort has been focused on developing novel fabrication methods for making SLIPS. LbL assembly of branched polyethylenimine and Nafion is performed with methanol as the solvent. Hierarchically rough and superhydrophobic surface is obtained directly without further modification on various substrates. The surface properties are shown to highly depend on the LbL assembly parameters, including deposition cycles, dipping time, rinsing time, and drying time between baths. The polyelectrolyte multilayers obtained with this method is infused with Krytox®100 to form SLIPS surfaces, which show excellent omniphobic, antifouling, self-cleaning, flexible, and optical properties. The new method not only simplifies the fabrication of SLIPS surfaces, but also provides useful insight for making LBL films with specific morphologies. Advisors/Committee Members: Zacharia, Nicole (Advisor), Vogt, Bryan (Committee Chair).

Subjects/Keywords: Polymers; Materials Science; layer-by-layer; SLIPS; wettability

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

APA (6^th Edition):

Zhu, G. (2018). FABRICATION OF SLIPPERY LIQUID-INFUSED POROUS SURFACES USING LAYER-BY-LAYER ASSEMBLY: TOWARDS MULTIFUNCTIONAL SURFACES AND FACILE FABRICATION PROCESSES. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1518051453328934

Chicago Manual of Style (16^th Edition):

Zhu, Geyunjian. “FABRICATION OF SLIPPERY LIQUID-INFUSED POROUS SURFACES USING LAYER-BY-LAYER ASSEMBLY: TOWARDS MULTIFUNCTIONAL SURFACES AND FACILE FABRICATION PROCESSES.” 2018. Masters Thesis, University of Akron. Accessed October 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1518051453328934.

MLA Handbook (7^th Edition):

Zhu, Geyunjian. “FABRICATION OF SLIPPERY LIQUID-INFUSED POROUS SURFACES USING LAYER-BY-LAYER ASSEMBLY: TOWARDS MULTIFUNCTIONAL SURFACES AND FACILE FABRICATION PROCESSES.” 2018. Web. 20 Oct 2019.

Vancouver:

Zhu G. FABRICATION OF SLIPPERY LIQUID-INFUSED POROUS SURFACES USING LAYER-BY-LAYER ASSEMBLY: TOWARDS MULTIFUNCTIONAL SURFACES AND FACILE FABRICATION PROCESSES. [Internet] [Masters thesis]. University of Akron; 2018. [cited 2019 Oct 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1518051453328934.

Council of Science Editors:

Zhu G. FABRICATION OF SLIPPERY LIQUID-INFUSED POROUS SURFACES USING LAYER-BY-LAYER ASSEMBLY: TOWARDS MULTIFUNCTIONAL SURFACES AND FACILE FABRICATION PROCESSES. [Masters Thesis]. University of Akron; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1518051453328934

16. Geraldo, Vananélia Pereira Nunes. Filmes nanoestruturados contendo lipossomos para liberação controlada do Ibuprofeno.

Degree: Mestrado, Ciência e Engenharia de Materiais, 2008, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-17062008-120210/ ;

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A liberação controlada de fármacos é um tópico importante para várias iniciativas em nanotecnologia devido ao possível impacto para a sociedade, com a criação de… (more)

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A liberação controlada de fármacos é um tópico importante para várias iniciativas em nanotecnologia devido ao possível impacto para a sociedade, com a criação de sistemas otimizados que garantam a liberação num sítio específico e a uma taxa controlada. Dentre os vários paradigmas de liberação controlada destaca-se o uso de lipossomos, uma vez que muitos fármacos e drogas podem ser transportados. Este trabalho descreve a fabricação de filmes automontados de lipossomos que incorporam o fármaco ibuprofeno. Os lipossomos foram preparados de dipalmitoil fosfatidil colina (DPPC), dipalmitoil fosfatidil glicerol (DPPG) e palmitoil-oleoil fosfatidil glicerol (POPG), cujas camadas foram alternadas por interações eletrostáticas com camadas do dendrímero PAMAM geração 4. Medidas de espalhamento dinâmico de luz indicaram que a incorporação do ibuprofeno tornou os lipossomos de DPPC e DPPG mais estáveis, com uma diminuição no diâmetro médio de 140 para 74 nm e 132 para 63nm, respectivamente. Ao contrário, os lipossomos de POPG ficaram menos estáveis, com aumento do diâmetro de 110 para 160 nm. A influência na estabilidade foi confirmada em medidas de microscopia de força atômica nos filmes automontados, que mostraram grande tendência à ruptura nos lipossomos de POPG com a incorporação de ibuprofeno. O crescimento dos filmes automontados foi investigado com espectroscopia de fluorescência e uma balança de cristal de quartzo. A intensidade da fluorescência devida ao ibuprofeno aumentou exponencialmente com o número de camadas depositadas, mas não por causa de uma crescente adsorção de ibuprofeno. Ao contrário, a quantidade de material adsorvido nas primeiras camadas aumentou inicialmente, mas depois diminuiu drasticamente após a 6ª. bicamada, e o filme praticamente pára de crescer a partir da 10ª. bicamada. Portanto, a grande fluorescência para filmes espessos deve ser associada a um ambiente favorável, que aumenta a emissão quântica do ibuprofeno. A liberação do ibuprofeno, estudada com medidas de fluorescência, é mais lenta quando incorporado em lipossomos. Em experimentos com uma membrana de diálise, notamos que o tempo de decaimento do ibuprofeno puro é 5,2 h, enquanto este tempo aumentou para 9,2 e 8 h para ibuprofeno encapsulado em lipossomos de DPPG e POPG, respectivamente. O ibuprofeno também foi liberado de filmes automontados contendo lipossomos de DPPG e POPG, o que é promissor para o uso em bandagens (patches).

Controlled drug delivery is a key issue in a number of nanotechnology endeavors owing to the large impact on society that may achieved if improved systems are created which allows for delivery at a specific target and with a controlled rate. Among the various paradigms employed in drug delivery, the use of liposomes is prominent because a variety of drug molecules can be carried. This work describes the fabrication of layer-by-layer (LbL) films made with liposomes incorporating ibuprofen. The liposomes were made with dipalmitoyl phosphatidyl choline (DPPC), dipalmitoyl phosphatidyl glycerol (DPPG) and…

Advisors/Committee Members: Oliveira Junior, Osvaldo Novais de.

Subjects/Keywords: Drug release; Filmes automontados; Layer-by-layer films; Liberação; Liposomes; Lipossomo

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APA (6^th Edition):

Geraldo, V. P. N. (2008). Filmes nanoestruturados contendo lipossomos para liberação controlada do Ibuprofeno. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/88/88131/tde-17062008-120210/ ;

Chicago Manual of Style (16^th Edition):

Geraldo, Vananélia Pereira Nunes. “Filmes nanoestruturados contendo lipossomos para liberação controlada do Ibuprofeno.” 2008. Masters Thesis, University of São Paulo. Accessed October 20, 2019. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-17062008-120210/ ;.

MLA Handbook (7^th Edition):

Geraldo, Vananélia Pereira Nunes. “Filmes nanoestruturados contendo lipossomos para liberação controlada do Ibuprofeno.” 2008. Web. 20 Oct 2019.

Vancouver:

Geraldo VPN. Filmes nanoestruturados contendo lipossomos para liberação controlada do Ibuprofeno. [Internet] [Masters thesis]. University of São Paulo; 2008. [cited 2019 Oct 20]. Available from: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-17062008-120210/ ;.

Council of Science Editors:

Geraldo VPN. Filmes nanoestruturados contendo lipossomos para liberação controlada do Ibuprofeno. [Masters Thesis]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/88/88131/tde-17062008-120210/ ;

University of Alberta

17. Xing, Xiao. Layer-by-layer assembly of multilayers on carbon surfaces and molecular electronic junctions.

Degree: MS, Department of Chemistry, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/4f16c354s

► In the research described in this thesis, two molecular layers were successfully anchored on carbon surfaces (pyrolyzed photoresist films, PPFs) sequentially through two independent approaches.… (more)

Subjects/Keywords: covalent multilayers; molecular electronic junction; layer-by-layer assembly

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APA (6^th Edition):

Xing, X. (2010). Layer-by-layer assembly of multilayers on carbon surfaces and molecular electronic junctions. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/4f16c354s

Chicago Manual of Style (16^th Edition):

Xing, Xiao. “Layer-by-layer assembly of multilayers on carbon surfaces and molecular electronic junctions.” 2010. Masters Thesis, University of Alberta. Accessed October 20, 2019. https://era.library.ualberta.ca/files/4f16c354s.

MLA Handbook (7^th Edition):

Xing, Xiao. “Layer-by-layer assembly of multilayers on carbon surfaces and molecular electronic junctions.” 2010. Web. 20 Oct 2019.

Vancouver:

Xing X. Layer-by-layer assembly of multilayers on carbon surfaces and molecular electronic junctions. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2019 Oct 20]. Available from: https://era.library.ualberta.ca/files/4f16c354s.

Council of Science Editors:

Xing X. Layer-by-layer assembly of multilayers on carbon surfaces and molecular electronic junctions. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/4f16c354s

Texas A&M University

18. Liao, Kang-Shyang. Polyvalent surface modification of hydrocarbon polymers via covalent layer-by-layer self-assembly.

Degree: 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-3124

► Layer-by-layer (LbL) assembly based on ionic interactions has proven to be a versatile route for surface modification and construction of ultrathin nanocomposites. Covalent LbL assembly… (more)

▼ Layer-by-layer (LbL) assembly based on ionic interactions has proven to be a versatile route for surface modification and construction of ultrathin nanocomposites. Covalent LbL assembly based on facile ?click? covalent bond formation is an effective alternative, especially for the applications where a more robust ultrathin films or nanocomposites is desired. The subject of this dissertation focuses on the design of three different covalent LbL assemblies and their applications on conductive thin films, superhydrophobic surfaces, and solute responsive surfaces, respectively. Surface modification of PE substrates using covalent LbL assembly with PEI and Gantrez is a successful route to prepare a surface graft. The procedure is relative easy, fast and reproducible. Grafting multiple layers of PEI/Gantrez to the PE powder surface provided excellent coverage and promoted stable LbL film growth and excellent adhesion. This carbon black (CB) coated powder was compression molded into films, and their conductivity was measured, which revealed a percolation threshold below 0.01 wt % CB for the PEI-grafted system. Electrical conductivity of 0.2 S/cm was achieved with only 6 wt % CB, which is exceptional for a CB-filled PE film. Direct amination of MWNTs with PEI is a convenient and simple method leading to highly functionalized product that contains 6-8 % by weight PEI. Superhydrophobic PE films can be formed either from ionic LbL self-assembly of MWNT-NH-PEIs and poly(acrylic acid) or from covalent LbL self-assembly of MWNTNH- PEIs and Gantrez when the final graft is acrylated with octadecanoic acid. While the ionically assembled nanocomposite graft is labile under acid, the covalently assembled graft is more chemically robust. Responsive surfaces with significant, reversible, reproducible wettability changes can be prepared by covalent LbL grafting using PNIPAM-c-PNASI and aminated silica nanoparticles. A 65? ?? value was observed with water vs. 1.4 M Na2SO4. The prepared film shows a high surface roughness of ~300 nm, which contributes to the large solute responsive ?? values. The surfaces are reconfigurable in different solute conditions and that the changes in water contact angle are likely due to combination of change in surface roughness along with swell and intercalation of the solute ions into the PNIPAM surface. Advisors/Committee Members: Bergbreiter, David E. (advisor), Batteas, James D. (committee member), Grunlan, Jaime C. (committee member), Simanek, Eric E. (committee member).

Subjects/Keywords: SURFACE MODIFICATION; HYDROCARBON POLYMERS; COVALENT LAYER-BY-LAYER SELF-ASSEMBLY

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APA (6^th Edition):

Liao, K. (2009). Polyvalent surface modification of hydrocarbon polymers via covalent layer-by-layer self-assembly. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3124

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):

Liao, Kang-Shyang. “Polyvalent surface modification of hydrocarbon polymers via covalent layer-by-layer self-assembly.” 2009. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-3124.

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

MLA Handbook (7^th Edition):

Liao, Kang-Shyang. “Polyvalent surface modification of hydrocarbon polymers via covalent layer-by-layer self-assembly.” 2009. Web. 20 Oct 2019.

Vancouver:

Liao K. Polyvalent surface modification of hydrocarbon polymers via covalent layer-by-layer self-assembly. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3124.

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

Council of Science Editors:

Liao K. Polyvalent surface modification of hydrocarbon polymers via covalent layer-by-layer self-assembly. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3124

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

Texas A&M University

19. Dvoracek, Charlene M. Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies.

Degree: 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-517

► Layer-by-layer (LbL) assembly has proven to be a powerful technique for assembling thin films with a variety of properties including electrochromic, molecular sensing, oxygen barrier,… (more)

▼ Layer-by-layer (LbL) assembly has proven to be a powerful technique for assembling thin films with a variety of properties including electrochromic, molecular sensing, oxygen barrier, and antimicrobial. LbL involves the deposition of alternating cationic and anionic ingredients from solution, utilizing the electrostatic charges to develop multilayer films. The present work incorporates cationic antimicrobial agents into the positively-charged layers of LbL assemblies. When these thin films are exposed to a humid environment, the antimicrobial molecules readily diffuse out and prevent bacterial growth. The influence of exposure time, testing temperature, secondary ingredients and number of bilayers on antimicrobial efficacy is evaluated here. Additionally, film growth and microstructure are analyzed to better understand the behavior of these films. The antimicrobial used here is a positively-charged quaternary ammonium molecule (e.g. cetyltrimethylammonium bromide [CTAB]) that allow assemblies to be made with or without an additional polycation like polydiallyldimethylamine. While films without this additional polymer are effective, they do not have the longevity or uniformity of films prepared with its addition. All of the recipes studied show linear growth as a function of the number of bilayers deposited and this growth is relatively thick (i.e. > 100 nm per bilayer). In general, 10-bilayer films prepared with CTAB and poly(acrylic acid) are able to achieve a 2.3 mm zone of inhibition against S. aureus bacteria and 1.3 mm against E. coli when test are conducted at body temperature (i.e. 37 °C). Fewer bilayers reduces efficacy, but lower test temperatures improve zones of inhibition. As long as they are stored in a dry atmosphere, antimicrobial efficacy was found to persist even when films were used four weeks after being prepared. The best films remain effective (i.e. antimicrobially active) for 4-6 days of constant exposure to bacteria-swabbed plates. This technology holds promise for use in transparent wound bandages and temporary surface sterilization. Advisors/Committee Members: Grunlan, Jaime C. (advisor), Benedik, Michael (committee member), Zhang, Xinghang (committee member).

Subjects/Keywords: Layer-by-layer; antimicrobial; cetyltrimethylammonium bromide; film growth; microstructure

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APA (6^th Edition):

Dvoracek, C. M. (2010). Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-517

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):

Dvoracek, Charlene M. “Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies.” 2010. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-517.

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

MLA Handbook (7^th Edition):

Dvoracek, Charlene M. “Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies.” 2010. Web. 20 Oct 2019.

Vancouver:

Dvoracek CM. Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-517.

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

Council of Science Editors:

Dvoracek CM. Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies. [Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-517

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

Texas A&M University

20. Priolo, Morgan Alexander. Layer-by-layer Assembly of Nanobrick Wall Ultrathin Transparent Gas Barrier Films.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11170

► Thin layers with high barrier to oxygen and other gases are a key component to many packaging applications, such as flexible electronics, food, and pharmaceuticals.… (more)

▼ Thin layers with high barrier to oxygen and other gases are a key component to many packaging applications, such as flexible electronics, food, and pharmaceuticals. Vapor deposited thin films provide significant gas barrier, but are prone to cracking when flexed, require special, non-ambient processing environments, and can involve complex fabrication when layered with polymers. The addition of clay into polymers can enhance barrier properties relative to the neat polymer; however, these composites are subject to clay aggregation at high loadings, which leads to increased opacity and random platelet alignment that ultimately reduce barrier improvement. Layer-by-layer (LbL) assembly is capable of producing thin films that exhibit super gas barrier properties, while remaining flexible and completely transparent. Montmorillonite (MMT) clay and branched polyethylenimine (PEI) were deposited via LbL assembly to create gas barrier films that can be tailored by altering the pH of the PEI deposition solution or the concentration of the MMT suspension. Films grow linearly as a function of layers deposited, where increasing PEI pH increases spacing between clay layers and increasing MMT concentration increases thin film clay content. An oxygen transmission rate (OTR) below the detection limit of commercial instrumentation (< 0.005 cm3/m2?day?atm) is observed after 70 layers of 0.2 wt % MMT or 24 layers of 2 wt % MMT are deposited with pH 10 PEI onto 179 ?m thick poly(ethylene terephthalate) (PET) film. Three-component films of PEI, poly(acrylic acid) (PAA), and MMT grow exponentially as a function of PEI/PAA/PEI/MMT quadlayers deposited. A transparent, ultrathin film of only four quadlayers deposited onto PET exhibits the lowest oxygen permeability ever reported for any thin film material, at only 51 nm thick. Finally, the first example of LbL assembly using large aspect ratio vermiculite (VMT) clay was performed. PEI/VMT films grow linearly as a function of layers deposited and exhibit 95 % light transmission with 97 wt % VMT. The barrier of these films is due to the highly aligned nanobrick wall structure that creates a tortuous path for permeating molecules. Coupling high flexibility, transparency, and barrier, these coatings are good candidates for a variety of packaging applications. Advisors/Committee Members: Grunlan, Jaime C. (advisor), Jeong, Hae-Kwon (committee member), Ross, Jr., Joseph H. (committee member), Wang, Haiyan (committee member).

Subjects/Keywords: layer-by-layer assembly; thin films; oxygen barrier; packaging; clays; nanocomposites

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

APA (6^th Edition):

Priolo, M. A. (2012). Layer-by-layer Assembly of Nanobrick Wall Ultrathin Transparent Gas Barrier Films. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11170

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):

Priolo, Morgan Alexander. “Layer-by-layer Assembly of Nanobrick Wall Ultrathin Transparent Gas Barrier Films.” 2012. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11170.

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

MLA Handbook (7^th Edition):

Priolo, Morgan Alexander. “Layer-by-layer Assembly of Nanobrick Wall Ultrathin Transparent Gas Barrier Films.” 2012. Web. 20 Oct 2019.

Vancouver:

Priolo MA. Layer-by-layer Assembly of Nanobrick Wall Ultrathin Transparent Gas Barrier Films. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11170.

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

Council of Science Editors:

Priolo MA. Layer-by-layer Assembly of Nanobrick Wall Ultrathin Transparent Gas Barrier Films. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11170

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

Texas A&M University

21. Yang, You-Hao. Processing and Gas Barrier Behavior of Multilayer Thin Nanocomposite Films.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11685

► Thin films with the ability to impart oxygen and other types of gas barrier are crucial to commercial packaging applications. Commodity polymers, such as polyethylene… (more)

▼ Thin films with the ability to impart oxygen and other types of gas barrier are crucial to commercial packaging applications. Commodity polymers, such as polyethylene (PE), polycarbonate (PC) and polyethylene terephthalate (PET), have insufficient barrier for goods requiring long shelf life. Current gas barrier technologies like plasma-enhanced vapor deposition (PECVD) often create high barrier metal oxide films, which are prone to cracking when flexed. Bulk composites composed of polymer and impermeable nanoparticles show improved barrier, but particle aggregation limits their practical utility for applications requiring high barrier and transparency. Layer-by-layer (LbL) assemblies allow polymers and nanoparticles to be mixed with high particle loadings, creating super gas barrier thin films on substrates normally exhibiting high gas permeability. Branched polyethylenimine (PEI) and poly (acrylic acid) (PAA) were deposited using LbL to create gas barrier films with varying pH combinations. Film thickness and mass fraction of each component was controlled by their combined charge. With lower charge density (PEI at pH 10 and PAA at pH 4), PEI/PAA assemblies exhibit the best oxygen barrier relative to other pH combinations. An 8 BL PEI/PAA film, with a thickness of 451 nm, has an oxygen permeability lower than 4.8 x 10^-21 cm³ * cm/cm² * s * Pa, which is comparable to a 100 nm SiOx nanocoating. Crosslinking these films with glutaraldehyde (GA), 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide methiodide (EDC) or heating forms covalent bonds between PEI and/or PAA. Oxygen transmission rates (OTR) of 8 BL films crosslinked with 0.1M GA or 0.01M EDC show the best oxygen barrier at 100% RH. Graphene oxide (GO) sheets and PEI were deposited via LbL with varying GO concentration. The resulting thin films have an average bilayer thickness from 4.3 to 5.0 nm and a GO mass fraction from 88 to 91wt%. Transmission electron microscopy and atomic force microscopy images reveal a highly-oriented nanobrick wall structure. A 10 BL PEI/GO film that is 91 nm thick, made with a 0.2 wt% GO suspension, exhibits an oxygen permeability of 2.5 x 10^-20 cm³ * cm/cm² * s * Pa. Finally, the influence of deposition time on thin film assembly was examined by depositing montmorillonite (MMT) or laponite (LAP) clays paired with PEI. Film growth and microstructure suggests that smaller aspect ratio LAP clay is more dip-time dependent than MMT and larger aspect ratio MMT has better oxygen barrier. A 30 BL PEI/MMT film made with 10 second dips in PEI has the same undetectable OTR as a film with 5 minute dips (with dips in MMT held at 5 minutes in both cases), indicating LbL gas barrier can be made more quickly than initially thought. These high barrier recipes, with simple and efficient processing conditions, are good candidates for a variety of packaging applications. Advisors/Committee Members: Grunlan, Jaime C. (advisor), Ugaz, Victor (committee member), Jeong, Hae-Kwon (committee member), Batteas, James (committee member).

Subjects/Keywords: Layer-by-layer; gas barrier; moisture barrier; polyelectrolyte; crosslink; graphene oxide

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APA (6^th Edition):

Yang, Y. (2012). Processing and Gas Barrier Behavior of Multilayer Thin Nanocomposite Films. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11685

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):

Yang, You-Hao. “Processing and Gas Barrier Behavior of Multilayer Thin Nanocomposite Films.” 2012. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11685.

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

MLA Handbook (7^th Edition):

Yang, You-Hao. “Processing and Gas Barrier Behavior of Multilayer Thin Nanocomposite Films.” 2012. Web. 20 Oct 2019.

Vancouver:

Yang Y. Processing and Gas Barrier Behavior of Multilayer Thin Nanocomposite Films. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11685.

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

Council of Science Editors:

Yang Y. Processing and Gas Barrier Behavior of Multilayer Thin Nanocomposite Films. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11685

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

Texas A&M University

22. Hu, He 1987-. Layer-by-Layer Assembled Smectite-Polymer Nanocomposite Film for Rapid Detection of Low-Concentration Aflatoxins.

Degree: 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148174

► Aflatoxin is a potent biological toxin produced by fungi Aspergillus flavus and A. parasiticus. Current quantification methods for aflatoxins are mostly established on immunoaffinity columns… (more)

▼ Aflatoxin is a potent biological toxin produced by fungi Aspergillus flavus and A. parasiticus. Current quantification methods for aflatoxins are mostly established on immunoaffinity columns which are both costly and labor intensive. Inspired by smectites? high aflatoxin adsorption capacity and affinity, a novel aflatoxin quantification sensor based on smectite-polyacrylamide (PAM) nanocomposite was fabricated. First, a smectite-PAM nanocomposite film was synthesized on flat silicon substrates which assembled smectite particles from the clay suspension. A layer-by-layer assembly process was developed to achieve uniform morphology and thickness of the nanocomposite films. During the aflatoxin quantification process, positive correlations between the fluorescence intensity from the aflatoxin B1 (AFB1) adsorbed smectite-PAM nanocomposite films and the AFB1 concentration in the test solutions were obtained. The smectite-PAM nanocomposite film has shown similar AFB1 adsorption capabilities as the smectite. Second, the smectite-PAM nanocomposite film was optimized in order to achieve the aflatoxin quantification at ppb level (below 20ppb) in corn extraction solutions. The smectite was modified by Ba2+, which had demonstrated to be able to improve its aflatoxin adsorption capacity. PAM aqueous solutions with the mass concentration ranging from 0.8% to 0.001% were tested. The results showed that the nanocomposite synthesized from 0.005% concentration of PAM solution generated the best properties. After the optimization, the smectite-PAM nanocomposite films achieved the detection of aflatoxin B1, B2, G1 and G2 (AFB2, AFG1 and AFG2) in 10 ppb corn extraction solution. Aflatoxin quantifications in AFB1 and AFB2 mixture solution, AFB1 and AFB2 mixture solution and AFB1 and AFG1 mixture solution were conducted, and the recoveries of last test ranged from 90.52% to 110.11% at low aflatoxin concentration (below 20 ppb). Third, in order to shorten the quantification duration and simplify the detection process, a novel aflatoxin detection array based on smectite-PAM nanocomposite and an improved fluorometric quantification method were developed. Through a microfluidic chip, the reaction time was reduced to 10~20min. Two concentration levels (20~80ppb/5~15ppb) of aflatoxin B1 spiked corn extraction solutions were tested. In the fluorometric quantification step, a common lab-use 365 nm ultraviolet lamp replaced the spectrofluorometer which simplified and accelerated the process. Advisors/Committee Members: Zou, Jun (advisor), Deng, Youjun (committee member), Ji, Jim Xiuquan (committee member), Kameoka, Jun (committee member).

Subjects/Keywords: PDMS.; microfluidics; spectrofluorometer; layer by layer assembly; smectite; aflatoxin

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

APA (6^th Edition):

Hu, H. 1. (2012). Layer-by-Layer Assembled Smectite-Polymer Nanocomposite Film for Rapid Detection of Low-Concentration Aflatoxins. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148174

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):

Hu, He 1987-. “Layer-by-Layer Assembled Smectite-Polymer Nanocomposite Film for Rapid Detection of Low-Concentration Aflatoxins.” 2012. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/148174.

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

MLA Handbook (7^th Edition):

Hu, He 1987-. “Layer-by-Layer Assembled Smectite-Polymer Nanocomposite Film for Rapid Detection of Low-Concentration Aflatoxins.” 2012. Web. 20 Oct 2019.

Vancouver:

Hu H1. Layer-by-Layer Assembled Smectite-Polymer Nanocomposite Film for Rapid Detection of Low-Concentration Aflatoxins. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/148174.

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

Council of Science Editors:

Hu H1. Layer-by-Layer Assembled Smectite-Polymer Nanocomposite Film for Rapid Detection of Low-Concentration Aflatoxins. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148174

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

Université Catholique de Louvain

23. Vercauteren, Roselien. Functional soft nanotubes for drug delivery applications.

Degree: 2017, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/thesis:10633

►

This work aimed to build polyelectrolyte nanotubes bearing in mind future drug delivery applications. Such structures are obtained by combining Layer-by-Layer assembly, a material deposition… (more)

▼

This work aimed to build polyelectrolyte nanotubes bearing in mind future drug delivery applications. Such structures are obtained by combining Layer-by-Layer assembly, a material deposition technique, with template synthesis, using a nanoporous polycarbonate membrane as template. Two different systems were studied: one comprised of synthetic polyelectrolytes, namely poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS), and one comprised of semi-natural polyelectrolytes, namely chitosan (CHI) and hyaluronan (HA). These two systems were chosen for the purpose of building core-shell structures. In the present work, the effect of several assembling conditions was studied for both systems in order to gain a better understanding of their respective properties. Firstly, PAH/PSS multilayers were built with varying ionic strength and pH. Even the lowest salt concentration chosen for the PE solutions resulted in thicker layers compared to zero ionic strength. However, a negligible influence was found for small concentration increases. For pH, only a small variation was investigated and it was found to cause no effect on the thickness or on the morphology of the nanotubes. The stability of the nanotubes after a prolonged contact with water was also explored. It was noted that, although there is a slight loss in rigidity at first, the PAH/PSS nanotubes remain stable when stored in water for longer periods of time. The same investigations were then performed on CHI/HA multilayers. Ionic strength was observed to cause opposing effects for flat and nanoporous substrates. It led to thicker layers for nanotubes, but the effect was more complex for flat films: for low ionic strength there was an increase in layer thickness, yet for higher values, there was a loss of thickness, suggesting that the critical salt concentration was reached. Variations in the assembling pH are in line with the ionisation curves found in the literature, creating thinner layers at pH 5 and thicker ones at pH 4 and 6. In terms of stability in water, CHI/HA nanotubes were found to lose a great deal of rigidity upon contact with water, even more for tubes assembled at pH 6. For prolonged storage in aqueous solution, further losses of rigidity and changes in morphology were observed only in the first 24 hours. Finally, the cross-linking of the multilayers was investigated in order to increase the nanotubes rigidity in water, but no effect was noticed for the chosen concentrations of EDC and sulfo-NHS. Although some assembling parameters require further explorations before entirely understanding the studied systems properties, this work still paves the way for further investigations involving core-shell nanotubes comprised of the two systems described above.

Master [120] : ingénieur civil en chimie et science des matériaux, Université catholique de Louvain, 2017

Advisors/Committee Members: UCL - Ecole polytechnique de Louvain, Demoustier-Champagne, Sophie, Jonas, Alain.

Subjects/Keywords: Chitosan; Hyaluronan; PAH; PSS; pH; Ionic strength; Layer-by-layer; Nanotubes

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

APA (6^th Edition):

Vercauteren, R. (2017). Functional soft nanotubes for drug delivery applications. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/thesis:10633

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):

Vercauteren, Roselien. “Functional soft nanotubes for drug delivery applications.” 2017. Thesis, Université Catholique de Louvain. Accessed October 20, 2019. http://hdl.handle.net/2078.1/thesis:10633.

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

MLA Handbook (7^th Edition):

Vercauteren, Roselien. “Functional soft nanotubes for drug delivery applications.” 2017. Web. 20 Oct 2019.

Vancouver:

Vercauteren R. Functional soft nanotubes for drug delivery applications. [Internet] [Thesis]. Université Catholique de Louvain; 2017. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/2078.1/thesis:10633.

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

Council of Science Editors:

Vercauteren R. Functional soft nanotubes for drug delivery applications. [Thesis]. Université Catholique de Louvain; 2017. Available from: http://hdl.handle.net/2078.1/thesis:10633

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

Virginia Tech

24. Pillai, Karthik. Bio-inspired Cellulose Nanocomposites.

Degree: PhD, Macromolecular Science and Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/28575

► Natural composites like wood are scale-integrated structures that range from molecular to the macroscopic scale. Inspired by this design, layer-by-layer (LbL) deposition technique was used… (more)

▼ Natural composites like wood are scale-integrated structures that range from molecular to the macroscopic scale. Inspired by this design, layer-by-layer (LbL) deposition technique was used to create lignocellulosic composites from isolated wood polymers namely cellulose and lignin, with a lamellar architecture. In the first phase of the study, adsorption of alkali lignin onto cationic surfaces was investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D). Complete coverage of the cationic surface with alkali lignin occured at low solution concentration; large affinity coefficients were calculated for this system at differing pH levels. Adsorption studies with organosolv lignin in an organic solvent, and spectroscopic analysis of mixtures of cationic polymer with alkali lignin revealed a non-covalent interaction. The work demonstrated how noncovalent interactions could be exploited to molecular organize thin polyphenolic biopolymers on cationic surfaces. The second phase of the study examined the adsorption steps during the LbL assembly process to create novel lignocellulosic composites. LbL assembly was carried out using oxidized nanocellulose (NC) and lignin, along with a cationic polymer poly(diallyldimethylammonium chloride) (PDDA). QCM-D was used to follow the sequential adsorption process of the three different polymers. Two viscoelastic models, namely Johannsmann and Voigt, were respectively used to calculate the areal mass and thickness of the adsorbed layers. Atomic force microscopy studies showed a complete coverage of the surface with lignin in all the disposition cycles, however, surface coverage with NC was seen to increase with the number of layers. Free-standing composite films were obtained when the LbL process was carried out for 250 deposition cycles (500 bilayers) on a cellulose acetate substrate, following the dissolution of the substrate in acetone. Scanning electron microscopy of the cryo-fractured cross-sections showed a lamellar structure, and the thickness per adsorption cycle was estimated to be 17 nm. The third phase of the study investigated the effect of LbL ordering of the polymers versus a cast film composed of a blended mixture of the polymers, using dynamic mechanical analysis. A tan ï ¤ peak was observed in the 30 â 40 ÂºC region for both films, which was observed in the neat NC film. Heating of the samples under a compressive force produced opposite effects in the films, as the LbL films exhibited swelling, whereas the cast films showed densification. The apparent activation energy of this transition (65 â 80 kJ mol-1) in cast films, calculated based on the Arrhenius equation was found to be coincident to those reported for the ï ¢ transition of amorphous cellulose. The peak was seen to disappear in case of LbL films in the second heat, whereas it was recurring in case of cast films of the blended mixture, and neat NC films. Altogether, the together the work details a novel path to integrate an organized lignin and cellulose molecular structure,… Advisors/Committee Members: Renneckar, Scott Harold (committeechair), Roman, Maren (committee member), Esker, Alan R. (committee member), Frazier, Charles E. (committee member), Edgar, Kevin J. (committee member).

Subjects/Keywords: Nanocellulose; Nanocomposite; Biomimetic; Layer-by-layer (LbL); QCM-D; AFM

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APA (6^th Edition):

Pillai, K. (2011). Bio-inspired Cellulose Nanocomposites. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28575

Chicago Manual of Style (16^th Edition):

Pillai, Karthik. “Bio-inspired Cellulose Nanocomposites.” 2011. Doctoral Dissertation, Virginia Tech. Accessed October 20, 2019. http://hdl.handle.net/10919/28575.

MLA Handbook (7^th Edition):

Pillai, Karthik. “Bio-inspired Cellulose Nanocomposites.” 2011. Web. 20 Oct 2019.

Vancouver:

Pillai K. Bio-inspired Cellulose Nanocomposites. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/10919/28575.

Council of Science Editors:

Pillai K. Bio-inspired Cellulose Nanocomposites. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/28575

Texas A&M University

25. Guin, Tyler C. Improving Layer-by-Layer Assembly for Superior Flame Retardant and Gas Barrier Thin Films.

Degree: 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/156424

► Layer-by-layer (LbL) assembly is a promising technique for depositing multi-functional thin films from dilute aqueous solutions. These films have found use as environmentally-benign flame retardants,… (more)

Subjects/Keywords: Layer-by-layer assembly; multilayer; flame retardant; chitosan

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APA (6^th Edition):

Guin, T. C. (2015). Improving Layer-by-Layer Assembly for Superior Flame Retardant and Gas Barrier Thin Films. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156424

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):

Guin, Tyler C. “Improving Layer-by-Layer Assembly for Superior Flame Retardant and Gas Barrier Thin Films.” 2015. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/156424.

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

MLA Handbook (7^th Edition):

Guin, Tyler C. “Improving Layer-by-Layer Assembly for Superior Flame Retardant and Gas Barrier Thin Films.” 2015. Web. 20 Oct 2019.

Vancouver:

Guin TC. Improving Layer-by-Layer Assembly for Superior Flame Retardant and Gas Barrier Thin Films. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/156424.

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

Council of Science Editors:

Guin TC. Improving Layer-by-Layer Assembly for Superior Flame Retardant and Gas Barrier Thin Films. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156424

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

Cornell University

26. Trejo, Nidia. Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods .

Degree: 2015, Cornell University

URL: http://hdl.handle.net/1813/39394

► In this study carboxylic acid coated magnetite nanoparticles (CA-Fe3O4 NPs) were applied to mechanically robust, Nylon 6 nanomembranes by three different techniques; 1) simultaneous electrospraying-electrospinning,… (more)

Subjects/Keywords: Electrospraying; Layer-by-Layer assembly; EDC/NHS chemical grafting

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APA (6^th Edition):

Trejo, N. (2015). Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/39394

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):

Trejo, Nidia. “Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods .” 2015. Thesis, Cornell University. Accessed October 20, 2019. http://hdl.handle.net/1813/39394.

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

MLA Handbook (7^th Edition):

Trejo, Nidia. “Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods .” 2015. Web. 20 Oct 2019.

Vancouver:

Trejo N. Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods . [Internet] [Thesis]. Cornell University; 2015. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1813/39394.

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

Council of Science Editors:

Trejo N. Loading Polymer Coated Magnetite Nanoparticles On Nylon 6 Nanomembranes By Three Methods . [Thesis]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/39394

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

University of Melbourne

27. Yong, Joel Kah Jin. The development of thin films for efficient carbon capture and storage.

Degree: 2016, University of Melbourne

URL: http://hdl.handle.net/11343/121910

► The chemical absorption of carbon dioxide (CO2) into a monoethanolamine (MEA) solvent is the accepted commercial process for industrial CO2 capture operations. Gas-liquid absorption processes… (more)

▼ The chemical absorption of carbon dioxide (CO2) into a monoethanolamine (MEA) solvent is the accepted commercial process for industrial CO2 capture operations. Gas-liquid absorption processes are conducted mainly in absorption towers or membrane contactors, with absorption columns being the preferred industrial method of choice. However, the subsequent desorption of CO2 from the typical MEA solvent is extremely energy intensive. Alternative solvents, such as potassium carbonate (K2CO3), are more energy efficient and relatively inert in comparison to the alkanolamines, but their slow reaction kinetics in the absorption process limits their application in absorption processes. A membrane contactor is preferable to a packed column for absorption because of its large surface-to-volume ratio and its ease in scaling up. The membrane gas absorption (MGA) of CO2 makes use of a porous hydrophobic membrane material as a barrier between a CO2 gas stream and an aqueous solvent stream to absorb the gaseous CO2 into the liquid solvent. The CO2 diffuses across the membrane and dissolves into the solvent, where it can subsequently be stripped from the solvent for solvent reuse and storage of the CO2. However, most membrane materials are easily wetted by the alkanolamine solvents, resulting in reduced mass transfer rates. Hence, membrane contactor operations are more preferably run with solvents that are not as likely to cause mass transfer issues associated with wetting as the alkanolamines do. The use of a carbonic anhydrase (CA) enzyme as a reaction promoter may overcome the reduced overall absorption rates exhibited by K2CO3 relative to MEA. However, these enzymes tend to denature at higher temperatures and would not be suited for use in circulation within a traditional absorber-stripper process. The immobilization of the enzyme within the gas absorber or onto a membrane contactor can increase enzyme stability and avoid thermal denaturation in the stripper. However, immobilization is only effective if the mass transfer of CO2 through the liquid phase to reach the immobilization substrate does not become rate controlling. The enzyme-aided mass transfer of CO2 is at its most effective when the enzyme is immobilized at the gas-liquid interface, and the use of porous microparticles containing adsorbed CA in an absorption column has not yielded much results either. The immobilization of CA onto a membrane contactor brings it closer to the gas-liquid interface and has yielded more substantial increases in the mass transfer kinetics. Multiple methods for immobilizing CA onto the surface of a membrane contactor have been proposed, though the layer-by-layer (LbL) technique for enzyme immobilization has not been investigated for enhancing CO2 absorption operations thus far. LbL assembly has been used effectively on a wide range of polyelectrolytes and proteins for the fabrication of uniform thin films on different planar surfaces. It is possible to immobilize CA in thin films on a polymeric membrane surface for enhancing CO2 mass…

Subjects/Keywords: membrane contactor; layer-by-layer; carbon dioxide capture; mass transfer

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

APA (6^th Edition):

Yong, J. K. J. (2016). The development of thin films for efficient carbon capture and storage. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/121910

Chicago Manual of Style (16^th Edition):

Yong, Joel Kah Jin. “The development of thin films for efficient carbon capture and storage.” 2016. Doctoral Dissertation, University of Melbourne. Accessed October 20, 2019. http://hdl.handle.net/11343/121910.

MLA Handbook (7^th Edition):

Yong, Joel Kah Jin. “The development of thin films for efficient carbon capture and storage.” 2016. Web. 20 Oct 2019.

Vancouver:

Yong JKJ. The development of thin films for efficient carbon capture and storage. [Internet] [Doctoral dissertation]. University of Melbourne; 2016. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/11343/121910.

Council of Science Editors:

Yong JKJ. The development of thin films for efficient carbon capture and storage. [Doctoral Dissertation]. University of Melbourne; 2016. Available from: http://hdl.handle.net/11343/121910

Texas A&M University

28. Holder, Kevin Michael. Flame Retardant Nanocoatings for the Protection of Polyurethane Foam.

Degree: PhD, Materials Science and Engineering, 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/174265

► Layer-by-layer (LbL) assembly is a simple technique capable of building multifunctional thin films on a variety of surfaces from dilute aqueous solutions. LbL coatings on… (more)

▼ Layer-by-layer (LbL) assembly is a simple technique capable of building multifunctional thin films on a variety of surfaces from dilute aqueous solutions. LbL coatings on polyurethane foam have been successful in reducing the flammability through environmentally friendly means. This technology provides a potential avenue for replacing halogenated flame retardants which are successfully used on foams, but present a toxic threat to health and the environment. A thin film nano-brick wall structure composed of chitosan and vermiculite clay was combined with an all-polymer film of chitosan and ammonium polyphosphate to form a stacked coating on polyurethane foam to reduce flammability. Individually, the coatings were able to reduce flammability of the foam, however the all-polymer coating was unable to prevent total degradation of the polyurethane due to inability to form char prior to the collapse of the foam. The nano-brick wall provided the necessary structure to allow the all-polymer coating to act and form an expanded insulating char layer that prevents flame spread across the surface of the polyurethane as well as reduce the peak heat release rate of the foam significantly. Incorporating carbon nanotubes into a LbL assembly allowed further reductions in polyurethane foam flammability. Only a few layers of nanotube-containing polymer layers were able to completely prevent flame propagation in both horizontal and vertical flame tests. Cone calorimetry revealed significant reductions in peak heat release rate as well as total smoke release. Reduction in heat release rates and smoke release are important factors towards extending escape time in a fire scenario. Barrier fabrics are commonly used to protect flammable materials. A polyelectrolyte complex was used to coat cotton fabric and prevented flame spread and ignition of underlying polyurethane foam. This study also highlights the importance of testing combined fabric and foam assemblies as pertaining to upholstered furniture. Cone calorimetry is a useful instrument to ascertain interactions between varying fabric and foam compositions and potentially will highlight an appropriate method for flame retarding the combination. Advisors/Committee Members: Grunlan, Jaime (advisor), Clearfield, Abraham (committee member), Creasy, Terry (committee member), Green, Micah (committee member).

Subjects/Keywords: layer-by-layer; multilayer; flame retardant; polyurethane; nanocoating

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APA (6^th Edition):

Holder, K. M. (2016). Flame Retardant Nanocoatings for the Protection of Polyurethane Foam. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174265

Chicago Manual of Style (16^th Edition):

Holder, Kevin Michael. “Flame Retardant Nanocoatings for the Protection of Polyurethane Foam.” 2016. Doctoral Dissertation, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/174265.

MLA Handbook (7^th Edition):

Holder, Kevin Michael. “Flame Retardant Nanocoatings for the Protection of Polyurethane Foam.” 2016. Web. 20 Oct 2019.

Vancouver:

Holder KM. Flame Retardant Nanocoatings for the Protection of Polyurethane Foam. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/174265.

Council of Science Editors:

Holder KM. Flame Retardant Nanocoatings for the Protection of Polyurethane Foam. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/174265

University of Akron

29. Zhong, Yingfan. LAYER-BY-LAYER ROSE PETAL MIMIC SURFACE FOR OIL/WATER SEPARATIONS.

Degree: MSin Polymer Engineering, Polymer Engineering, 2016, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1468441832

► Some flower petal surfaces, such as rose petals, are known to be hydrophobic surfaces with a high static contact angle as well as high adhesion… (more)

Subjects/Keywords: Polymers; layer-by-layer, rose petal, hydrophobic, oleophilic, oil water separation

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APA (6^th Edition):

Zhong, Y. (2016). LAYER-BY-LAYER ROSE PETAL MIMIC SURFACE FOR OIL/WATER SEPARATIONS. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1468441832

Chicago Manual of Style (16^th Edition):

Zhong, Yingfan. “LAYER-BY-LAYER ROSE PETAL MIMIC SURFACE FOR OIL/WATER SEPARATIONS.” 2016. Masters Thesis, University of Akron. Accessed October 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1468441832.

MLA Handbook (7^th Edition):

Zhong, Yingfan. “LAYER-BY-LAYER ROSE PETAL MIMIC SURFACE FOR OIL/WATER SEPARATIONS.” 2016. Web. 20 Oct 2019.

Vancouver:

Zhong Y. LAYER-BY-LAYER ROSE PETAL MIMIC SURFACE FOR OIL/WATER SEPARATIONS. [Internet] [Masters thesis]. University of Akron; 2016. [cited 2019 Oct 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1468441832.

Council of Science Editors:

Zhong Y. LAYER-BY-LAYER ROSE PETAL MIMIC SURFACE FOR OIL/WATER SEPARATIONS. [Masters Thesis]. University of Akron; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1468441832

Université Catholique de Louvain

30. Ramirez Wong, Diana Guadalupe. Brushes of self-assembled nanotubes for temperature-responsive biocatalysis.

Degree: 2014, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/151206

►

Inspired by the elegant solutions that Nature has provided to control and promote specific site-reactions, my work presents an attempt to mimic filamentous biocatalytic interfaces.… (more)

Subjects/Keywords: PNIPAM; Layer-by-layer; Nanostructures; Enzyme; Membrane-templating

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APA (6^th Edition):

Ramirez Wong, D. G. (2014). Brushes of self-assembled nanotubes for temperature-responsive biocatalysis. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/151206

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):

Ramirez Wong, Diana Guadalupe. “Brushes of self-assembled nanotubes for temperature-responsive biocatalysis.” 2014. Thesis, Université Catholique de Louvain. Accessed October 20, 2019. http://hdl.handle.net/2078.1/151206.

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

MLA Handbook (7^th Edition):

Ramirez Wong, Diana Guadalupe. “Brushes of self-assembled nanotubes for temperature-responsive biocatalysis.” 2014. Web. 20 Oct 2019.

Vancouver:

Ramirez Wong DG. Brushes of self-assembled nanotubes for temperature-responsive biocatalysis. [Internet] [Thesis]. Université Catholique de Louvain; 2014. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/2078.1/151206.

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

Council of Science Editors:

Ramirez Wong DG. Brushes of self-assembled nanotubes for temperature-responsive biocatalysis. [Thesis]. Université Catholique de Louvain; 2014. Available from: http://hdl.handle.net/2078.1/151206

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

Open Access Theses and Dissertations