subject:(Bio Compatible Polymers Electrospinning Impregnation Release Diffusion High Pressure CO2)

The Ohio State University

1. Munj, Hrishikesh. CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS.

Degree: PhD, Chemical and Biomolecular Engineering, 2014, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315

► Current biomedical applications are focused towards solving more challenging problems with sustainable and economic solutions. Drug delivery systems, tissue engineered scaffolds and diagnostic devices are… (more)

▼ Current biomedical applications are focused towards solving more challenging problems with sustainable and economic solutions. Drug delivery systems, tissue engineered scaffolds and diagnostic devices are major areas of biomedical systems which require more efficient and benign fabrication and processing. Design of above mentioned systems involves three key components; biomaterial selection, structure and nutrient supply. Various factors such as, biocompatibility, degradation, toxicity, mechanical properties, need to be considered before biomaterial selection for specific application. Polymers are most widely used for biomedical applications due to their ability to tailor properties for specific requirements. Structured patterns are mandatory in most of the biomedical systems such as core-shell structure for drug delivery, porous scaffolds for tissue engineering and microchannels for microfluidics based devices. In the end, these systems demand efficient incorporation of sensitive drug and biomolecules and controlled release. Thus, designing of biomedical systems become a complex process where structure needs to be maintained for a biomaterial throughout the design process. High pressure carbon dioxide (CO2) offers a `green’s benign and inexpensive way for fabrication and impregnation of additives in the biocompatible polymers. CO2 assisted plasticization of polymers enhances diffusion of additives in the polymer matrix. However, interactions among polymer, CO2 and additives are complex and difficult to understand. Density and diffusivity of CO2 can be controlled easily by adjusting temperature and pressure. Hence extent of plasticization of polymer can be controlled. In the present study, biocompatible polymer blends were investigated from biomedical applications perspective. Electrospinning is a versatile process to prepare fibrous scaffolds. This process was applied to different binary and ternary blends to fabricate electrospun scaffolds. There scaffolds were impregnated with additives using high pressure CO2 to study release profiles. Results show electrospun polymer blends interact differently with each process step adopted in this study. Effect of dominant impregnation and release parameters were investigated to control and predict release of additives from complex electrospun scaffolds. The work presented in this dissertation aids in understanding of additive release from electrospun polymer blends with complex behavior. Advisors/Committee Members: Tomasko, David (Advisor).

Subjects/Keywords: Chemical Engineering; Polymers; Biomedical Engineering; Bio-Compatible Polymers, Electrospinning, Impregnation, Release, Diffusion, High Pressure CO2

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APA (6^th Edition):

Munj, H. (2014). CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315

Chicago Manual of Style (16^th Edition):

Munj, Hrishikesh. “CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS.” 2014. Doctoral Dissertation, The Ohio State University. Accessed February 28, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315.

MLA Handbook (7^th Edition):

Munj, Hrishikesh. “CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS.” 2014. Web. 28 Feb 2021.

Vancouver:

Munj H. CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS. [Internet] [Doctoral dissertation]. The Ohio State University; 2014. [cited 2021 Feb 28]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315.

Council of Science Editors:

Munj H. CO2 ASSISTED PROCESSING OF BIOCOMPATIBLE ELECTROSPUN POLYMER BLENDS. [Doctoral Dissertation]. The Ohio State University; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1400693315

2. Patel, Keyur V. Studies in design and characterization of controlled release antihypertensive drug formulations prepared using bio compatible polymers; -.

Degree: Pharmacology, 1997, Gujarat University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/35805

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Advisors/Committee Members: Gohel, M C.

Subjects/Keywords: compatible polymers; controlled release; drug formulations

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APA (6^th Edition):

Patel, K. V. (1997). Studies in design and characterization of controlled release antihypertensive drug formulations prepared using bio compatible polymers; -. (Thesis). Gujarat University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/35805

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):

Patel, Keyur V. “Studies in design and characterization of controlled release antihypertensive drug formulations prepared using bio compatible polymers; -.” 1997. Thesis, Gujarat University. Accessed February 28, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/35805.

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

MLA Handbook (7^th Edition):

Patel, Keyur V. “Studies in design and characterization of controlled release antihypertensive drug formulations prepared using bio compatible polymers; -.” 1997. Web. 28 Feb 2021.

Vancouver:

Patel KV. Studies in design and characterization of controlled release antihypertensive drug formulations prepared using bio compatible polymers; -. [Internet] [Thesis]. Gujarat University; 1997. [cited 2021 Feb 28]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/35805.

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

Council of Science Editors:

Patel KV. Studies in design and characterization of controlled release antihypertensive drug formulations prepared using bio compatible polymers; -. [Thesis]. Gujarat University; 1997. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/35805

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

University of Illinois – Chicago

3. Wu, Qianyi. CO2 Sequestration via Olivine Dissolution and Carbonation by Using (HPEC) and (HPIC).

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19473

► CO2 storage by mineral carbonation is one option to limit the rise of anthropogenic CO2 concentration in the atmosphere and to minimize climate change, which… (more)

▼ CO2 storage by mineral carbonation is one option to limit the rise of anthropogenic CO2 concentration in the atmosphere and to minimize climate change, which is the most significant environmental challenge in the world today. Olivine is one of the most investigated mineral resources for carbonization. In this study, independent variables were investigated, including effects of temperature, pressure, additives and particle size. The effects of these parameters are compared to the literature by using a High Pressure Environmental Chamber (HPEC) and a High Pressure Incubation Chamber (HPIC): i) This study was consistent with previous studies showing that smaller particles produce more rapid reactions. ii) Additives 2.5 M NaHCO3 and 1M NaCl + 0.64 M NaHCO3 accelerated the reaction. The 2.5 M NaHCO3 additive increased the reaction rate of dissolution of olivine more than other additives, both early in the reaction and for the overall reaction. Without additives, olivine dissolution rate is relatively slow and leads to small amounts of precipitated magnesite. iii) Temperature showed an increase in reaction rate and was consistent with the study by Mckelvy et al (2006). iv) Pressure did not show any obvious effect. This result does not agree with the study of Mckelvy et al (2006). This result shows that increasing the pressure of CO2 only produces small amounts of CO3 2- for olivine carbonization. Nesquehonite was precipitated from the reaction of CO2 with olivine without any pre-treatment in the HPEC. This approach for sequestration is relatively safe and simple, and provides a potential method of CO2 sequestration by trapping CO2 and forming a stable mineral at ambient conditions. Due to the slow reaction rate, the HPEC is not optimized to study olivine carbonation. With the improvement of the design of the valve on HPIC, this vessel is more suitable to study the olivine reaction. Advisors/Committee Members: Guggenheim, Stephen J. (advisor), Koster van Groos, August (committee member), Meyer-Dombard, D'Arcy (committee member).

Subjects/Keywords: CO2 Sequenstration; Olivine; High Pressure Environmental Chamber; High Pressure Incubation Chamber

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APA (6^th Edition):

Wu, Q. (2015). CO2 Sequestration via Olivine Dissolution and Carbonation by Using (HPEC) and (HPIC). (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19473

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):

Wu, Qianyi. “CO2 Sequestration via Olivine Dissolution and Carbonation by Using (HPEC) and (HPIC).” 2015. Thesis, University of Illinois – Chicago. Accessed February 28, 2021. http://hdl.handle.net/10027/19473.

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

MLA Handbook (7^th Edition):

Wu, Qianyi. “CO2 Sequestration via Olivine Dissolution and Carbonation by Using (HPEC) and (HPIC).” 2015. Web. 28 Feb 2021.

Vancouver:

Wu Q. CO2 Sequestration via Olivine Dissolution and Carbonation by Using (HPEC) and (HPIC). [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10027/19473.

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

Council of Science Editors:

Wu Q. CO2 Sequestration via Olivine Dissolution and Carbonation by Using (HPEC) and (HPIC). [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19473

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

University of Wollongong

4. Esrafilzadeh, Dorna. Fabrication and characterisation of conducting fibres for use in biomedical applications.

Degree: PhD, 2013, University of Wollongong

URL: ; https://ro.uow.edu.au/theses/4111

► Fabrication and characterisation of conducting biomaterials in 3-dimensional configuration for biomedical applications have been studied and is presented in this thesis. Different fibre spinning… (more)

▼ Fabrication and characterisation of conducting biomaterials in 3-dimensional configuration for biomedical applications have been studied and is presented in this thesis. Different fibre spinning techniques (wet-spinning and electrospinning) were utilised to create multifunctional fibres to be employed for controlled drug delivery and cellular growth supports. Two different classes of organic conductors, namely conducting polymers and graphene, were utilised to induce and develop electrical and electrochemical features in the fibres for their potential applications in drug delivery and cell growth enhancement via electrical stimulation. Physical, mechanical, electrical, electrochemical and biological characterisations of the fibres were investigated. In chapter two, Poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT:PSS) and polypyrrole (Ppy) were utilised in conjugation with chitosan for fabrication of conducting biocompatible fibres using wet-spinning. Then, a layer of Ppy with an antibiotic drug Ciprofloxacin hydrochloride (Cipro) as a dopant for Ppy was produced on the PEDOT:PSS-CHI fibres. The wet-spinning of PEDOT:PSS in a chitosan coagulation bath was successfully carried out and the fibres were shown to have an electrical conductivity of 56 ± 7 S/cm with a modulus and strength of 2.0 ± 0.3 GPa and 99 ± 7 MPa, respectively. The PEDOT:PSS-CHI fibres were subsequently employed as an electrode for the electropolymerisation of Ppy.Cipro on their surfaces. Scanning electron microscopy (SEM) of the fibres showed the morphological differences between PEDOT:PSS and Ppy.Cipro layers, confirming the deposition of the Ppy.Cipro. Cyclic voltammograms of fibres exhibited that the Ppy.Cipro was electroactive and showed an oxidation and reduction peak at +0.2 V and -0.1 V, respectively. The conducting and electroactive fibres were utilised for controlling the release of Cipro using an electrochemical stimulation protocol. The results of electrical stimulation of fibres revealed that Cipro release could be tuned by utilizing the different redox states of PEDOT:PSS-CHI and Ppy.Cipro conducting polymers. The in vitro antibacterial studies on the fibres and released Cipro demonstrated that the drug did not lose its antibacterial property during electropolymerisation and electrochemically stimulated release processes. In vitro fluorescent staining images revealed that the fibres were not cytotoxic to B35 neuroblastoma cells, however, the cells tended to cluster together rather than attach to the fibres. Moreover, the results of a lactate dehydrogenase (LDH) test revealed that the Cipro concentrations released in this study did not have an adverse effect on B35 neural cell. In chapter three, the development of a novel and facile system of wet-electrospinning (combined electrospinning and wet-spinning) is presented. This new method was developed in order to improve the attachment behaviour of B35 neuroblastoma cells on wet-spun fibres containing conducting polymers. The process of fibre…

Subjects/Keywords: IPRI; organic conductors; wet spinning; electrospinning; conducting polymers; controlled drug release; graphene; tissue engineering; cells

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

APA (6^th Edition):

Esrafilzadeh, D. (2013). Fabrication and characterisation of conducting fibres for use in biomedical applications. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/4111

Chicago Manual of Style (16^th Edition):

Esrafilzadeh, Dorna. “Fabrication and characterisation of conducting fibres for use in biomedical applications.” 2013. Doctoral Dissertation, University of Wollongong. Accessed February 28, 2021. ; https://ro.uow.edu.au/theses/4111.

MLA Handbook (7^th Edition):

Esrafilzadeh, Dorna. “Fabrication and characterisation of conducting fibres for use in biomedical applications.” 2013. Web. 28 Feb 2021.

Vancouver:

Esrafilzadeh D. Fabrication and characterisation of conducting fibres for use in biomedical applications. [Internet] [Doctoral dissertation]. University of Wollongong; 2013. [cited 2021 Feb 28]. Available from: ; https://ro.uow.edu.au/theses/4111.

Council of Science Editors:

Esrafilzadeh D. Fabrication and characterisation of conducting fibres for use in biomedical applications. [Doctoral Dissertation]. University of Wollongong; 2013. Available from: ; https://ro.uow.edu.au/theses/4111

University of Iowa

5. Gandhi, Swapnilkumar J. Barrier-mediated pulsatile release.

Degree: PhD, Chemical and Biochemical Engineering, 2015, University of Iowa

URL: https://ir.uiowa.edu/etd/1601

► Solutes are often most efficiently deployed in discrete pulses, for example in the delivery of herbicides or drugs. Manual application of each pulse can… (more)

▼ Solutes are often most efficiently deployed in discrete pulses, for example in the delivery of herbicides or drugs. Manual application of each pulse can be labor-intensive, automated application of each pulse can be capital intensive, and both are often costly and impractical. Barrier-Mediated Pulsatile Release (BMPR) systems offer a materials-based alternative for automated pulsatile drug delivery, without pumps, power supplies, or complex circuitry. While earlier materials-based approaches such as delayed-release microcapsules are limited to two or three pulses due to the independent nature of each pulse’s timing control, BMPR systems link the timing of each pulse to the previous pulse. Each dose of drug is sequestered in its own stimuli-sensitive depot, releasing only upon contact with the stimulant. These depots are stacked with sacrificial barriers in between, each of which block the stimulant for a predetermined time. For instance, layers of soluble drug may be separated by degradable polymer layers. Water, as the stimulant, will erode the polymer layer over a fixed period of time, followed by quick dissolution and release of the underlying drug and the start of degradation for the next polymer layer. This example, however, is quickly limited by irregular polymer erosion, a single stimulant (water), and difficulty in scaling delay times. The research work presented in this thesis reports the development of a generalized BMPR system which overcomes those limitations. Model drugs (methylene blue and methyl orange) were immobilized in a pH-sensitive polymer [poly(methyl methacrylate-co-dimethylaminoethyl methacrylate)] which released only at low pH. Zinc oxide (ZnO) nanoparticles immobilized in a pH-insensitive matrix [poly(vinyl alcohol)] served as the barrier layer. The time required for acid to penetrate the barrier layer scaled with the ZnO concentration and with the square of the polymer thickness, allowing wide scaling of the delay time with only minor changes to the barrier layer. Harnessing the swelling pressure of the acid-sensitive hydrogel, each barrier/depot bilayer can delaminate upon solute release, directly exposing the next bilayer to the stimulant source. This system has demonstrated tuned release using a citric acid stimulant to produce up to ten pulses of model drug (methylene blue) over various preset timescales. This system has also demonstrated the alternate release of multiple solutes (methylene blue and methyl orange) at regular time intervals up to five pulses from a single BMPR device. For non-delaminating BMPR systems, spent bilayers impede stimulant diffusion to the inner layers and solute diffusion from the inner layers, increasing the delay time and the pulse width. To predict these changes, a computational model was constructed in FORTRAN. This model was extensively explored over a wide range of parameter space to understand the release behavior of various kinds of non-delaminating BMPR systems. The computer model also validates the performances of experimental… Advisors/Committee Members: Nuxoll, Eric E. (supervisor).

Subjects/Keywords: Barrier Films; Diffusion; Drug Delivery; Hydrogels; Polymers; Pulsatile Release; Chemical Engineering

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

APA (6^th Edition):

Gandhi, S. J. (2015). Barrier-mediated pulsatile release. (Doctoral Dissertation). University of Iowa. Retrieved from https://ir.uiowa.edu/etd/1601

Chicago Manual of Style (16^th Edition):

Gandhi, Swapnilkumar J. “Barrier-mediated pulsatile release.” 2015. Doctoral Dissertation, University of Iowa. Accessed February 28, 2021. https://ir.uiowa.edu/etd/1601.

MLA Handbook (7^th Edition):

Gandhi, Swapnilkumar J. “Barrier-mediated pulsatile release.” 2015. Web. 28 Feb 2021.

Vancouver:

Gandhi SJ. Barrier-mediated pulsatile release. [Internet] [Doctoral dissertation]. University of Iowa; 2015. [cited 2021 Feb 28]. Available from: https://ir.uiowa.edu/etd/1601.

Council of Science Editors:

Gandhi SJ. Barrier-mediated pulsatile release. [Doctoral Dissertation]. University of Iowa; 2015. Available from: https://ir.uiowa.edu/etd/1601

6. Champeau, Mathilde. Supercritical CO2 Assisted Impregnation to prepare Drug-eluting Polymer Implants : Imprégnation par voie CO2 supercritique pour préparer des implants polymère à libération contrôlée de principes actifs.

Degree: Docteur es, Polymères, 2014, Bordeaux; Université de Liège

URL: http://www.theses.fr/2014BORD0205

►

Le procédé d’imprégnation par voie CO2 supercritique est une solution prometteuse pour préparer des implants polymère à libération contrôlée de médicaments.Ce travail a permis de… (more)

▼

Le procédé d’imprégnation par voie CO2 supercritique est une solution prometteuse pour préparer des implants polymère à libération contrôlée de médicaments.Ce travail a permis de comprendre l’influence des paramètres gouvernant ce procédé et de préciser dans quelle mesure ce procédé peut être utilisé pour préparer des implants polymères chargés en médicament. Pour ce faire, nous avons combiné les informations obtenues grâce aux techniques classiques de caractérisation de polymères et à un dispositif que nous avons développé basé sur la micro-spectroscopie FTIR haute pression in situ.Dans cette étude, des fils de suture de PLLA, PP and PET ont été imprégné avec deux anti-inflammatoires (aspirine et kétoprofène).Tout d’abord, l’évolution du comportement des systèmes binaires médicament/CO2 (solubilité et spéciation) et polymère/CO2 (quantité de CO2 adsorbé, gonflement de la matrice, évolution de la microstructure et des propriétés de tension du polymère) a été déterminé en fonction de la pression et de la température. Ensuite, le procédé d’imprégnation a été étudié. L’influence des conditions expérimentales sur le taux d’imprégnation a été déterminée et expliquée par la quantité de CO2 adsorbé, le gonflement de la matrice, la solubilité du médicament, l’évolution de la microstructure du polymère et aussi l’affinité médicament/polymère. La matrice de PLLA a pu être plus largement imprégnée (jusqu’à 32%) que celles de PP et PET (5% max). Enfin, l’influence des conditions d’imprégnation et de dépressurisation sur le relargage a été démontrée sur le système PLLA/Kétoprofène, la durée de relargage variant de 3jours à 3mois.

The scCO2 impregnation process is a promising alternative to other manufacturing process to prepare drug-eluting polymer implants.This work enabled to rationalize the influence of the key parameters governing this process and to determine in which extent this process can be used to prepare drug-eluting implants. We have combined the information obtained with traditional polymer characterization techniques and a newly characterization set-up we have developed that is based on in situ FTIR micro-spectroscopy. We have worked on the impregnation of sutures made of PLLA, PP and PET with two anti-inflammatory drugs namely ketoprofen and aspirin.Firstly, the thermodynamic behaviors of the systems drug/CO2 (solubility and speciation of the drug) and polymer/CO2 (CO2 sorption, polymer swelling, evolution of the polymer microstructure and of the tensile properties) were studied as a function of pressure and temperature. Then, the scCO2 impregnation process was investigated. The impact of the operational conditions on the drug loading (contact time, pressure, temperature and depressurization conditions) was explored and accounted regarding to the CO2 sorption, the2swelling, the drug solubility as well as the changes in the polymer microstructure with the experimental conditions and the presence of the drug. The drug/polymer affinity was also explored. The tensile properties of the impregnated fibers were also…

Advisors/Committee Members: Tassaing, Thierry (thesis director), Howdle, Steven (thesis director), Boury, Frank (thesis director).

Subjects/Keywords: CO2 supercritique; Imprégnation; Implants en polymère; Libération contrôlée de médicament,; Micro-spectroscopie FTIR haute pression; Adsorption de CO2; Gonflement; Taux d’imprégnation,; Suture; Anti-inflammatoire; Supercritical CO2; Impregnation; Drug-eluting polymer implants; In situ FTIR micro-spectroscopy; CO2 sorption; Polymer swelling; Drug loading; Suture; Anti-inflammatory; Drug release

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

APA (6^th Edition):

Champeau, M. (2014). Supercritical CO2 Assisted Impregnation to prepare Drug-eluting Polymer Implants : Imprégnation par voie CO2 supercritique pour préparer des implants polymère à libération contrôlée de principes actifs. (Doctoral Dissertation). Bordeaux; Université de Liège. Retrieved from http://www.theses.fr/2014BORD0205

Chicago Manual of Style (16^th Edition):

Champeau, Mathilde. “Supercritical CO2 Assisted Impregnation to prepare Drug-eluting Polymer Implants : Imprégnation par voie CO2 supercritique pour préparer des implants polymère à libération contrôlée de principes actifs.” 2014. Doctoral Dissertation, Bordeaux; Université de Liège. Accessed February 28, 2021. http://www.theses.fr/2014BORD0205.

MLA Handbook (7^th Edition):

Champeau, Mathilde. “Supercritical CO2 Assisted Impregnation to prepare Drug-eluting Polymer Implants : Imprégnation par voie CO2 supercritique pour préparer des implants polymère à libération contrôlée de principes actifs.” 2014. Web. 28 Feb 2021.

Vancouver:

Champeau M. Supercritical CO2 Assisted Impregnation to prepare Drug-eluting Polymer Implants : Imprégnation par voie CO2 supercritique pour préparer des implants polymère à libération contrôlée de principes actifs. [Internet] [Doctoral dissertation]. Bordeaux; Université de Liège; 2014. [cited 2021 Feb 28]. Available from: http://www.theses.fr/2014BORD0205.

Council of Science Editors:

Champeau M. Supercritical CO2 Assisted Impregnation to prepare Drug-eluting Polymer Implants : Imprégnation par voie CO2 supercritique pour préparer des implants polymère à libération contrôlée de principes actifs. [Doctoral Dissertation]. Bordeaux; Université de Liège; 2014. Available from: http://www.theses.fr/2014BORD0205

University of Alberta

7. Comin, Lauren. Supercritical carbon dioxide processing for the extraction and delivery of flax bioactives.

Degree: PhD, Department of Agricultural, Food and Nutritional Science, 2011, University of Alberta

URL: https://era.library.ualberta.ca/files/j3860818h

► Flax is an oilseed praised for high omega-3 oil, fiber and lignan content. Supercritical carbon dioxide (SCCO2) can be used as a green solvent alternative… (more)

▼ Flax is an oilseed praised for high omega-3 oil, fiber and lignan content. Supercritical carbon dioxide (SCCO2) can be used as a green solvent alternative to process flax bioactives. SCCO2 extraction was used to remove lignan Secoisolariciresinol Diglucoside (SDG) from full fat and defatted whole flax seeds and hulls and hydrolyzed whole seed. Temperature, pressure and addition of ethanol modifier had no effect on CO2 loading of SDG. However, when seed was pre-hydrolyzed, significantly higher loading was obtained compared to other seed treatments, as hydrolysis reduced the size of SDG macromolecules and released free SDG. SCCO2 dried aerogels were formed from β-glucan and flax mucilage. Compared to 10% mucilage, 5% β-glucan aerogels had lower surface area (165.55 m2/g vs 201.13 m2 /g) and maintained less of their hydrogel volume (37.62% vs 56.90%), but had a similar density (0.19 g/cm3 for β-glucan and 0.16 g/cm3 for mucilage). SCCO2-dried aerogels showed significantly less volume shrinkage compared to air-dried gels and had a more uniform structure compared to freeze-dried gels. Pregelatinized corn starch (PGS) and β-glucan aerogels were impregnated with bioactive lipids. The effect of processing conditions, including temperature, pressure and flow mode were dependent on the complexity of the lipid, as well as the partition of the lipid between the matrix and the SCCO2 phase. Oleic acid had higher impregnation efficiency in PGS compared to flax oil because of higher purity and smaller molecular size and weight. For flax oil, its low solubility in SCCO2 limited its impregnation in PGS. For β-glucan aerogels, depending on when oil is incorporated (before, after or during drying), different impregnation efficiencies were achieved. FTIR and SEM results suggest oil has an effect on the gelation of β-glucan. SDG concentrate, Beneflax, was added to β-glucan and mucilage aerogels prior to SCCO2 drying. When Beneflax was added prior to gelation, regardless of technique, SDG concentration was not different. However, when hydrogels were impregnated by soaking in 70% ethanol Beneflax solutions, SDG recovery from aerogels was significantly lower. Overall, results suggest new uses for food-grade polymers using SCCO2 processing,including the formation of aerogels and impregnation of flax bioactives.

Subjects/Keywords: supercrtical CO2; impregnation; aerogel; flax; lignan

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

APA (6^th Edition):

Comin, L. (2011). Supercritical carbon dioxide processing for the extraction and delivery of flax bioactives. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/j3860818h

Chicago Manual of Style (16^th Edition):

Comin, Lauren. “Supercritical carbon dioxide processing for the extraction and delivery of flax bioactives.” 2011. Doctoral Dissertation, University of Alberta. Accessed February 28, 2021. https://era.library.ualberta.ca/files/j3860818h.

MLA Handbook (7^th Edition):

Comin, Lauren. “Supercritical carbon dioxide processing for the extraction and delivery of flax bioactives.” 2011. Web. 28 Feb 2021.

Vancouver:

Comin L. Supercritical carbon dioxide processing for the extraction and delivery of flax bioactives. [Internet] [Doctoral dissertation]. University of Alberta; 2011. [cited 2021 Feb 28]. Available from: https://era.library.ualberta.ca/files/j3860818h.

Council of Science Editors:

Comin L. Supercritical carbon dioxide processing for the extraction and delivery of flax bioactives. [Doctoral Dissertation]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/j3860818h

University of Illinois – Urbana-Champaign

8. Behl, Mayank. Desulfurization by reactive adsorption on oxide/metal composites.

Degree: PhD, 0300, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/49649

► Nanostructured oxides – undoped, doped, composites and nano-heterostructures – having different morphologies and compositions were synthesized, characterized and tested under realistic operating conditions for their… (more)

▼ Nanostructured oxides – undoped, doped, composites and nano-heterostructures – having different morphologies and compositions were synthesized, characterized and tested under realistic operating conditions for their role as potential reactive adsorbents and catalysts in different environmental related applications. More specifically, different zinc oxide based nanostructures were studied for high and low temperature desulfurization applications. In addition, the focus was on moving away from the traditional practice of using oxides only as support materials. Oxides have traditionally been assigned the role of support materials in applications involving catalysis. As support materials, they are either considered as inert or they do occasionally participate indirectly along with more active “dispersed” metals by “strong metal-substrate interaction”. This thesis presents results from a set of experiments with nanostructured oxide where reactive nature of the bulk oxide core is essential to the overall reaction. Most of the experimental schemes that constitute this thesis go beyond the role of oxides in surface reactivity to cases where bulk solid state reactivity is important. In experiments studying reactive desulfurization, different synthetic techniques were used to extend zinc oxide’s temperature range by combining structural and compositional modifications. To increase sulfur capacity and uptake rate of ZnO-based sorbents at low/high temperatures, it is necessary to achieve a rapid surface reaction and complete bulk sulfidation of the oxide. To attain this goal, surface activity and diffusion through the ZnS product layer, must be accelerated. Nano-structuring of oxides, controlling the size and morphology together with the thoughtful compositional changes can help attain the goal. But bulk of the research has concentrated only on improving surface reactivity. In chapter 3, where developing reactive ZnO based adsorbents for high temperature syngas-desulfurization is one of the goals, it was experimentally demonstrated that a branched nanofibrous architecture combined with mixed metal oxide based composition (Zn-Ti-O) offers significantly enhanced sorbent bulk reactivity and recyclability, without needing to cycle temperature. Zn-Ti-O based nanofibrous mats offer rapid reaction rates and efficient material utilization of the oxide core by overcoming rate limiting transport resistance, which often affects conventional pellet-based sorbents. Problems of higher energy use, sluggish reactions, incomplete regeneration and progressive decline in activity are successfully mitigated. Higher reactivity enables regeneration to be carried out at a temperature that is identical to the sulfidation step, preventing damage and extra energy use caused by alternating temperatures. The efficient regeneration of the adsorbent is also aided by structural features such as the growth of hierarchical nanostructures (secondary nanorods) and preferential stabilization of a wurtzite phase in the sulfidation product. Such unique features are… Advisors/Committee Members: Jain, Prashant K. (advisor), Yang, Hong (Committee Chair), Jain, Prashant K. (committee member), Schroeder, Charles M. (committee member), Seebauer, Edmund G. (committee member).

Subjects/Keywords: Metal oxides; Materials chemistry; Nanostructures; Desulfurization; Nanocomposites; Solid-state reaction; Catalysis; Strong Metal-Metal Oxide Interaction; Organo-sulfur degradation; Brønsted acidity; Sour gas; High temperature desulfurization; electrospinning; incipient wet impregnation

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APA (6^th Edition):

Behl, M. (2014). Desulfurization by reactive adsorption on oxide/metal composites. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/49649

Chicago Manual of Style (16^th Edition):

Behl, Mayank. “Desulfurization by reactive adsorption on oxide/metal composites.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 28, 2021. http://hdl.handle.net/2142/49649.

MLA Handbook (7^th Edition):

Behl, Mayank. “Desulfurization by reactive adsorption on oxide/metal composites.” 2014. Web. 28 Feb 2021.

Vancouver:

Behl M. Desulfurization by reactive adsorption on oxide/metal composites. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2142/49649.

Council of Science Editors:

Behl M. Desulfurization by reactive adsorption on oxide/metal composites. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/49649

Georgia Tech

9. Karimi, Miad. Investigation of high-pressure methane and syngas autoignition delay times.

Degree: PhD, Aerospace Engineering, 2019, Georgia Tech

URL: http://hdl.handle.net/1853/62295

► This thesis reports methane (CH4) and a syngas mixture (H2/CO=95:5) autoignition delay measurements relevant to operating conditions of supercritical carbon dioxide (sCO2) power cycle (100… (more)

▼ This thesis reports methane (CH4) and a syngas mixture (H2/CO=95:5) autoignition delay measurements relevant to operating conditions of supercritical carbon dioxide (sCO2) power cycle (100 to 300 bar) combustors. To acquire data at these conditions as part of this thesis, a new high-pressure shock tube is designed, fabricated and commissioned. The experiments are conducted for diluted carbon dioxide environments at 100 and 200 bar and at temperatures within the range of approximately 1100–1400 K. To investigate the chemical effect of CO2 at supercritical conditions, experiments are conducted at similar pressures and temperatures by substituting CO2 with an inert bath gas, Ar (argon). Obtaining ignition delay times in Ar bath gas allows to systematically study the chemical effect of CO2 on ignition chemistry. Methane ignition delay times are compared to several chemical kinetic models, such as Aramco 2.0, FFCM-1, HP-Mech, USC Mech II and GRI 3.0. For the conditions of this study, predictions of the Aramco 2.0 kinetic model show the overall best agreement with experimental measurements. Following the experimental data, brute-force sensitivity analyses and reaction pathway flux analyses are utilized to gain insight into details of the ignition chemistry of the fuels (CH4 and H2/CO=95:5). These analyses indicate that methyl (CH3) recombination to form ethane (C2H6) and oxidation of CH3 to form methoxide (CH3O) are the most important reactions controlling the ignition behavior of methane at temperatures greater than approximately 1250 K. However, at temperatures below approximately 1250 K, an additional reaction pathway for methyl radicals is found through CH3+O2+M=CH3O2+M, which leads to formation of methyldioxidanyl (CH3O2). This reaction pathway plays a distinct role in dictating the ignition trends at lower temperature conditions. Replacing CO2 with argon as the bath gas reveals that CO2 does not have major effects on ignition chemistry of CH4. A similar approach is taken to obtain experimental data at 100 bar and 200 bar for a syngas fuel mixture of 95% H2 (hydrogen) and 5% CO (carbon monoxide) in CO2 and Ar bath gasses. Aramco 2.0 kinetic model, FFCM-1 kinetic model, HP-Mech and USC Mech II show good agreement with the measured ignition delay times. Detailed sensitivity analyses of these kinetic models highlight the importance of the third-body reaction between hydrogen atoms (H) and oxygen molecules (O2) through H+O2+M=HO2+M to form hydroperoxyl (HO2). In both cases, irrespective of the diluents, this reaction is the most influential reaction to hinder ignition. Ignition delay times obtained from both mixtures not only show a similar trend, but also the same magnitude when compared to the CO2 mixture. While this observation may suggest that CO2 has no chemical effect on ignition chemistry, it is found to play a counterbalancing role on syngas ignition at the elevated pressures and temperatures of this study. CO2 increases the OH (hydroxyl) radical production by colliding with hydrogen peroxide (H2O2) through… Advisors/Committee Members: Ranjan, Devesh (advisor), Sun, Wenting (advisor), Menon, Suresh (committee member), Lieuwen, Timothy (committee member), Loutzenhiser, Peter (committee member).

Subjects/Keywords: High-pressure ignition delay times; Chemical kinetics; Supercritical CO2

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APA (6^th Edition):

Karimi, M. (2019). Investigation of high-pressure methane and syngas autoignition delay times. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62295

Chicago Manual of Style (16^th Edition):

Karimi, Miad. “Investigation of high-pressure methane and syngas autoignition delay times.” 2019. Doctoral Dissertation, Georgia Tech. Accessed February 28, 2021. http://hdl.handle.net/1853/62295.

MLA Handbook (7^th Edition):

Karimi, Miad. “Investigation of high-pressure methane and syngas autoignition delay times.” 2019. Web. 28 Feb 2021.

Vancouver:

Karimi M. Investigation of high-pressure methane and syngas autoignition delay times. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1853/62295.

Council of Science Editors:

Karimi M. Investigation of high-pressure methane and syngas autoignition delay times. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/62295

10. Amos, Daniel Michael. High pressure hydrates of CO2 & materials for carbon storage.

Degree: PhD, 2015, University of Edinburgh

URL: http://hdl.handle.net/1842/21031

► The class of water-ice compound known as gas hydrate has been of interest to science for sometime where, for instance, gas hydrates make excellent candidates… (more)

▼ The class of water-ice compound known as gas hydrate has been of interest to science for sometime where, for instance, gas hydrates make excellent candidates for studying the interactions of water and gas molecules. They are also of relevance to industry, where they present an interesting material for the separation, transport, and storage of different gases, and also due to the vast quantities of methane gas that are trapped in natural gas hydrate formations. While much is known about the behaviour of many gas hydrate systems at high-pressure, the CO2 hydrate system is less well studied, with apparent hydrate dissociation at just 10 kbar, and (prior to this work) an unsolved crystalline phase in the pressure range 6-10 kbar. In this work the CO2-H2O system has been studied at high-pressure and, by heating samples to the liquid state and observing their behaviour on refreezing, it has been confirmed that there are indeed no hydrate phases in the system above 10 kbar (up to at least 40 kbar). While performing this investigation, an interesting effect of CO2 on the behaviour of water crystallisation was also observed, and additionally, a simple yet effective technique for making solubility measurements in the system at high-pressure has been discovered. Using a combination of neutron and x-ray diffraction techniques, the crystal structure of the previously unsolved ‘HP’ CO2 hydrate phase has been determined by ab-initio methods. It has been found to be a new gas hydrate structure, but is shared by a small number of Zintl compounds, and may also be common to the unsolved C0 phase of H2 hydrate. The structure has a characteristic spiral of guest molecule sites, leading to its suggested label as the spiral hydrate structure (s-Sp). Its composition has been measured as a tri-hydrate, and the compressibility of s-Sp and the low-pressure s-I CO2 hydrate phases have also been measured. On cooling to 77 K it has been discovered that a third CO2 hydrate phase is formed with a significantly larger unit cell, which is thought to possess a structure similar to that of s-Sp, but with an ordered arrangement of CO2 molecules. Finally, a pilot study of the high-pressure behaviour of the binary H2-CO2 hydrate system has been performed. Using Raman spectroscopy it has been found that a new mixed hydrate phase exists in the pressure range 5-15 kbar, and it is speculated that this could exhibit a freely tunable H2/CO2 content, based on suspicion that it forms the s-Sp structure. Additionally, it has been found that H2 and CO2 chemically react at room temperature, when compressed to ~5 kbar in a rhenium gasket. From the Raman spectrum this reaction product has been identified to be aqueous-methanol.

Subjects/Keywords: 665; high-pressure; gas hydrates; CO2; neutron diffraction; charge flipping

11 more images…

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APA (6^th Edition):

Amos, D. M. (2015). High pressure hydrates of CO2 & materials for carbon storage. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/21031

Chicago Manual of Style (16^th Edition):

Amos, Daniel Michael. “High pressure hydrates of CO2 & materials for carbon storage.” 2015. Doctoral Dissertation, University of Edinburgh. Accessed February 28, 2021. http://hdl.handle.net/1842/21031.

MLA Handbook (7^th Edition):

Amos, Daniel Michael. “High pressure hydrates of CO2 & materials for carbon storage.” 2015. Web. 28 Feb 2021.

Vancouver:

Amos DM. High pressure hydrates of CO2 & materials for carbon storage. [Internet] [Doctoral dissertation]. University of Edinburgh; 2015. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1842/21031.

Council of Science Editors:

Amos DM. High pressure hydrates of CO2 & materials for carbon storage. [Doctoral Dissertation]. University of Edinburgh; 2015. Available from: http://hdl.handle.net/1842/21031

Delft University of Technology

11. van Beusekom, Vincent (author). Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:b8e40171-619e-4fcb-9175-734484291999

► Due to rising concerns about climate change, a lot of research is currently underway with respect to the development of new technologies which can contribute… (more)

▼ Due to rising concerns about climate change, a lot of research is currently underway with respect to the development of new technologies which can contribute to the decline of atmospheric CO₂, and will allow further penetration of renewables into the energy mix. A promising technology which is currently actively researched is the electrochemical reduction of CO₂ (ERC). This technology utilizes otherwise polluting and unwanted CO₂ and converts it into value-added products under the influence of an electrical current. The process can therefore be designed as an energy storage mechanism since electrical energy is stored as chemical bonds. In this research, ERC towards formic acid has been investigated from two perspectives. First, the feasibility of the commercial production of formic acid compared to other products of ERC was investigated. The electrochemical production of the most common reduction products have been compared based on production costs, energy storage capabilities, toxicity and manageability. Due to the relatively low energy consumption for 2-electron products, namely formic acid, carbon monoxide and oxalic acid, it is found that these products have the most promising business case. Additionally, ERC to formic acid is best studied compared to other products, and high selectivities are commonly reported. Formic acid and methanol are liquid at atmospheric conditions, which is beneficial as relatively large amounts of energy per unit volume can be stored without the need of additional compression or cooling. This will also allow for easy transportation. As hydrogen carrier, formic acid has the advantage that it can be decomposed in H2 and CO₂ near room temperature. In the second part of this research, the use of numerical modeling to study the reduction of CO₂ in an electrochemical cell towards formic acid/formate at elevated CO₂ pressures is presented. The model investigates to impact on the cathodic half-cell of a cell designed for the reduction of CO₂ in aqueous electrolyte solutions at a constant temperature of 25℃, simultaneously assuming non-limiting conditions with respect to the anodic half-cell. The modeled part of the cell has been divided in three main regions, namely the bulk, cathode surface region and the electrode surface, which are discussed separately. The bulk is assumed to be the region of equilibrated concentrations which are constant in time, as they are not dynamically influenced by any mass transport phenomena. Reactants are supplied from the bulk to the electrode surface and products are removed vice versa via the cathode surface region, which is a thin region in the vicinity of the electrode. The transfer of species within this region and the chemical reactions between the species, form a system of diffusion-reaction equations. This system is solved numerically using appropriate boundary conditions. The actual reduction of CO₂ occurs on the electrode surface, and the kinetics of the… Advisors/Committee Members: de Jong, Wiebren (mentor), van den Broeke, Peter (graduation committee), Haverkort, Willem (graduation committee), Hartkamp, Remco (graduation committee), Buijnsters, Ivan (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: CO2 reduction; formic acid; high pressure; electrochemical reduction; formate

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APA (6^th Edition):

van Beusekom, V. (. (2018). Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b8e40171-619e-4fcb-9175-734484291999

Chicago Manual of Style (16^th Edition):

van Beusekom, Vincent (author). “Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure.” 2018. Masters Thesis, Delft University of Technology. Accessed February 28, 2021. http://resolver.tudelft.nl/uuid:b8e40171-619e-4fcb-9175-734484291999.

MLA Handbook (7^th Edition):

van Beusekom, Vincent (author). “Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure.” 2018. Web. 28 Feb 2021.

Vancouver:

van Beusekom V(. Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Feb 28]. Available from: http://resolver.tudelft.nl/uuid:b8e40171-619e-4fcb-9175-734484291999.

Council of Science Editors:

van Beusekom V(. Electrochemical Reduction of Carbon Dioxide: Modeling the electrochemical conversion of CO₂ to Formic Acid under high pressure. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:b8e40171-619e-4fcb-9175-734484291999

Delft University of Technology

12. Chang, Kelly (author). Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:154af986-f9d5-40d3-a9bf-487b9545a730

► Biogas is the well-known product of Anaerobic Digestion (AD), but nowadays, the intermediate products (volatile fatty acids - VFAs) of anaerobic metabolism have gained increasing… (more)

▼ Biogas is the well-known product of Anaerobic Digestion (AD), but nowadays, the intermediate products (volatile fatty acids - VFAs) of anaerobic metabolism have gained increasing attention inside the “carboxylate platform”. However, steering and optimizing the process for selective metabolite production is still an unraveled task inside this field since it relies on the manipulation of operational parameters. The objective is to understand the conversion of glucose and glycerol in the mixed culture of anaerobic digestion to unravel possibilities to steer product formation. Glucose and glycerol are the main components in the waste streams of beverage and biodiesel industries. Regarding the degradation pathways in AD, both glucose and glycerol are oxidized to pyruvate by fermentative bacteria to obtain energy and metabolic intermediates under anaerobic conditions through the same intermediate, glyceraldehyde-3-phosphate. Pyruvate, the key branching-point, allows the process to enter different metabolic pathways which lead to the formation of various metabolites. Under the fermentation conditions, redox balance is necessary to be maintained through terminal electron transfer to internally produced compounds. Since glycerol has a higher degree of reduction than glucose (Glucose: 0.33 NADH/C-Glucose; Glycerol: 0.66 NADH/C-Glycerol), the conversion of glycerol into pyruvate generates a double amount of reducing equivalents. On the one hand, this provides the advantage of higher theoretical product yield of reduced compounds. On the other hand, half of the glucose is lost as CO2 during the fermentation, and this reduces the product yield.1 Therefore, we assume that elevated pCO2 could have a more significant detrimental effect on glucose fermentation. In this research, batch experiments at different pCO2 (0.3, 1, 3, 5, 8 bar) were performed, and different types of measurements and analyses were employed to monitor the pCO2 effect on the metabolism. We designed some of the potential pathways of glucose and glycerol conversion under elevated pCO2. The elevated pCO2 converged the product spectrum of both substrates towards propionate production but affected the degradation and production phase of propionate and acetate. Initial pCO2 of 0.3 bar and 1 bar did not cause visible inhibition on the propionate production of both substrates. However, the propionate degradation was kinetically affected under 0.3 and 1 bar initial pCO2. Although propionate was degradable, its degradation phase at 1 bar initial pCO2 was longer than 0.3 bar. On the contrary, when the pCO2 was elevated to 3, 5, and 8 bar, not only the propionate production phase became longer, but also the maximum concentration became lower on both substrates. Moreover, propionate degradation was ceased. The lower propionate production was suspected to be due to the inhibition of NADH production as a consequence of the elevated pCO2 effect. The undegradable propionate might be attributed to unfavored decarboxylation reactions under elevated pCO2. The enrichment approach… Advisors/Committee Members: Lindeboom, Ralph (mentor), Ceron Chafla, Pamela (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: High-pressure anaerobic digestion; Resource recovery; CO2 injection

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APA (6^th Edition):

Chang, K. (. (2019). Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:154af986-f9d5-40d3-a9bf-487b9545a730

Chicago Manual of Style (16^th Edition):

Chang, Kelly (author). “Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture.” 2019. Masters Thesis, Delft University of Technology. Accessed February 28, 2021. http://resolver.tudelft.nl/uuid:154af986-f9d5-40d3-a9bf-487b9545a730.

MLA Handbook (7^th Edition):

Chang, Kelly (author). “Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture.” 2019. Web. 28 Feb 2021.

Vancouver:

Chang K(. Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Feb 28]. Available from: http://resolver.tudelft.nl/uuid:154af986-f9d5-40d3-a9bf-487b9545a730.

Council of Science Editors:

Chang K(. Steering product formation In high-pressure anaerobic systems: The effect of elevated pCO2 on the degradation of glucose and glycerol by a mixed culture. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:154af986-f9d5-40d3-a9bf-487b9545a730

University of Oklahoma

13. Omosebi, Omotayo. Mechanical Degradation of Well Cement in HPHT Carbonic Acid Environment: Experimental Studies and Mathematical Modeling.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/45042

► Cement exposed to brine saturated with CO2 gas undergoes combination of chemical processes leading to mechanical degradation after placement behind the casing. These processes are… (more)

▼ Cement exposed to brine saturated with CO2 gas undergoes combination of chemical processes leading to mechanical degradation after placement behind the casing. These processes are influenced by downhole conditions such as temperature, pressure, and the composition of CO2 gas. The objectives of this study are to understand the mechanisms governing the degradation of well cement and to quantify the rate of deterioration using experimental and modeling techniques. Experiments were conducted by exposing Classes G and H cement to CO2-saturated brine solution under HPHT conditions. Temperature was varied between 100°F and 430°F while pressure was varied between 3,000 psi and 9,000 psi. To generate aggressive fluid around the cement, the composition of CO2 gas was varied by injecting a mixture of gases, containing varying compositions of carbon dioxide and methane, into the HPHT autoclave. Compressive strength was measured before and after exposure to determine the alteration in mechanical integrity due to chemical attack. In addition, fluid samples were collected after the test and chemical analysis was conducted to quantify pH and calcium content. These are supported with porosity, permeability, FTIR, XRD, EDX, SEM, and visual inspection of the degraded specimens. Besides, a methodology for coupling the governing mechanisms involved in cement degradation is proposed and a fully-coupled model is developed. In both classes of cement, overall mechanical behavior shows improvement, although the specimens were chemically degraded. Three mechanisms of degradation were identified as the driver of the degradation process. Structural transformation of calcium silicates at elevated temperature leads to slight retrogression in strength. Carbonation reaction improves mechanical strength but reduces porosity and permeability. Bicarbonation and leaching reactions increase porosity and permeability leading to the loss of mechanical strength. These mechanisms are interrelated; the overriding process governs the rate of degradation. Within the experimental time scale adopted in this study, carbonation is the rate-controlling process because overall mechanical integrity is improved. Parametric studies of the effects of downhole parameter on mechanical behavior show that cement degradation is sensitive to temperature, pressure, and CO2 gas composition. Relative to CO2 gas composition and pressure, temperature is identified as the most critical downhole parameter for cement design in HPHT carbonic acid environment. Comparison between experimental data and the model developed in this study shows good agreement. Very limited studies have been conducted to evaluate cement performance in HPHT acidic environment. In previous investigations, alterations in the mechanical strength of well cement in hostile environments have not been thoroughly examined. This study provides understanding on how the mechanical integrity of commonly used well cement is affected by aggressive and harsh downhole conditions. The outcome of this study lays the ground… Advisors/Committee Members: Ahmed, Ramadan (advisor), Pigott, John (committee member), Shah, Subhash (committee member), Pournik, Maysam (committee member), Ghassemi, Ahmad (committee member).

Subjects/Keywords: Cement Degradation; High Pressure and High Temperature (HPHT); Acid Attack; Carbon Dioxide (CO2)-Saturated Brine

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APA (6^th Edition):

Omosebi, O. (2016). Mechanical Degradation of Well Cement in HPHT Carbonic Acid Environment: Experimental Studies and Mathematical Modeling. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/45042

Chicago Manual of Style (16^th Edition):

Omosebi, Omotayo. “Mechanical Degradation of Well Cement in HPHT Carbonic Acid Environment: Experimental Studies and Mathematical Modeling.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed February 28, 2021. http://hdl.handle.net/11244/45042.

MLA Handbook (7^th Edition):

Omosebi, Omotayo. “Mechanical Degradation of Well Cement in HPHT Carbonic Acid Environment: Experimental Studies and Mathematical Modeling.” 2016. Web. 28 Feb 2021.

Vancouver:

Omosebi O. Mechanical Degradation of Well Cement in HPHT Carbonic Acid Environment: Experimental Studies and Mathematical Modeling. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/11244/45042.

Council of Science Editors:

Omosebi O. Mechanical Degradation of Well Cement in HPHT Carbonic Acid Environment: Experimental Studies and Mathematical Modeling. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/45042

Virginia Tech

14. Zhang, Kaiyi. CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs.

Degree: MS, Mining Engineering, 2019, Virginia Tech

URL: http://hdl.handle.net/10919/93728

► The new technologies to recover unconventional resources in oil and gas industry, such as fracturing and horizontal drilling, boosted the production of shale gas and… (more)

▼ The new technologies to recover unconventional resources in oil and gas industry, such as fracturing and horizontal drilling, boosted the production of shale gas and tight oil in 21st century and contributed to the North America oil and gas production. Although the new technologies and strong demand spiked the production of tight oil resources, there are still unknowns of oil and gas flow mechanisms in tight rock reservoirs. As we know, the oil and gas resources are stored in the pores of reservoir formation rock. During production process, the oil and gas are pushed into production wells by formation pressure. However, the pore radius of shale rock is extremely small (around nanometers), which reduces the flow rate of oil and gas and raises capillary pressure in pores. The high capillary pressure will alter the oil and gas phase behavior and it may influence the value of minimum miscibility pressure (MMP), which is an important design parameter for CO2 injection (an important technology to raise production). To investigate this influence, we changed classical model with considering capillary pressure and this modified model is implemented in different methods to calculate MMP. The results show that CO2 -MMP in shale reservoirs are affected by capillary pressure and the results from different methods match well. Moreover, in tight rock reservoirs, the heterogeneous pore size distribution, such as fractures in reservoirs, may affect the flow of oil and gas and MMP value. So, this work also investigates the effect of pore size heterogeneity on oil and gas flow mechanisms. According to the simulation results, compositional gradient forms in heterogeneous nanopores of tight reservoirs and this gradient will cause diffusion which will dominate the other fluid flow mechanisms. Therefore, we always need to consider molecular diffusion in the simulation model for shale reservoirs. Advisors/Committee Members: Nojabaei, Bahareh (committeechair), Boreyko, Jonathan B. (committee member), Ripepi, Nino S. (committee member).

Subjects/Keywords: Pore Confinement Effect; Gas-oil Capillary Pressure; CO2 Injection; Minimum Miscibility Pressure; Shale Nano-pore; Pore Size Heterogeneity; Molecular Diffusion

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APA (6^th Edition):

Zhang, K. (2019). CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/93728

Chicago Manual of Style (16^th Edition):

Zhang, Kaiyi. “CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs.” 2019. Masters Thesis, Virginia Tech. Accessed February 28, 2021. http://hdl.handle.net/10919/93728.

MLA Handbook (7^th Edition):

Zhang, Kaiyi. “CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs.” 2019. Web. 28 Feb 2021.

Vancouver:

Zhang K. CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10919/93728.

Council of Science Editors:

Zhang K. CO2 Minimum Miscibility Pressure and Recovery Mechanisms in Heterogeneous Low Permeability Reservoirs. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/93728

University of Akron

15. Druesedow, Charles Joseph. Pressure Control System for the Electrospinning Process: Non-invasive Fluid Level Detection Using Infrared and Ultrasonic Sensors.

Degree: MS, Mechanical Engineering, 2008, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1217275502

► Electrospinning is a method for producing micro and nano sized synthetic fibers through the use of electrostatic forces. This phenomenon has been known since early… (more)

▼ Electrospinning is a method for producing micro and nano sized synthetic fibers through the use of electrostatic forces. This phenomenon has been known since early in the 20th century, but has had an increase in interest since the 1990's due to their potential applications in textiles, electronics, and the biomedical field. To make electrospinning a commercially viable fiber production method requires the high volume production of continuous, uniform diameter fibers that are free of defects. To achieve greater control over the process variables that affect the fiber formation, a scaleable closed loop control system that can maintain a constant pressure at the capillary tip was designed. Two sensing technologies, infrared and ultrasonic, were used and compared for their ability to detect the height of the polymer solution in the electrospinning fluid container. The air pressure above the solution was measured with a pressure transducer and adjusted through a controllable syringe pump that was controlled through a custom LABVIEW program. A simulation of the jet formation was also performed by programming the derived equation of motion of the electrospun jet in MATLAB. The closed loop electrospinning system was successful at controlling and maintaining a constant pressure at the capillary tip to within 2% of the specified pressure over a 24-hour period. The control system was also able to create a defect free fiber mat when the pressure and voltage at the capillary tip were carefully selected. The adjustments of the pressure at the capillary tip did not show a strong correlation to controlling the fiber diameter or uniformity. Though a closed loop electrospinning control system was designed and implemented, the use of pressure control at the capillary tip to create a closed loop control system for the electrospinning process may not be the optimal solution for controlling the diameter of the produced fibers.The simulation of the jet using MATLAB's differential equation solver, ode45, was successful but limited in accuracy by the number of beads that could be used in the simulation. Advisors/Committee Members: Batur, Celel (Advisor), Cakmak, Miko (Advisor).

Subjects/Keywords: Mechanical Engineering; Polymers; Electrospinning; Control System; Pressure; Infrared; Ultrasonic

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APA (6^th Edition):

Druesedow, C. J. (2008). Pressure Control System for the Electrospinning Process: Non-invasive Fluid Level Detection Using Infrared and Ultrasonic Sensors. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1217275502

Chicago Manual of Style (16^th Edition):

Druesedow, Charles Joseph. “Pressure Control System for the Electrospinning Process: Non-invasive Fluid Level Detection Using Infrared and Ultrasonic Sensors.” 2008. Masters Thesis, University of Akron. Accessed February 28, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1217275502.

MLA Handbook (7^th Edition):

Druesedow, Charles Joseph. “Pressure Control System for the Electrospinning Process: Non-invasive Fluid Level Detection Using Infrared and Ultrasonic Sensors.” 2008. Web. 28 Feb 2021.

Vancouver:

Druesedow CJ. Pressure Control System for the Electrospinning Process: Non-invasive Fluid Level Detection Using Infrared and Ultrasonic Sensors. [Internet] [Masters thesis]. University of Akron; 2008. [cited 2021 Feb 28]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1217275502.

Council of Science Editors:

Druesedow CJ. Pressure Control System for the Electrospinning Process: Non-invasive Fluid Level Detection Using Infrared and Ultrasonic Sensors. [Masters Thesis]. University of Akron; 2008. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1217275502

RMIT University

16. Panyoyai, N. Fundamental studies of vitamin diffusional mobility in high-solid hydrocolloids matrices.

Degree: 2016, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:161594

► Whilst it has been long known that bioactive compounds can be preserved within a high-solids environment, the precise nature of the effect of processing time… (more)

▼ Whilst it has been long known that bioactive compounds can be preserved within a high-solids environment, the precise nature of the effect of processing time and temperature on bioactivity and its delivery is not entirely understood. This thesis has been designed to provide fundamental information on the kinetics of vitamin release from high-solid hydrocolloid matrices. Mathematical modelling based on high-utility empirical relations in combination with theoretical schools of thought has considerable potential for innovative product development and is employed presently. To understand the molecular interactions of ascorbic acid in a high methoxy pectin/polydextrose and thiamine in k-carrageenan/glucose syrup systems, we utilised the combined framework of free volume theory with the concept of effective diffusion coefficient. Our modelling has taken into account the amorphous nature of the polymeric matrices, which are cable of forming cohesive three dimensional networks, their geometry and the direction of diffusion pathways for the bioactive compounds within the surrounding solid-like environment. Improved understanding of the underlying molecular process was achieved by relating the network glass transition temperature to release patterns of the vitamins within the structured matrices. This free-volume driven effect is further modelled with a diffusion mechanism for delivery of the vitamins. This study also develops a systematic protocol of experimentation and theory to rationalise the diffusional patterns of nicotinic acid in whey protein and tocopheryl acetate in modified waxy maize starch microcapsules, but outcomes should have generic interest in the structural relaxation of polymer-vitamin composites. Industrial application may emanate from the use of spray drying to achieve multiple droplets processing into high-solids systems with well characterised techno-functionality. It is thus documented that vitamin encapsulating matrices are amorphous in nature with a well-defined mechanical glass transition temperature (Tg). The concept of free volume is operative in the viscoelastic functions of the glassy matrix whose relaxation is distinct from the diffusional mobility of the microconstituent. Temperature variability in the transfer of the vitamin was conveniently analysed with Fick’s second law to unveil the effective diffusion coefficient. This is affected by the vitrification state of the polymeric networks. Indeed, it is quite remarkable that a comprehensive relationship between free volume of the polymeric chain segments and diffusion rates of both vitamins was achieved in this work. In conclusion, the four experimental chapters of this thesis have documented the presence of a mechanical Tg in hydrocolloid systems, and this have been modelled with the WLF equation/free volume theory. This has then formed the basis for a study of the inclusion of vitamins and monitoring their diffusional mobility from high solid matrices. Evidence of non-Fickian phenomena was observed that allowed estimation of the…

Subjects/Keywords: Fields of Research; Food polymers; Vitamins; Glass transition; Release kinetics; High-solid matrices

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APA (6^th Edition):

Panyoyai, N. (2016). Fundamental studies of vitamin diffusional mobility in high-solid hydrocolloids matrices. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:161594

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):

Panyoyai, N. “Fundamental studies of vitamin diffusional mobility in high-solid hydrocolloids matrices.” 2016. Thesis, RMIT University. Accessed February 28, 2021. http://researchbank.rmit.edu.au/view/rmit:161594.

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

MLA Handbook (7^th Edition):

Panyoyai, N. “Fundamental studies of vitamin diffusional mobility in high-solid hydrocolloids matrices.” 2016. Web. 28 Feb 2021.

Vancouver:

Panyoyai N. Fundamental studies of vitamin diffusional mobility in high-solid hydrocolloids matrices. [Internet] [Thesis]. RMIT University; 2016. [cited 2021 Feb 28]. Available from: http://researchbank.rmit.edu.au/view/rmit:161594.

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

Council of Science Editors:

Panyoyai N. Fundamental studies of vitamin diffusional mobility in high-solid hydrocolloids matrices. [Thesis]. RMIT University; 2016. Available from: http://researchbank.rmit.edu.au/view/rmit:161594

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

17. Perko, Tina. FORMULACIJA IN KARAKTERIZACIJA NARAVNIH POLIMERNIH NOSILCEV ZA VEZAVO PIGMENTOV.

Degree: 2014, Univerza v Mariboru

URL: https://dk.um.si/IzpisGradiva.php?id=46480 ; https://dk.um.si/Dokument.php?id=68524&dn= ; https://plus.si.cobiss.net/opac7/bib/18195222?lang=sl

► Prvi del doktorske disertacije je namenjen raziskavam faznih ravnotežij trigliceridov v sub- in superkritičnih fluidih. Podatki so ključni za nadalnje načrtovanje visokotlačnih separacijskih in formulacijskih… (more)

▼ Prvi del doktorske disertacije je namenjen raziskavam faznih ravnotežij trigliceridov v sub- in superkritičnih fluidih. Podatki so ključni za nadalnje načrtovanje visokotlačnih separacijskih in formulacijskih procesov, saj so pripomogli k izboljšanju določenih industrijskih procesov v smeri okoljevarstva in kvalitete proizvodov. Za določitev topnosti glicerol tristearata-zgoščeni plini in glicerol trioleata-zgoščeni plini smo uporabili visokotlačno optično celico. Meritve smo izvedli pri različnih temperaturah (30, 50, 70 in 90 °C) in tlakih do 600 bar. Cilj našega eksperimentalnega dela je bilo pridobiti podatke o faznih ravnotežjih za glicerol tristearat in glicerol trioleat v sistemih superkritični CO2 in SF6, ki so ključnega pomena za optimizacijo visokotlačnih separacijskih in formulacijskih procesov. Podatkov o faznih ravnotežij glicerol tristearata-SF6 in glicerol trioleata-SF6 v literaturi ni. Pridobljeni podatki so novi in odpirajo nove perspektive za uporabo SF6 kot topila za različne nosilce. Za raziskave vpliva tlaka na temperaturo tališča in določitev talilne toplote v različnih plinih (dušik in CO2) smo uporabili visokotlačni DSC. Prav tako smo določiti topnosti in difuzijske koeficiente superkritičnega CO2 v različnih naravnih polimerih, ki se uporabljajo v prehrambeni industriji kot vezivo in sicer v različnih celulozah in škrobih. Topnost CO2 v polimeru je odvisna od temperature in tlaka, ter povzroča njegovo nabrekanje in s tem znižanje viskoznosti polimera. S povišanjem topnosti CO2 v polimeru se povečuje tudi masa polimera. Za določanje topnosti CO2 in difuzije smo uporabili magnetno suspenzijsko tehtnico. Meritve smo izvedli s pomočjo magnetne suspenzijske tehtnice pri različnih temperaturah (40, 60 in 80 °C) in tlakih do 300 bar. Določili smo visoke vrednosti topnosti in difuzijskih koeficientov ob izpostavitvi polimerov SC CO2. V nobenem primeru ni prišlo do raztapljanja polimera, ampak je polimer absorbiral CO2 in nabreknil. Iz dobljenih podatkov je razvidno, da topnost CO2 v polimerih z zviševanjem tlaka narašča in z zviševanjem temeperature pada. Zviševanje tlaka povzroča povečanje gostote plina in s tem večjo topnost, pri čemer se poveča volumen polimera. Z zviševanjem temperature pa se znižuje gostota plina. Difuzijski koeficienti CO2 so odvisni od koncentracije CO2 v polimeru. Na začetku se vrednosti difuzijskega koeficienta s povečanjem topnosti dvigajo, dokler CO2 ne zapolni vseh prostih praznin v polimeru, nato pa začnejo te vrednosti padati zaradi delovanja hidrostatičnega tlaka. Z določitvijo topnosti in difuzijskega koeficienta CO2 v polimerih pri določeni temperaturi in tlaku, smo pridobili več podatkov o faznem ravnotežju polimer-plin, ki so pomembni za razumevanje vpliva in optimiranje procesnih parametrov. V zadnjem delu doktorske disertacije smo vezali naravno rumeno barvilo kurkumin iz začimbe in 10 % tekočega ekstrakta na nosilce kot so trigliceridi, polietilen glikol, ciklodekstrin, celuloze in škrobi. Raziskovali smo različne kombinacije zmesi barvil in različnih… Advisors/Committee Members: Škerget, Mojca.

Subjects/Keywords: trigliceridi; superkritični CO2; SF6; S – L fazni prehodi; ravnotežne topnosti; naravni polimeri; difuzijski koeficient; kurkuma; PGSSTM; superkritične ekstrakcije; kurkuminoidi; nanoenkapsulacija; sproščanje aktivne substance; ekonomska analiza; triglycerides in supercritical CO2; SF6; S - L phase transitions; equilibrium solubility; natural polymers; diffusion coefficient; turmeric; PGSSTM; supercritical extraction; curcuminoids; nanoencapsulation; the release of active substances; the economic analysis; info:eu-repo/classification/udc/543.635.32:54-139:547.979.4(043.3)

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APA (6^th Edition):

Perko, T. (2014). FORMULACIJA IN KARAKTERIZACIJA NARAVNIH POLIMERNIH NOSILCEV ZA VEZAVO PIGMENTOV. (Doctoral Dissertation). Univerza v Mariboru. Retrieved from https://dk.um.si/IzpisGradiva.php?id=46480 ; https://dk.um.si/Dokument.php?id=68524&dn= ; https://plus.si.cobiss.net/opac7/bib/18195222?lang=sl

Chicago Manual of Style (16^th Edition):

Perko, Tina. “FORMULACIJA IN KARAKTERIZACIJA NARAVNIH POLIMERNIH NOSILCEV ZA VEZAVO PIGMENTOV.” 2014. Doctoral Dissertation, Univerza v Mariboru. Accessed February 28, 2021. https://dk.um.si/IzpisGradiva.php?id=46480 ; https://dk.um.si/Dokument.php?id=68524&dn= ; https://plus.si.cobiss.net/opac7/bib/18195222?lang=sl.

MLA Handbook (7^th Edition):

Perko, Tina. “FORMULACIJA IN KARAKTERIZACIJA NARAVNIH POLIMERNIH NOSILCEV ZA VEZAVO PIGMENTOV.” 2014. Web. 28 Feb 2021.

Vancouver:

Perko T. FORMULACIJA IN KARAKTERIZACIJA NARAVNIH POLIMERNIH NOSILCEV ZA VEZAVO PIGMENTOV. [Internet] [Doctoral dissertation]. Univerza v Mariboru; 2014. [cited 2021 Feb 28]. Available from: https://dk.um.si/IzpisGradiva.php?id=46480 ; https://dk.um.si/Dokument.php?id=68524&dn= ; https://plus.si.cobiss.net/opac7/bib/18195222?lang=sl.

Council of Science Editors:

Perko T. FORMULACIJA IN KARAKTERIZACIJA NARAVNIH POLIMERNIH NOSILCEV ZA VEZAVO PIGMENTOV. [Doctoral Dissertation]. Univerza v Mariboru; 2014. Available from: https://dk.um.si/IzpisGradiva.php?id=46480 ; https://dk.um.si/Dokument.php?id=68524&dn= ; https://plus.si.cobiss.net/opac7/bib/18195222?lang=sl

University of Toronto

18. Barua, Arup. Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures.

Degree: 2012, University of Toronto

URL: http://hdl.handle.net/1807/33333

►

Laminar axisymmetric syngas-air, syngas-methane mixture-air and biogas-air diffusion fames were studied over the pressure range of 5 to 20 atm to investigate the effect of… (more)

Subjects/Keywords: Soot formation; Diffusion flames; Alternative turbine fuels; High pressure expeimentation; 0538

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APA (6^th Edition):

Barua, A. (2012). Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/33333

Chicago Manual of Style (16^th Edition):

Barua, Arup. “Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures.” 2012. Masters Thesis, University of Toronto. Accessed February 28, 2021. http://hdl.handle.net/1807/33333.

MLA Handbook (7^th Edition):

Barua, Arup. “Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures.” 2012. Web. 28 Feb 2021.

Vancouver:

Barua A. Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1807/33333.

Council of Science Editors:

Barua A. Soot Formation in Diffusion Flames of Alternative Turbine Fuels at Elevated Pressures. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/33333

University of Toronto

19. Intasopa, Gorngrit. Soot Measurements in High-pressure Diffusion Flames of Gaseous and Liquid Fuels.

Degree: 2011, University of Toronto

URL: http://hdl.handle.net/1807/27342

►

Methane-air, ethane-air, and n-heptane-air over-ventilated co-flow laminar diffusion flames were studied up to pressures of 2.03, 1.52, and 0.51 MPa, respectively, to determine the effect… (more)

Subjects/Keywords: combustion; soot; diffusion flames; high pressure; methane; ethane; heptane; 0538

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APA (6^th Edition):

Intasopa, G. (2011). Soot Measurements in High-pressure Diffusion Flames of Gaseous and Liquid Fuels. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/27342

Chicago Manual of Style (16^th Edition):

Intasopa, Gorngrit. “Soot Measurements in High-pressure Diffusion Flames of Gaseous and Liquid Fuels.” 2011. Masters Thesis, University of Toronto. Accessed February 28, 2021. http://hdl.handle.net/1807/27342.

MLA Handbook (7^th Edition):

Intasopa, Gorngrit. “Soot Measurements in High-pressure Diffusion Flames of Gaseous and Liquid Fuels.” 2011. Web. 28 Feb 2021.

Vancouver:

Intasopa G. Soot Measurements in High-pressure Diffusion Flames of Gaseous and Liquid Fuels. [Internet] [Masters thesis]. University of Toronto; 2011. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/1807/27342.

Council of Science Editors:

Intasopa G. Soot Measurements in High-pressure Diffusion Flames of Gaseous and Liquid Fuels. [Masters Thesis]. University of Toronto; 2011. Available from: http://hdl.handle.net/1807/27342

King Abdullah University of Science and Technology

20. Abdelgadir, Ahmed Gamaleldin. Numerical Investigation of Soot Formation in Non-premixed Flames.

Degree: Physical Science and Engineering (PSE) Division, 2017, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/625044

► Soot is a carbon particulate formed as a result of the combustion of fossil fuels. Due to the health hazard posed by the carbon particulate,… (more)

▼ Soot is a carbon particulate formed as a result of the combustion of fossil fuels. Due to the health hazard posed by the carbon particulate, government agencies have applied strict regulations to control soot emissions from road vehicles, airplanes, and industrial plants. Thus, understanding soot formation and evolution is critical. Practical combustion devices operate at high pressure and in the turbulent regime. Elevated pressures and turbulence on soot formation significantly and fundamental understanding of these complex interactions is still poor. In this study, the effects of pressure and turbulence on soot formation and growth are investigated numerically. As the first step, the evolution of the particle size distribution function (PSDF) and soot particles morphology are investigated in turbulent non-premixed flames. A Direct Simulation Monte Carlo (DSMC) code is developed and used. The stochastic reactor describes the evolution of soot in fluid parcels following Lagrangian trajectories in a turbulent flow field. The trajectories are sampled from a Direct Numerical Simulation (DNS) of an n-heptane turbulent non-premixed flame. Although individual trajectories display strong bimodality as in laminar flames, the ensemble-average PSDF possesses only one mode and a broad tail, which implies significant polydispersity induced by turbulence. Secondly, the effect of the flow and mixing fields on soot formation at atmospheric and elevated pressures is investigated in coflow laminar diffusion flames. The experimental observation and the numerical prediction of the spatial distribution are in good agreement. Based on the common scaling methodology of the flames (keeping the Reynolds number constant), the scalar dissipation rate decreases as pressure increases, promoting the formation of PAH species and soot. The decrease of the scalar dissipation rate significantly contributes to soot formation occurring closer to the nozzle and outward on the flames wings as pressure increases. The scaling of the scalar dissipation rate is not straightforward due to buoyancy effects. Finally, a new scaling approach of the flame at different pressures is introduced. In this approach, both Reynolds number and Grashof number are kept constant so that the effect of gravity is the same at all pressures. In order to keep Gr constant, this requires the diameter of the nozzle to be changed as pressures vary. This approach guarantees a similar non-dimensional flow field at all pressures and rules out the effect of hydrodynamics and mixing, so that only the effect of chemical kinetics on soot formation can be studied. Advisors/Committee Members: Bisetti, Fabrizio (advisor), Roberts, William L. (committee member), Knio, Omar (committee member), Haworth, Daniel C. (committee member).

Subjects/Keywords: Soot; Monte Carlo; Diffusion flame; High pressure; scalar dissipation

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APA (6^th Edition):

Abdelgadir, A. G. (2017). Numerical Investigation of Soot Formation in Non-premixed Flames. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/625044

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):

Abdelgadir, Ahmed Gamaleldin. “Numerical Investigation of Soot Formation in Non-premixed Flames.” 2017. Thesis, King Abdullah University of Science and Technology. Accessed February 28, 2021. http://hdl.handle.net/10754/625044.

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

MLA Handbook (7^th Edition):

Abdelgadir, Ahmed Gamaleldin. “Numerical Investigation of Soot Formation in Non-premixed Flames.” 2017. Web. 28 Feb 2021.

Vancouver:

Abdelgadir AG. Numerical Investigation of Soot Formation in Non-premixed Flames. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2017. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10754/625044.

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

Council of Science Editors:

Abdelgadir AG. Numerical Investigation of Soot Formation in Non-premixed Flames. [Thesis]. King Abdullah University of Science and Technology; 2017. Available from: http://hdl.handle.net/10754/625044

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

University of Melbourne

21. Tan, Jeannie Ziang Yie. Fabrication of PVDF–TiO2 electrospun membranes incorporating with carbon nitride for solar fuel production and organic pollutant photodecomposition.

Degree: 2016, University of Melbourne

URL: http://hdl.handle.net/11343/190952

► Semiconductor–mediated photocatalysis for the decomposition of pollutants and production of industrially important species, i.e., methane by photoreduction of CO2 (g) is an emerging technology. However,… (more)

▼ Semiconductor–mediated photocatalysis for the decomposition of pollutants and production of industrially important species, i.e., methane by photoreduction of CO2 (g) is an emerging technology. However, problems, including low quantum efficiency, visible light inactivity and the difficulty to deploy and recover the photocatalyst, have to be mitigated. In order to enhance the photocatalytic activity of titanium dioxide, the sensitization of TiO2 with visible light active carbon nitrides (CNx) was proposed. Nonetheless, as an important step in the fabrication of a photocatalytic device, the integration of photocatalytic nanoparticles into a solid matrix, such as an electrospun fibrous membrane, forms a research objective in this thesis. A low temperature synthesis route to fabricate TiO2 nanoparticles with different crystal phase compositions was developed. The Ti–precursor concentration (9–45 mM) and the presence of Cl– during hydrothermal treatment influenced the TiO2 crystal phase composition. Overall, anatase–rich TiO2 samples showed higher photocatalytic decomposition activity than rutile–rich samples. However, all samples and a commercial TiO2 reference produced only trace amounts of methane during CO2 photoreduction. A polyvinylidene fluoride (PVDF)–TiO2 nanocomposite was fabricated by electrospinning followed by a low temperature hydrothermal treatment to induce the in situ growth of TiO2 nanoparticles on the electrospun PVDF nanofibres. The crystal phase composition of TiO2 was tuned by manipulating the concentration of the Ti–precursor (0.030–0.125 M) and acidity (pH <0–6.5) in the hydrothermal solution. The surface accessibility, crystal phase composition and the presence of Ti3+ within the nanocomposite significantly influenced the photocatalytic activity for CO2 reduction and organic pollutant decomposition. The maximum production of methane was 19.8 µmol per gram of photocatalyst per hour (quantum efficiency for the photomethanation reaction, Q. E.CH4 : 0.44 %) under UV irradiation. The visible light absorption of the PVDF–TiO2 nanocomposite was enhanced by the addition of CNx. A facile, low temperature wet–chemical synthesis was developed for CNx. The synthesized CNx possessed C=O functional groups that resulted in a negatively charged surface across pH 3–9, and led to an enhanced adsorption capacity and organic pollutant photodegradation under visible light irradiation. CNx also showed a relatively high capacity for heavy metal ion adsorption. Unfortunately, the CNx particles were too large for successful incorporation into the PVDF–TiO2 nanofibres. As an alternative, graphitic–CNx quantum dots (g–CNQDs) were synthesized by microwave heating, and were introduced into the PVDF–TiO2 nanofibres during electrospinning. The g–CNQDs were evenly distributed along the nanofibres, and significantly extended the photoresponse of the nanocomposite into the visible range. Methane production from CO2 photoreduction increased with the amount of g–CNQDs incorporated into the nanocomposite, with a maximum…

Subjects/Keywords: photocatalysis; TiO2; electrospinning; CO2 photoreduction; carbon nitride

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APA (6^th Edition):

Tan, J. Z. Y. (2016). Fabrication of PVDF–TiO2 electrospun membranes incorporating with carbon nitride for solar fuel production and organic pollutant photodecomposition. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/190952

Chicago Manual of Style (16^th Edition):

Tan, Jeannie Ziang Yie. “Fabrication of PVDF–TiO2 electrospun membranes incorporating with carbon nitride for solar fuel production and organic pollutant photodecomposition.” 2016. Doctoral Dissertation, University of Melbourne. Accessed February 28, 2021. http://hdl.handle.net/11343/190952.

MLA Handbook (7^th Edition):

Tan, Jeannie Ziang Yie. “Fabrication of PVDF–TiO2 electrospun membranes incorporating with carbon nitride for solar fuel production and organic pollutant photodecomposition.” 2016. Web. 28 Feb 2021.

Vancouver:

Tan JZY. Fabrication of PVDF–TiO2 electrospun membranes incorporating with carbon nitride for solar fuel production and organic pollutant photodecomposition. [Internet] [Doctoral dissertation]. University of Melbourne; 2016. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/11343/190952.

Council of Science Editors:

Tan JZY. Fabrication of PVDF–TiO2 electrospun membranes incorporating with carbon nitride for solar fuel production and organic pollutant photodecomposition. [Doctoral Dissertation]. University of Melbourne; 2016. Available from: http://hdl.handle.net/11343/190952

Universitat Rovira i Virgili

22. Gaikwad, Rohit. Carbon Dioxide To Methanol: Stoichiometric Catalytic Hydrogenation Under High Pressure Conditions.

Degree: Departament de Química Analítica i Química Orgànica, 2018, Universitat Rovira i Virgili

URL: http://hdl.handle.net/10803/586089

► Carbon dioxide concentration in the atmosphere is continuously increasing as a consequence of the combustion of fossil fuels. CO2 hydrogenation offers a unique path to… (more)

Subjects/Keywords: Hidrogenacio de CO2; sintesi de metanol; pressio alta; Hidrogenacion de CO2; sintesis de metanol; alta presion; CO2 Hydrogenation; Methanol Synthesis; High Pressure; Ciències; 54; 546; 6; 66

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APA (6^th Edition):

Gaikwad, R. (2018). Carbon Dioxide To Methanol: Stoichiometric Catalytic Hydrogenation Under High Pressure Conditions. (Thesis). Universitat Rovira i Virgili. Retrieved from http://hdl.handle.net/10803/586089

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):

Gaikwad, Rohit. “Carbon Dioxide To Methanol: Stoichiometric Catalytic Hydrogenation Under High Pressure Conditions.” 2018. Thesis, Universitat Rovira i Virgili. Accessed February 28, 2021. http://hdl.handle.net/10803/586089.

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

MLA Handbook (7^th Edition):

Gaikwad, Rohit. “Carbon Dioxide To Methanol: Stoichiometric Catalytic Hydrogenation Under High Pressure Conditions.” 2018. Web. 28 Feb 2021.

Vancouver:

Gaikwad R. Carbon Dioxide To Methanol: Stoichiometric Catalytic Hydrogenation Under High Pressure Conditions. [Internet] [Thesis]. Universitat Rovira i Virgili; 2018. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/10803/586089.

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

Council of Science Editors:

Gaikwad R. Carbon Dioxide To Methanol: Stoichiometric Catalytic Hydrogenation Under High Pressure Conditions. [Thesis]. Universitat Rovira i Virgili; 2018. Available from: http://hdl.handle.net/10803/586089

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

Iowa State University

23. Lin, Fang-Yi. Gelation mechanism, synthesis, characterization, and applications of bio-based and model thermoplastic elastomers via RAFT polymerization.

Degree: 2019, Iowa State University

URL: https://lib.dr.iastate.edu/etd/17500

► This dissertation report focuses on block copolymers derived from biomass along with a model methacrylate system to study the gelation behavior during reversible addition-fragmentation chain… (more)

▼ This dissertation report focuses on block copolymers derived from biomass along with a model methacrylate system to study the gelation behavior during reversible addition-fragmentation chain transfer (RAFT) polymerization due to the multi-functionality of bio-derived monomers. There are two bio-based block copolymer systems disclosed in this report. One is poly(styrene-blockacrylated epoxidized soybean oil) (PS-PAESO) derived from soybean oil. Thanks to the architecture of triglycerides, PS-PAESO block copolymers are found to resemble star block copolymers at low degree of polymerization (DP) and bottlebrush block copolymers at high DP. The long aliphatic chains of AESO act as the star arms in the former case while they become the side chain brushes in the latter case. At high DP, these PAESO brushes stiffen the primary chain and cause crowding. The self assembly of PS-PAESO block copolymers thus have unusual microdomain expansion without paying a severe entropy penalty. The domain spacing of the microstructures can be in the submicron scale. The investigation of PS-PAESO self assembly is conducted by small angle x-ray scattering (SAXS), transmission electron microscopy (TEM), and rheology. Understanding the structure-property relationship of PS-PAESO block copolymers reveals that the incorporation of bio-based materials in polymers has the potential for novel applications for their new structures. Another bio-based block copolymers covered in this dissertation is the glycerol-based block copolymers. Glycerol, the byproduct of biodiesel production is cheap and abundant. Developing new applications out from glycerol is therefore appealing. In this dissertation we used glycerol derivatives, acrylated glycerol and solketal acrylate to develop pressure sensitive adhesives (PSAs). Two (meth)acrylate-based block copolymers, poly(methyl methacrylate-block-acrylated glycerol) (MMAAG) and poly(isobornyl acrylate-block-solketal acrylate-block-isobornyl acrylate) (IBASA) were synthesized via RAFT polymerization. The formulation of PSAs includes only plasticizer and the elastomers without any tackifier thanks to elastomers self tack. The structureproperty relationship of these formulations was studied by rheology and peel tests. PSAs were conditioned at different humidity, adherends, and peel rates to test their peel adhesion. IBASA formulations showed comparable performance as commercial 3M ScotchTM magic tape after plasticized by benzoate esters. This result indicates that substituting petroleum-based PSAs with biobased PSAs are feasible. Since monomers of block copolymer systems revealed in this report tend to crosslink owing their multi-functional features, understanding their gelation behavior during synthesis becomes important. A model system composed of methyl methacrylate and ethylene glycol dimethacrylate was introduced to study the gelation behavior at high DP. A new parameter, the crosslinking tendency (CT) was introduced to predict the gelation conversion of controlled radical polymerization systems including RAFT…

Subjects/Keywords: bio-based polymers; gelation; pressure sensitive adhesives; RAFT polymerization; Materials Science and Engineering; Mechanics of Materials; Polymer Chemistry

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

APA (6^th Edition):

Lin, F. (2019). Gelation mechanism, synthesis, characterization, and applications of bio-based and model thermoplastic elastomers via RAFT polymerization. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17500

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):

Lin, Fang-Yi. “Gelation mechanism, synthesis, characterization, and applications of bio-based and model thermoplastic elastomers via RAFT polymerization.” 2019. Thesis, Iowa State University. Accessed February 28, 2021. https://lib.dr.iastate.edu/etd/17500.

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

MLA Handbook (7^th Edition):

Lin, Fang-Yi. “Gelation mechanism, synthesis, characterization, and applications of bio-based and model thermoplastic elastomers via RAFT polymerization.” 2019. Web. 28 Feb 2021.

Vancouver:

Lin F. Gelation mechanism, synthesis, characterization, and applications of bio-based and model thermoplastic elastomers via RAFT polymerization. [Internet] [Thesis]. Iowa State University; 2019. [cited 2021 Feb 28]. Available from: https://lib.dr.iastate.edu/etd/17500.

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

Council of Science Editors:

Lin F. Gelation mechanism, synthesis, characterization, and applications of bio-based and model thermoplastic elastomers via RAFT polymerization. [Thesis]. Iowa State University; 2019. Available from: https://lib.dr.iastate.edu/etd/17500

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

24. Virant, Natalija. RAZVOJ HPLC ANALIZNE METODE ZA DOLOČANJE SPROŠČANJA ZDRAVILNIH UČINKOVIN IZ MEDICINSKIH OBLOG OB SOČASNEM UPOŠTEVANJU EROZIJE NOSILNEGA MATERIALA.

Degree: 2015, Univerza v Mariboru

URL: https://dk.um.si/IzpisGradiva.php?id=54920 ; https://dk.um.si/Dokument.php?id=82096&dn= ; https://plus.si.cobiss.net/opac7/bib/19035670?lang=sl

►

Namen magistrskega dela je bil razviti in validirati HPLC analizno metodo za določanje sproščanja benzokaina iz nanovlaken. V ta namen smo pripravili elektropredena nanovlakna z… (more)

▼

Namen magistrskega dela je bil razviti in validirati HPLC analizno metodo za določanje sproščanja benzokaina iz nanovlaken. V ta namen smo pripravili elektropredena nanovlakna z benzokainom in optimizirali postopek elektropredenja iz celuloznega acetata (CA). Pri tem smo preučevali vpliv procesnih parametrov in parametrov predilne raztopine na potek elektropredenja. Dobljena nanovlakna smo okarakterizirali s SEM in FTIR analizo, določili smo tudi stopnjo nabrekanja in stični kot. Koncentracije benzokaina smo določali z uporabo kolone Supelcosil LC-18 (20 cm x 4,6 cm, 3µm) in UV-VIS detektorja pri valovni dolžini 285 nm. Kot optimalno mobilno fazo smo izbrali acetonitril:voda (60:40) pri pretoku 0,8 ml/min. Pri teh pogojih se je benzokain eluiral pri 4,26 min. Določili smo, da je razvita metoda natančna, točna in linearna v območju med 5 in 50 mg/l. Meja zaznavnosti (LOD) znaša 1,08 mg/l, meja določljivosti (LOQ) pa 3,27 mg/l. Gladka nanovlakna, s premerom med 400 in 900 nm, smo izpredli iz 17 ut. % CA v 85 % ocetni kislini. Optimalni procesni parametri elektropredenja so: napetost 75 kV in razdalja med elektrodama 160 mm. Optimalni predilni raztopini smo dodali 5 % benzokaina (glede na maso CA) in ta dodatek ni vplival na postopek elektropredenja.

The aim of the master thesis was developed and validated HPLC analysis method for determination of benzocaine release from nanofibers. For this purpose we have prepared electrospun nanofibers with benzocaine and optimized electrospinning process of cellulose acetate (CA). We have studied the influence of solution parameters and process parameters of electrospinning. Electrospun nanofibers were characterized by SEM and FTIR analysis. Swelling behaviors and contact angle were also investigated. Concentrations of benzocaine were determined using Supelcosil LC-18 (20 cm x 4,6 cm, 3µm) column. The UV-VIS detector was set at 285 nm. The mobile phase consisted of acetonitrile:water (60:40) and used flow rate was 0,8 ml/min. Under these conditions benzocaine eluted at 4,26 min. We confirmed that method was precise, accurate and linear from 5 to 50 mg/l. The limits of detection (LOD) and quantification (LOQ) values were 1,08 mg/l and 3,27 mg/l, respectively. Smooth nanofibers with diameters ranging from 400 to 900 nm were electrospun from a 17 ut. % CA solution in 85 % acetic acid. Optimal electrospinning parameters are 160 mm distance between electrodes and 75 kV voltage. The addition of 5 % benzocaine (based on the weight of CA) in the spinning formulation did not affect the fiber formation.

Advisors/Committee Members: Kolar, Mitja.

Subjects/Keywords: tekočinska kromatografija visoke ločljivosti (HPLC); validacija; elektropredenje; benzokain; kinetika sproščanja; high performance liquid chromatography (HPLC); validation; electrospinning; benzocaine; drug release kinetics; info:eu-repo/classification/udc/543.544.5(043.2)

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

APA (6^th Edition):

Virant, N. (2015). RAZVOJ HPLC ANALIZNE METODE ZA DOLOČANJE SPROŠČANJA ZDRAVILNIH UČINKOVIN IZ MEDICINSKIH OBLOG OB SOČASNEM UPOŠTEVANJU EROZIJE NOSILNEGA MATERIALA. (Masters Thesis). Univerza v Mariboru. Retrieved from https://dk.um.si/IzpisGradiva.php?id=54920 ; https://dk.um.si/Dokument.php?id=82096&dn= ; https://plus.si.cobiss.net/opac7/bib/19035670?lang=sl

Chicago Manual of Style (16^th Edition):

Virant, Natalija. “RAZVOJ HPLC ANALIZNE METODE ZA DOLOČANJE SPROŠČANJA ZDRAVILNIH UČINKOVIN IZ MEDICINSKIH OBLOG OB SOČASNEM UPOŠTEVANJU EROZIJE NOSILNEGA MATERIALA.” 2015. Masters Thesis, Univerza v Mariboru. Accessed February 28, 2021. https://dk.um.si/IzpisGradiva.php?id=54920 ; https://dk.um.si/Dokument.php?id=82096&dn= ; https://plus.si.cobiss.net/opac7/bib/19035670?lang=sl.

MLA Handbook (7^th Edition):

Virant, Natalija. “RAZVOJ HPLC ANALIZNE METODE ZA DOLOČANJE SPROŠČANJA ZDRAVILNIH UČINKOVIN IZ MEDICINSKIH OBLOG OB SOČASNEM UPOŠTEVANJU EROZIJE NOSILNEGA MATERIALA.” 2015. Web. 28 Feb 2021.

Vancouver:

Virant N. RAZVOJ HPLC ANALIZNE METODE ZA DOLOČANJE SPROŠČANJA ZDRAVILNIH UČINKOVIN IZ MEDICINSKIH OBLOG OB SOČASNEM UPOŠTEVANJU EROZIJE NOSILNEGA MATERIALA. [Internet] [Masters thesis]. Univerza v Mariboru; 2015. [cited 2021 Feb 28]. Available from: https://dk.um.si/IzpisGradiva.php?id=54920 ; https://dk.um.si/Dokument.php?id=82096&dn= ; https://plus.si.cobiss.net/opac7/bib/19035670?lang=sl.

Council of Science Editors:

Virant N. RAZVOJ HPLC ANALIZNE METODE ZA DOLOČANJE SPROŠČANJA ZDRAVILNIH UČINKOVIN IZ MEDICINSKIH OBLOG OB SOČASNEM UPOŠTEVANJU EROZIJE NOSILNEGA MATERIALA. [Masters Thesis]. Univerza v Mariboru; 2015. Available from: https://dk.um.si/IzpisGradiva.php?id=54920 ; https://dk.um.si/Dokument.php?id=82096&dn= ; https://plus.si.cobiss.net/opac7/bib/19035670?lang=sl

Loughborough University

25. Hughes, Foz. The high strain-rate behaviour of polymers and nanocomposites for lightweight armour applications.

Degree: PhD, 2013, Loughborough University

URL: http://hdl.handle.net/2134/13705

► The need for efficient, lightweight armour solutions has never been so great as it is today. Increasing numbers of personnel, both military and civilian are… (more)

Subjects/Keywords: 620.1; SHPB; Split Hopkinson Pressure Bar; Optical dropweight; High strain rate; Polymers; Nanocomposites

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

APA (6^th Edition):

Hughes, F. (2013). The high strain-rate behaviour of polymers and nanocomposites for lightweight armour applications. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/13705

Chicago Manual of Style (16^th Edition):

Hughes, Foz. “The high strain-rate behaviour of polymers and nanocomposites for lightweight armour applications.” 2013. Doctoral Dissertation, Loughborough University. Accessed February 28, 2021. http://hdl.handle.net/2134/13705.

MLA Handbook (7^th Edition):

Hughes, Foz. “The high strain-rate behaviour of polymers and nanocomposites for lightweight armour applications.” 2013. Web. 28 Feb 2021.

Vancouver:

Hughes F. The high strain-rate behaviour of polymers and nanocomposites for lightweight armour applications. [Internet] [Doctoral dissertation]. Loughborough University; 2013. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/2134/13705.

Council of Science Editors:

Hughes F. The high strain-rate behaviour of polymers and nanocomposites for lightweight armour applications. [Doctoral Dissertation]. Loughborough University; 2013. Available from: http://hdl.handle.net/2134/13705

University of Windsor

26. Khoubesserian, Ludwig G. Thermodynamic studies of polymers under high pressure.

Degree: MA, Chemical Engineering, 1965, University of Windsor

URL: https://scholar.uwindsor.ca/etd/6430

Subjects/Keywords: HIGH; POLYMERS; PRESSURE; STUDIES; THERMODYNAMIC; UNDER

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

APA (6^th Edition):

Khoubesserian, L. G. (1965). Thermodynamic studies of polymers under high pressure. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6430

Chicago Manual of Style (16^th Edition):

Khoubesserian, Ludwig G. “Thermodynamic studies of polymers under high pressure.” 1965. Masters Thesis, University of Windsor. Accessed February 28, 2021. https://scholar.uwindsor.ca/etd/6430.

MLA Handbook (7^th Edition):

Khoubesserian, Ludwig G. “Thermodynamic studies of polymers under high pressure.” 1965. Web. 28 Feb 2021.

Vancouver:

Khoubesserian LG. Thermodynamic studies of polymers under high pressure. [Internet] [Masters thesis]. University of Windsor; 1965. [cited 2021 Feb 28]. Available from: https://scholar.uwindsor.ca/etd/6430.

Council of Science Editors:

Khoubesserian LG. Thermodynamic studies of polymers under high pressure. [Masters Thesis]. University of Windsor; 1965. Available from: https://scholar.uwindsor.ca/etd/6430

North Carolina State University

27. McCrain, Laura L. The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame.

Degree: MS, Aerospace Engineering, 2003, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/504

► Soot volume fraction (f[subscript sv]) is measured quantitatively in a laminar diffusion flame at elevated pressures up to 25 atmospheres as a function of fuel… (more)

Subjects/Keywords: diffusion flame; high pressure; soot formation

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APA (6^th Edition):

McCrain, L. L. (2003). The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/504

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):

McCrain, Laura L. “The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame.” 2003. Thesis, North Carolina State University. Accessed February 28, 2021. http://www.lib.ncsu.edu/resolver/1840.16/504.

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

MLA Handbook (7^th Edition):

McCrain, Laura L. “The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame.” 2003. Web. 28 Feb 2021.

Vancouver:

McCrain LL. The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame. [Internet] [Thesis]. North Carolina State University; 2003. [cited 2021 Feb 28]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/504.

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

Council of Science Editors:

McCrain LL. The Effect of Elevated Pressure on Soot Formation in a Laminar Jet Diffusion Flame. [Thesis]. North Carolina State University; 2003. Available from: http://www.lib.ncsu.edu/resolver/1840.16/504

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

28. Marion, Jérémie. Etude de la dynamique biomoléculaire sous haute pression par diffusion neutronique : Study of biomolecular dynamics under high pressure by neutron scattering.

Degree: Docteur es, Physique pour les sciences du vivant, 2015, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2015GREAY091

►

La poursuite de nouveaux angles de recherche est depuis toujours l'un des facteurs clés du progrès scientifique. Au travers de ce travail, nous amenons de… (more)

▼

La poursuite de nouveaux angles de recherche est depuis toujours l'un des facteurs clés du progrès scientifique. Au travers de ce travail, nous amenons de nouveaux éléments permettant d'ouvrir une discussion sur la dynamique moléculaire et la structure des biomolécules, étudiées par diffusion neutronique sous haute pression. Le projet d'étude s'axe sur différents sujets ayant pour dénominateur commun la haute pression en biologie, fil conducteur de ces recherches. L'intérêt de la haute pression en biologie n'est pas a priori évident ; pourtant, un grand nombre de points stimulent ce champ d'investigation. Une partie conséquente de la biosphère subit un environnement sous haute pression : les organismes barophiles des grands fonds marins subissent des conditions de stress uniques, qui soulèvent des questions sur l'adaptation biologique. D'autre part, la haute pression trouve un intérêt concret dans l'agro-alimentaire pour la conservation alimentaire ou, nouvellement, la fabrication de vaccins. Cependant, ces recherches se situent en aval des travaux qui nous intéressent dans cet ouvrage. La thèse présentée donne une vision plus théorique, ou phénoménologique, de processus tels que des états métastables protéiques, leur dénaturation, ou encore l'étude de la transition dynamique, aux travers d'expériences adaptées au besoin du sujet entrepris. Un tel travail ne permet pas de couvrir toutes les informations nécessaires pour aborder une vision globale du sujet. L'ouvrage se concentre donc sur l'étude par diffusion neutronique des effets de la pression en biophysique pour élaborer de nouvelles possibilités de recherches, qui seront discutées ici.

Seeking new research options have always been the heart of scientific progress. Through this work, new elements are brought to start a discussion about molecular dynamics and biomolecule structure studied through high pressure experiments with neutron scattering. The project explores different subjects all gathered around the high pressure guideline. High pressure interest in biology might seem quite opaque: however, a large amount of points justifies this investigation field. A large part of the biosphere undergoes high pressure stress due to the fact of its presence in the deep sea, raising question about biological adaptation to high pressure environment, for example. High pressure in the last decades has raised interest on other purposes like food conservation or vaccine fabrication. These research fields are on the final stage of the steps studied in this work, that starts its origin through more theoretical and phenomenological events. The manuscript covers different areas such as dynamical transition or metastable state and denaturation of proteins through experiments designed to the need of the research. Such a field requires a gigantic amount of investigation while restraining the possibilities of generalization. Thus, the work is focused on neutron scattering as a probe for high pressure studies in biophysics in order to elaborate new research clues in the field dealt…

Advisors/Committee Members: Peters, Judith (thesis director).

Subjects/Keywords: Dynamique; Biomolécules; Haute pression; Diffusion neutronique; Dynamics; Biomolecules; High pressure; Neutron scattering; 530; 570

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

APA (6^th Edition):

Marion, J. (2015). Etude de la dynamique biomoléculaire sous haute pression par diffusion neutronique : Study of biomolecular dynamics under high pressure by neutron scattering. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2015GREAY091

Chicago Manual of Style (16^th Edition):

Marion, Jérémie. “Etude de la dynamique biomoléculaire sous haute pression par diffusion neutronique : Study of biomolecular dynamics under high pressure by neutron scattering.” 2015. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed February 28, 2021. http://www.theses.fr/2015GREAY091.

MLA Handbook (7^th Edition):

Marion, Jérémie. “Etude de la dynamique biomoléculaire sous haute pression par diffusion neutronique : Study of biomolecular dynamics under high pressure by neutron scattering.” 2015. Web. 28 Feb 2021.

Vancouver:

Marion J. Etude de la dynamique biomoléculaire sous haute pression par diffusion neutronique : Study of biomolecular dynamics under high pressure by neutron scattering. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2015. [cited 2021 Feb 28]. Available from: http://www.theses.fr/2015GREAY091.

Council of Science Editors:

Marion J. Etude de la dynamique biomoléculaire sous haute pression par diffusion neutronique : Study of biomolecular dynamics under high pressure by neutron scattering. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2015. Available from: http://www.theses.fr/2015GREAY091

University of Delaware

29. Liu, Wenwen. Preparation and characterization of multi-layer biodegradable nanofibers by coaxial electrospinning and their potential for tissue engineering.

Degree: PhD, University of Delaware, Department of Materials Science and Engineering, 2015, University of Delaware

URL: http://udspace.udel.edu/handle/19716/17523

► As an evolution of conventional electrospinning, coaxial electrospinning became popular soon after its debut as a novel way to develop nanofibers with special structures, such… (more)

▼ As an evolution of conventional electrospinning, coaxial electrospinning became popular soon after its debut as a novel way to develop nanofibers with special structures, such as core-shell and hollow interior. In recent years, there has been an increasing interest in a modified coaxial electrospinning, tri-layer coaxial electrospinning, to develop more complex structures, such as multi-layer and nanowire-in-microtube. Previous studies have primarily concentrated on the fabrication of tri-layered inorganic fibers while studies on tri-layered coaxial polymeric fibers has not been reported until very recently. Our research focuses on the fabrication of core-shell and tri-layer structured biodegradable polymeric nanofibers with coaxial electrospinning. Different characterization methods have been applied to observe the internal structure in single nanofibers and the potential application of tri-layer coaxial electrospinning has been discussed. The material system consists of biodegradable natural polymer gelatin, synthetic polymers poly (ε-caprolactone) (PCL) and poly (lactic-co-glycolic acid) (PLGA). A uniquely designed three-needle concentric spinneret is developed to perform tri-layer coaxial electrospinning. Different kinds of core-shell structured nanofibers, including gelatin/PCL, PCL/gelatin, gelatin/PLGA and PCL/PLGA, have been fabricated with a customized coaxial electrospinning apparatus. Two kinds of tri-layer coaxial nanofibers, two-component ABA structured gelatin/PCL/gelatin biodegradable nanofibers and tri-component ABC structured gelatin/PCL/PLGA biodegradable nanofibers, have been developed with the customized three needle coaxial electrospinning setup. The core-shell and tri-layered structures of electrospun nanofibers have been characterized by several commonly used techniques, such as laser scanning confocal microscopy (LSCM) and transmission electron microscopy (TEM). Besides the conventional methods, other newer techniques, including focused ion beam-scanning electron microscopy (FIB-SEM), super-resolution structured illumination microscopy (SR-SIM) and nanoscale-infrared spectroscopy (nano-IR), have been explored to investigate the internal structure in singles fibers. Additionally, the potential application of coaxial electrospinning in the fabrication of bioactive scaffolds for tissue engineering has been studied. Different kinds of coaxial nanofibers were fabricated and studied to determine the potential for BSA and growth factor release and some preliminary results were obtained. Advisors/Committee Members: Rabolt, John F.Chase, D. Bruce.

Subjects/Keywords: Nanofibers.; Electrospinning.; Microscopy.; Infrared spectroscopy.; Polymers.; Gelatin.

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APA (6^th Edition):

Liu, W. (2015). Preparation and characterization of multi-layer biodegradable nanofibers by coaxial electrospinning and their potential for tissue engineering. (Doctoral Dissertation). University of Delaware. Retrieved from http://udspace.udel.edu/handle/19716/17523

Chicago Manual of Style (16^th Edition):

Liu, Wenwen. “Preparation and characterization of multi-layer biodegradable nanofibers by coaxial electrospinning and their potential for tissue engineering.” 2015. Doctoral Dissertation, University of Delaware. Accessed February 28, 2021. http://udspace.udel.edu/handle/19716/17523.

MLA Handbook (7^th Edition):

Liu, Wenwen. “Preparation and characterization of multi-layer biodegradable nanofibers by coaxial electrospinning and their potential for tissue engineering.” 2015. Web. 28 Feb 2021.

Vancouver:

Liu W. Preparation and characterization of multi-layer biodegradable nanofibers by coaxial electrospinning and their potential for tissue engineering. [Internet] [Doctoral dissertation]. University of Delaware; 2015. [cited 2021 Feb 28]. Available from: http://udspace.udel.edu/handle/19716/17523.

Council of Science Editors:

Liu W. Preparation and characterization of multi-layer biodegradable nanofibers by coaxial electrospinning and their potential for tissue engineering. [Doctoral Dissertation]. University of Delaware; 2015. Available from: http://udspace.udel.edu/handle/19716/17523

Queen Mary, University of London

30. Yao, Jian. High strength and high modulus electrospun nanofibres.

Degree: PhD, 2014, Queen Mary, University of London

URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/13119 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667387

► In the last two decades, a rapidly growing polymer processing technology, electrospinning, has attracted great interests as it provides a viable and simple method to… (more)

▼ In the last two decades, a rapidly growing polymer processing technology, electrospinning, has attracted great interests as it provides a viable and simple method to create ultra-fine continuous fibres. Despite the potential utilization of electrospun nanofibres in many fields, their success is limited so far due to their poor mechanical properties compared to corresponding textile fibres made from the same polymers, which is mainly ascribed to the low degree of orientation and chain extension of the macromolecules along the fibre axis in such fibres. In this thesis, first an in-depth review of the mechanical properties of electrospun fibres and recent developed methodologies to generate high strength and high modulus nanofibres will be presented. In the experimental work, electrospinning of rigid polymer PPTA was attempted and mechanical properties of obtained fibres were evaluated (Chapter 3). It was shown that the electrospinning process cannot be easily operated in a controllable and continuous manner although some high performance fibres were obtained. Chapter 4 dealt with the electrospinning of reactive mesogens (liquid crystal monomers) by employing polymers (PMMA and PA6) as matrix. The mechanical properties of the resulting composite nanofibres (PA6/RM257) showed dependence on the reactive mesogen (RM257) content and the phase separation between PA6 and RM257. In Chapter 5, a high performance polymer BPDA/PDA/ODA was synthesized and electrospun; the nanofibres were characterized using FTIR and WAXD and their mechanical tests were carried out based on unidirectional mats and multifilament bundles. A Weibull modulus based model was introduced to estimate the tensile strength of single nanofibres in such bundles. Subsequently, composites based on BPO nanofibres in a rubbery thermoplastic matrix were fabricated and evaluated in Chapter 7 using composite mechanics theories for off-axis properties and „Rule of Mixture‟ which were used to back-calculate the Young‟s modulus of single BPO nanofibres. From this it could be concluded that the developed co-polyimide BPO nanofibres exhibit among the highest mechanical properties of electrospun nanofibres reported in literature so far. It can be concluded that the electrospun BPO co-polyimide nanofibres and p-aramid fibres possess among the highest mechanical properties reported for electrospun fibres so far.

Subjects/Keywords: 620.1; Materials Science; Nanofibres; Electrospinning; Polymers

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APA (6^th Edition):

Yao, J. (2014). High strength and high modulus electrospun nanofibres. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/13119 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667387

Chicago Manual of Style (16^th Edition):

Yao, Jian. “High strength and high modulus electrospun nanofibres.” 2014. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021. http://qmro.qmul.ac.uk/xmlui/handle/123456789/13119 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667387.

MLA Handbook (7^th Edition):

Yao, Jian. “High strength and high modulus electrospun nanofibres.” 2014. Web. 28 Feb 2021.

Vancouver:

Yao J. High strength and high modulus electrospun nanofibres. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2014. [cited 2021 Feb 28]. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/13119 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667387.

Council of Science Editors:

Yao J. High strength and high modulus electrospun nanofibres. [Doctoral Dissertation]. Queen Mary, University of London; 2014. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/13119 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667387

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