subject:(Membrane Science)

University of Maine

1. Kennard, Raymond Russell. Characterization of Mesoporous Materials Via Fluorescent Spectroscopic Methods.

Degree: PhD, Chemical Engineering, 2011, University of Maine

URL: https://digitalcommons.library.umaine.edu/etd/1745

► There are three components that need to be understood to create new porous membranes for industrial applications. 1.) To understand appropriate synthesis conditions to… (more)

Subjects/Keywords: membrane technology; Membrane Science

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APA (6^th Edition):

Kennard, R. R. (2011). Characterization of Mesoporous Materials Via Fluorescent Spectroscopic Methods. (Doctoral Dissertation). University of Maine. Retrieved from https://digitalcommons.library.umaine.edu/etd/1745

Chicago Manual of Style (16^th Edition):

Kennard, Raymond Russell. “Characterization of Mesoporous Materials Via Fluorescent Spectroscopic Methods.” 2011. Doctoral Dissertation, University of Maine. Accessed January 18, 2021. https://digitalcommons.library.umaine.edu/etd/1745.

MLA Handbook (7^th Edition):

Kennard, Raymond Russell. “Characterization of Mesoporous Materials Via Fluorescent Spectroscopic Methods.” 2011. Web. 18 Jan 2021.

Vancouver:

Kennard RR. Characterization of Mesoporous Materials Via Fluorescent Spectroscopic Methods. [Internet] [Doctoral dissertation]. University of Maine; 2011. [cited 2021 Jan 18]. Available from: https://digitalcommons.library.umaine.edu/etd/1745.

Council of Science Editors:

Kennard RR. Characterization of Mesoporous Materials Via Fluorescent Spectroscopic Methods. [Doctoral Dissertation]. University of Maine; 2011. Available from: https://digitalcommons.library.umaine.edu/etd/1745

McMaster University

2. Pan, Si. Analytical and Biomedical Applications of Porous Membranes.

Degree: MASc, 2013, McMaster University

URL: http://hdl.handle.net/11375/12819

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Membrane filtration is widely used to biomedical and analytical applications. Compared to other techniques available membrane filtration provides fast processing time, easy availability, robust… (more)

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Membrane filtration is widely used to biomedical and analytical applications. Compared to other techniques available membrane filtration provides fast processing time, easy availability, robust performance and relatively low cost. These advantages make ultrafiltration and microfiltration well integrated into bioseparation, purification of biomedical materials and downstream polishing. Apart from the advatanges, there are certain drawbacks with microfiltration and ultrafiltration. While perceived negative in many scenarios, the effects does not necessarily counteract the purpose of the process and could find some useful applications if treated from a different perspective. By the virtue of fast processing of membrane filtrations, applications were made in processing biomedical materials and developing analytical methods. Poly(N-isopropylacrylamide) microgels are of potential in many biomedical applications. Microfiltration and ultrafiltration of such microgels for fast purification were explored. Meanwhile, the environmental responsive behaviours of such microgels bring about opportunity and challenge. Investigations were made on the salt-responsive transmission behaviours of microgels in microfiltrations. A hypothesis was raised and verified. Implications of applications in vivo were drawn based on experimental results. Many techniques for analysis of protein-drug binding have been under development. A new alternative utilizing pulsed tangential flow ultrafiltration was developed in this study and used to obtain binding data between aspirin and BSA under different conditions. The performance of the systems was assessed under different parameter settings. Possibility of further automation was discussed. On account of the fouling and concentration polarization, a new perspective was taken with the effort of developing such effects into potential applications. Patterned fouling was introduced and the fouled membrane was used to filter coloured feed to reveal the patterns transferred. Concentration polarization in ultrafiltrations with different levels of fixation of membranes was visualized by dyed particles. The possible flow modes under these conditions were suggested. A hypothesis was attempted from a fluidics point of view.

Master of Applied Science (MASc)

Advisors/Committee Members: Ghosh, R., Chemical Engineering.

Subjects/Keywords: Membrane; microgel; analytical; pattern; Membrane Science; Membrane Science

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APA (6^th Edition):

Pan, S. (2013). Analytical and Biomedical Applications of Porous Membranes. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/12819

Chicago Manual of Style (16^th Edition):

Pan, Si. “Analytical and Biomedical Applications of Porous Membranes.” 2013. Masters Thesis, McMaster University. Accessed January 18, 2021. http://hdl.handle.net/11375/12819.

MLA Handbook (7^th Edition):

Pan, Si. “Analytical and Biomedical Applications of Porous Membranes.” 2013. Web. 18 Jan 2021.

Vancouver:

Pan S. Analytical and Biomedical Applications of Porous Membranes. [Internet] [Masters thesis]. McMaster University; 2013. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11375/12819.

Council of Science Editors:

Pan S. Analytical and Biomedical Applications of Porous Membranes. [Masters Thesis]. McMaster University; 2013. Available from: http://hdl.handle.net/11375/12819

McMaster University

3. Wang, Luying. Molecular Dynamics Simulations of Liquid Transport through Nanofiltration Membranes.

Degree: PhD, 2012, McMaster University

URL: http://hdl.handle.net/11375/12488

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Nanofiltration (NF) is a pressure-driven membrane separation process, which is a nonequilibrium process because of the pressure difference and concentration difference across the membrane.… (more)

Subjects/Keywords: Molecular dynamics; Nanofiltration; Transport; Membrane; Membrane Science; Transport Phenomena; Membrane Science

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APA (6^th Edition):

Wang, L. (2012). Molecular Dynamics Simulations of Liquid Transport through Nanofiltration Membranes. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/12488

Chicago Manual of Style (16^th Edition):

Wang, Luying. “Molecular Dynamics Simulations of Liquid Transport through Nanofiltration Membranes.” 2012. Doctoral Dissertation, McMaster University. Accessed January 18, 2021. http://hdl.handle.net/11375/12488.

MLA Handbook (7^th Edition):

Wang, Luying. “Molecular Dynamics Simulations of Liquid Transport through Nanofiltration Membranes.” 2012. Web. 18 Jan 2021.

Vancouver:

Wang L. Molecular Dynamics Simulations of Liquid Transport through Nanofiltration Membranes. [Internet] [Doctoral dissertation]. McMaster University; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11375/12488.

Council of Science Editors:

Wang L. Molecular Dynamics Simulations of Liquid Transport through Nanofiltration Membranes. [Doctoral Dissertation]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/12488

University of Arkansas

4. Mahmoudi, Neda. Design of Peptoid-Based Coating to Reduce Biofouling in Gas Exchange Devices.

Degree: PhD, 2018, University of Arkansas

URL: https://scholarworks.uark.edu/etd/2904

► In recent decades, membrane technology has been used commonly in biomedical area. However, membrane fouling is a widespread problem in different applications. One method… (more)

▼ In recent decades, membrane technology has been used commonly in biomedical area. However, membrane fouling is a widespread problem in different applications. One method to minimize fouling is through surface modification of membranes. My research explores a novel polymer to minimize nonspecific protein adsorption in biomedical applications. It firstly focuses on grafting the electrically neutral NMEG peptoid, containing 2-methoxyethyl side chains, to polysulfone (PSU) membrane via polydopamine. Contact angle measurements indicated that the hydrophilicity of the peptoid-grafted membranes was significantly improved while the pore size and strength of the membranes remained unchanged. The modified membranes showed an improved fouling resistance when tested with bovine serum albumin, lysozyme and fibrinogen proteins. To further investigate the low fouling surfaces, peptoid length was varied length of peptoids (NMEG5, NMEG10, NMEG15 and NMEG20). The effect of peptoid length and grafting density on fouling resistance of the membranes was studied. Static adsorption experiments with bovine serum albumin revealed that there is an optimal grafting density to improve fouling resistance of peptoid modified membranes, which was dependent on the length and amount of the grafted peptoids. To evaluate the application of modified hollow fibers in the biomedical field, a gas exchange system was designed and built. The peptoid-grafted hollow fiber membranes could preserve an excellent oxygen gas transmission compared with PSU membranes after exposure to bovine serum solution (35 mg/ml in PBS). To expand the understanding about dynamic fouling resistance of peptoid grafted surfaces, cross-flow filtration tests using bovine serum solution as the feed, was designed and built. According to the cross-flow filtration results, NMEG modified membranes showed a significant improvement in antifouling ability. Furthermore, flux recovery ratios obtained from NMEG modified membranes were much higher than unmodified membranes. The outcome of this study suggests that peptoids are a promising material for fouling-resistant membrane surface modification Advisors/Committee Members: Shannon Servoss, Robert Beitle, Lauren Greenlee.

Subjects/Keywords: Chemical Engineering; Membrane Science

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APA (6^th Edition):

Mahmoudi, N. (2018). Design of Peptoid-Based Coating to Reduce Biofouling in Gas Exchange Devices. (Doctoral Dissertation). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2904

Chicago Manual of Style (16^th Edition):

Mahmoudi, Neda. “Design of Peptoid-Based Coating to Reduce Biofouling in Gas Exchange Devices.” 2018. Doctoral Dissertation, University of Arkansas. Accessed January 18, 2021. https://scholarworks.uark.edu/etd/2904.

MLA Handbook (7^th Edition):

Mahmoudi, Neda. “Design of Peptoid-Based Coating to Reduce Biofouling in Gas Exchange Devices.” 2018. Web. 18 Jan 2021.

Vancouver:

Mahmoudi N. Design of Peptoid-Based Coating to Reduce Biofouling in Gas Exchange Devices. [Internet] [Doctoral dissertation]. University of Arkansas; 2018. [cited 2021 Jan 18]. Available from: https://scholarworks.uark.edu/etd/2904.

Council of Science Editors:

Mahmoudi N. Design of Peptoid-Based Coating to Reduce Biofouling in Gas Exchange Devices. [Doctoral Dissertation]. University of Arkansas; 2018. Available from: https://scholarworks.uark.edu/etd/2904

University of Kentucky

5. Islam, Mohammad Saiful. MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION.

Degree: 2020, University of Kentucky

URL: https://uknowledge.uky.edu/cme_etds/121

► Microfiltration polyvinylidene fluoride (PVDF) membranes have distinct advantage for open structure in terms of high internal surface area and ease of access in the pore… (more)

▼ Microfiltration polyvinylidene fluoride (PVDF) membranes have distinct advantage for open structure in terms of high internal surface area and ease of access in the pore domain. Functionalization of PVDF membranes with different functional groups (-COOH, -OH, -SH) enables responsive (pH, temperature) properties to membrane, tuning of effective pore size, controlling permeate flux. PVDF microfiltration membrane functionalization with suitable responsive polymer such as poly acrylic acid (PAA) to incorporate carboxyl (-COOH) group enables further modification of functionalized PAA-PVDF membranes for different application ranging from catalysis, bio reactor to heavy metal sorption platform. As a catalytic reactor bed, this PAA-PVDF membranes are very desirable platform for in-situ synthesis of catalytic nanoparticles for conducting a wide range of reactions. As a bio reactor, PAA-PVDF membrane with a net charge have been used to electrostatically immobilize enzymes for conducting catalytic reactions. Functionalization of PVDF membrane also allow for the development of high capacity heavy metal sorbents by modifying existing functional groups (-COOH) to other functional groups (-SH) to adsorb heavy metal cations from contaminated water. Hydrophilic polymers with carboxylic (-COOH) groups are studied in different functionalization processes especially in preparation of responsive (pH) membranes. To understand the role of membrane pore polymerization condition on the properties of functionalized membrane a systematic study has been conducted, specifically, the effects of polymerization on the membrane mass gain, water permeability, Pd-Fe nanoparticle (NP) loading, of pore functionalized polyvinylidene fluoride (PVDF) membranes. In this study, monomer (acrylic acid (AA)) and cross-linker (N, N′- methylene-bis (acrylamide)) concentrations were varied from 10 to 20 wt% of polymer solution and 0.5-2 mol% of monomer concentration, respectively. Results showed that responsive behavior of membrane could be tuned in terms of water permeability over a range of 270-1 Lm-2 h-1 bar-1, which is a function of water pH. The NP size on the membrane surface was found in the range of 16-23 nm. NP loading was found to vary from 0.21 to 0.94 mg per cm2 of membrane area depending on the variation of available carboxyl groups in membrane pore domain. The NPs functionalized membranes were then tested as a platform for the degradation of 3,3',4,4',5-pentachlorobiphenyl (PCB 126) and understand the effect of NP loading of the rate of degradation of PCB 126. The observed batch reaction rate (Kobs) for PCB 126 degradation for per mg of catalyst loading was found 0.08-0.1 h-1. Degradation study in convective flow mode shows 98.6% PCB 126 is degraded at a residence time of 46.2 s. The corresponding surface area normalized reaction rate (Ksa) is found about two times higher than Ksa of batch degradation; suggesting elimination of the effect of diffusion resistance for degradation of PCB 126 in convective flow mode operation. A layer-by-layer approach…

Subjects/Keywords: Microfiltration PVDF Membrane; Nanoparticles; Catalytic Membrane Reactor; Enzyme Immobilized Membrane; Thiol Functionalized Membrane; Hollow Nanoparticles; Membrane Science

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APA (6^th Edition):

Islam, M. S. (2020). MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cme_etds/121

Chicago Manual of Style (16^th Edition):

Islam, Mohammad Saiful. “MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION.” 2020. Doctoral Dissertation, University of Kentucky. Accessed January 18, 2021. https://uknowledge.uky.edu/cme_etds/121.

MLA Handbook (7^th Edition):

Islam, Mohammad Saiful. “MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION.” 2020. Web. 18 Jan 2021.

Vancouver:

Islam MS. MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION. [Internet] [Doctoral dissertation]. University of Kentucky; 2020. [cited 2021 Jan 18]. Available from: https://uknowledge.uky.edu/cme_etds/121.

Council of Science Editors:

Islam MS. MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION. [Doctoral Dissertation]. University of Kentucky; 2020. Available from: https://uknowledge.uky.edu/cme_etds/121

McMaster University

6. Lu, Hongyu. Interfacial Synthesis of Metal-organic Frameworks.

Degree: MSc, 2012, McMaster University

URL: http://hdl.handle.net/11375/12288

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Metal-organic frameworks (MOFs) are considered as a type of very useful materials for the gas separation/purification industries. However, control over the growing position and… (more)

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Metal-organic frameworks (MOFs) are considered as a type of very useful materials for the gas separation/purification industries. However, control over the growing position and growing shape of the crystals remains a challenge and must be overcome in order to realize the commercial potentials of MOFs. In this thesis, a method based on interfacial coordination is developed to address this issue. Zinc-benzenedicarboxyl (Zn-BDC) is chosen as a model system for the proof of concept. In a typical liquid-liquid interface protocol, the MOF precursors, zinc nitrate [Zn(NO3)2] and terephthalic acid (TPA or H2BDC), and the catalyst, triethylamine (TEA), were dissolved into two immiscible solvents, dimethylformamide (DMF) and hexane, respectively. The reaction site, i.e. the MOF growing position could thereby be confined at the interface of the two solvents. It was found that a free-standing membrane could be formed with the combinations of high Zn-H2BDC and low TEA concentrations. The combinations of low Zn-H2BDC and high TEA concentrations yielded MOF particles precipitated out from DMF. Similar results were obtained by changing the liquid-liquid interface to liquid-gas interface, with the TEA-hexane solution replaced by saturated TEA vapor. The dependence of product shape on precursor and catalyst concentrations can be explained by the competition between MOF formation and TEA diffusion into the precursor phase. The morphology, constitution and surface area of the MOF products were characterized by SEM, XRD and nitrogen adsorption testing, respectively. The particles were found to be exclusively MOF-5. The membranes were characterized as asymmetric. The top layer was particulate while the bottom layer had a sheet-like morphology. This was further revealed by XRD data as MOF-5 and MOF-2 (ZnBDC·DMF), respectively. This asymmetry was caused by a change of TEA diffusion rate during the synthesis process, which might result in a change in pH value for the membrane growth. Decent surface areas of the particles and membranes were measured. Apart from the free-standing membranes, MOF membranes on Anodisc support were also synthesized employing the same interfacial techniques. The MOF formation site, i.e. the interface, was confined to the upper end Anodisc pores and sealing the pores after the reaction. The difference in wetting force between DMF and hexane with Anodisc membrane material resulted in the difference of MOF layer morphology from liquid-liquid protocol and liquid-gas protocol. The later gave a continuous MOF membrane due to the absence of air bubble interference.

Master of Science (MSc)

Advisors/Committee Members: Zhu, Shiping, Chemical Engineering.

Subjects/Keywords: Interfacial synthesis; metal organic framework membranes; Membrane Science; Membrane Science

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APA (6^th Edition):

Lu, H. (2012). Interfacial Synthesis of Metal-organic Frameworks. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/12288

Chicago Manual of Style (16^th Edition):

Lu, Hongyu. “Interfacial Synthesis of Metal-organic Frameworks.” 2012. Masters Thesis, McMaster University. Accessed January 18, 2021. http://hdl.handle.net/11375/12288.

MLA Handbook (7^th Edition):

Lu, Hongyu. “Interfacial Synthesis of Metal-organic Frameworks.” 2012. Web. 18 Jan 2021.

Vancouver:

Lu H. Interfacial Synthesis of Metal-organic Frameworks. [Internet] [Masters thesis]. McMaster University; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11375/12288.

Council of Science Editors:

Lu H. Interfacial Synthesis of Metal-organic Frameworks. [Masters Thesis]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/12288

7. McDonnell, Marshall T. Mass and Charge Transport in Hydrated Polymeric Membranes.

Degree: 2016, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/3946

► Mass and charge transport through hydrated polymer membranes has significant importance for many areas of engineering and industry. Multi-scale modeling and simulation techniques were used… (more)

▼ Mass and charge transport through hydrated polymer membranes has significant importance for many areas of engineering and industry. Multi-scale modeling and simulation techniques were used to study transport in relation to two specific membrane applications: (1) food packaging and (2) additives for polymer electrolytes. Chitosan/chitin films were studied due to their use as a sustainable, biodegradable food packaging film. The effects of hydration on the solvation, diffusivity, solubility, and permeability of oxygen molecules in these films were studied via molecular dynamics and confined random walk simulations. With increasing hydration, the membrane was observed to have a more homogeneous water distribution with the polymer chains being fully solvated. Insight from this work will help guide molecular modeling of chitosan/chitin membranes and experimental synthesis of these membranes, specifically highlighting efforts to chemically tailor chitosan membranes to favor discrete as opposed to continuous aqueous domains to help reduce oxygen permeability. Additives for proton exchange membranes (PEMs) were studied to aid in the developing next-generation membrane materials for fuel cell applications. We calculate and present predictions of our analytical model that describes the fundamental relationship between the nanoscale structure of PEMs and their proton conductivity using a set of structural descriptors, accounting for nanopore size, functionalization and connectivity in order to predict proton conductivities in PEMs. The model reproduces experimentally determined conductivities in two current PEM materials. To extend the model based on structural descriptors of PEMs, we studied polyethylene glycol (PEG), a polymer used in electrochemistry applications due to it hydrophilicity and pH-dependent behavior in aqueous environments. We conducted ab initio molecular dynamics simulations of an excess proton in bulk water and aqueous triethylene glycol (TEG) solution and reactive molecular dynamics simulations of an excess proton in bulk water, aqueous TEG solution, and aqueous PEG solution. We determined differences in protonic defect structures, kinetics, thermodynamics, and hydrogen-bond networks associated with structural diffusion between systems. Driving forces for polymeric membrane design goals include economics, efficiency, energy consumption and sustainable production. Insight from this work hopes to aid in determining key design parameters and reduce time-to-discovery for developing next-generation polymeric membranes.

Subjects/Keywords: Polymer; Membrane; Molecular Dynamics; Proton Transport; Modeling; Membrane Science; Polymer Science

11 more images…

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APA (6^th Edition):

McDonnell, M. T. (2016). Mass and Charge Transport in Hydrated Polymeric Membranes. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/3946

Chicago Manual of Style (16^th Edition):

McDonnell, Marshall T. “Mass and Charge Transport in Hydrated Polymeric Membranes.” 2016. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed January 18, 2021. https://trace.tennessee.edu/utk_graddiss/3946.

MLA Handbook (7^th Edition):

McDonnell, Marshall T. “Mass and Charge Transport in Hydrated Polymeric Membranes.” 2016. Web. 18 Jan 2021.

Vancouver:

McDonnell MT. Mass and Charge Transport in Hydrated Polymeric Membranes. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2016. [cited 2021 Jan 18]. Available from: https://trace.tennessee.edu/utk_graddiss/3946.

Council of Science Editors:

McDonnell MT. Mass and Charge Transport in Hydrated Polymeric Membranes. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2016. Available from: https://trace.tennessee.edu/utk_graddiss/3946

McMaster University

8. Mah, Evan G. FABRICATION OF PAPER BASED THERMO-RESPONSIVE MEMBRANES AND INVESTIGATION FOR THEIR USE IN ADSORPTION OF EMERGING WATER CONTAMINANTS.

Degree: MASc, 2012, McMaster University

URL: http://hdl.handle.net/11375/12545

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Endocrine disrupting substances have been frequently reported to exist in potent concentrations in wastewater treatment plant effluent and other surface waters. Common techniques of… (more)

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Endocrine disrupting substances have been frequently reported to exist in potent concentrations in wastewater treatment plant effluent and other surface waters. Common techniques of wastewater treatment have varied effectiveness to remove estrogens from wastewater. A thermo-responsive smart membrane technology is investigated for its use in adsorptive removal of 17β-estradiol from a background electrolyte solution. A simplified fabrication method is adapted for hydrogel-substrate composite thermo-responsive membranes. Deposition of hydrogel occurs through aqueous polymerization in a coating process dissimilar to common grafting techniques. Acrylamide and acrylic acid monomers are polymerized in two different structures, a random copolymer as well as an interpenetrating network, to form a positive volume-phase transition hydrogel coating. Subsequent membranes experience high permeability at low temperatures with a gating mechanism reducing permeability upon heating. The effects of crosslinker content, monomer ratio, mass loading and butylmethacrylate content are investigate. Only mass loading was found to have significant influence on the behaviour of the membranes in all cases. The variations of the other factors were too little to have great influence. The membranes with the most stable permeability response function were then used in 17β-estradiol adsorption tests, investigating the binding capacity at both colder water temperatures (10 °C) and warmer water temperatures (40 °C). In the collapse and swelling of the volume-phase transitions, the membranes changed their solution properties which were hypothesized to also alter surface functionality. After introducing the estradiol sample, the membranes were subjected to temperature change with the expectation that any bound material would elute once the surface functionality of the membranes became adequately altered. Only some membranes produced an elution fraction while others appeared to undergo irreversible binding with a possible delayed elution. Removal of dosed 17β-estradiol is reported as adsorbed mass per area of membrane.

Master of Applied Science (MASc)

Advisors/Committee Members: Ghosh, Raja, Pelton, Robert, Fillipe, Carlos, Chemical Engineering.

Subjects/Keywords: Hydrogel; Oestrogen; Permeability; Positive volume-phase transition; UCST; Membrane Science; Polymer Science; Membrane Science

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APA (6^th Edition):

Mah, E. G. (2012). FABRICATION OF PAPER BASED THERMO-RESPONSIVE MEMBRANES AND INVESTIGATION FOR THEIR USE IN ADSORPTION OF EMERGING WATER CONTAMINANTS. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/12545

Chicago Manual of Style (16^th Edition):

Mah, Evan G. “FABRICATION OF PAPER BASED THERMO-RESPONSIVE MEMBRANES AND INVESTIGATION FOR THEIR USE IN ADSORPTION OF EMERGING WATER CONTAMINANTS.” 2012. Masters Thesis, McMaster University. Accessed January 18, 2021. http://hdl.handle.net/11375/12545.

MLA Handbook (7^th Edition):

Mah, Evan G. “FABRICATION OF PAPER BASED THERMO-RESPONSIVE MEMBRANES AND INVESTIGATION FOR THEIR USE IN ADSORPTION OF EMERGING WATER CONTAMINANTS.” 2012. Web. 18 Jan 2021.

Vancouver:

Mah EG. FABRICATION OF PAPER BASED THERMO-RESPONSIVE MEMBRANES AND INVESTIGATION FOR THEIR USE IN ADSORPTION OF EMERGING WATER CONTAMINANTS. [Internet] [Masters thesis]. McMaster University; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11375/12545.

Council of Science Editors:

Mah EG. FABRICATION OF PAPER BASED THERMO-RESPONSIVE MEMBRANES AND INVESTIGATION FOR THEIR USE IN ADSORPTION OF EMERGING WATER CONTAMINANTS. [Masters Thesis]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/12545

Anna University

9. Vidya S. Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes;.

Degree: Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/27196

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Membrane separation techniques are being used in various industries such as chemical pharmaceutical and metal finishing industries These techniques allow not only energy and cost… (more)

Subjects/Keywords:

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APA (6^th Edition):

S, V. (2014). Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/27196

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):

S, Vidya. “Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes;.” 2014. Thesis, Anna University. Accessed January 18, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/27196.

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

MLA Handbook (7^th Edition):

S, Vidya. “Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes;.” 2014. Web. 18 Jan 2021.

Vancouver:

S V. Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27196.

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

Council of Science Editors:

S V. Studies on cellulose acetate polymethylmethacrylate and polystyrene blend ultrafiltration membranes;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27196

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

University of Arkansas

10. Sardari, Kamyar. Membrane-based Separation Processes for Treating High Salinity Produced Waters.

Degree: PhD, 2018, University of Arkansas

URL: https://scholarworks.uark.edu/etd/2840

► Produced waters (PW) generated in the oil and gas industry within the United States often contain extreme levels of total dissolved solids (TDS). These… (more)

▼ Produced waters (PW) generated in the oil and gas industry within the United States often contain extreme levels of total dissolved solids (TDS). These high TDS waste streams need to be treated cost-effectively as the costs associated with the current management techniques can exceed 15 USD per barrel of discharged PW. Thermally and osmotically-driven membrane separation technologies can show promising potential for treating high TDS waste streams, as onsite low-grade waste heat may be used for their operation. In this dissertation, the application of membrane distillation (MD), forward osmosis (FO) and a hybrid FO-MD process for treating synthetic and actual high TDS PW is investigated. The aim is to maximize water recovery and minimize the high TDS sludge volume. A number of commercially available hydrophobic membranes with varying properties have been extensively characterized and tested in a bench-scale MD system. A bulk membrane structural parameter has been defined and used to identify membranes that display the highest permeate fluxes. Then, the maximum achievable brine concentration for higher flux membranes was determined. When treating actual PW feed streams, which contain not only high TDS, but also dissolved organics, surfactants and low surface tension contaminants, pretreatment of the feed is essential to suppress the onset of membrane fouling. In this study, the feasibility of electrocoagulation (EC) followed by MD is investigated. EC was reported effective in mitigating fouling during MD. FO is another emerging membrane-based separation technology that could find niche applications in the treatment of oil and gas PW. Here, the feasibility of treating hydraulic fracturing PW using a combined EC-FO process has been investigated. EC is shown to be effective for removing suspended solids and organic compounds which foul the membrane during FO. By accounting for internal and external concentration polarization as well as fouling, the expected FO flux may be determined. Finally, we have studied hybrid FO-MD system and shown that this process integration can combine the advantages of both processes; low fouling tendency and high quality permeate. The actual treatment used, EC-MD, EC-FO or EC-FO-MD will depend on the quality of the PW. Advisors/Committee Members: Ranil Wickramasinghe, David Ford, Lauren Greenlee.

Subjects/Keywords: Electrocoagulation; Forward Osmosis; Fouling; Membrane Distillation; Produced Water; Treatment; Membrane Science

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APA (6^th Edition):

Sardari, K. (2018). Membrane-based Separation Processes for Treating High Salinity Produced Waters. (Doctoral Dissertation). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2840

Chicago Manual of Style (16^th Edition):

Sardari, Kamyar. “Membrane-based Separation Processes for Treating High Salinity Produced Waters.” 2018. Doctoral Dissertation, University of Arkansas. Accessed January 18, 2021. https://scholarworks.uark.edu/etd/2840.

MLA Handbook (7^th Edition):

Sardari, Kamyar. “Membrane-based Separation Processes for Treating High Salinity Produced Waters.” 2018. Web. 18 Jan 2021.

Vancouver:

Sardari K. Membrane-based Separation Processes for Treating High Salinity Produced Waters. [Internet] [Doctoral dissertation]. University of Arkansas; 2018. [cited 2021 Jan 18]. Available from: https://scholarworks.uark.edu/etd/2840.

Council of Science Editors:

Sardari K. Membrane-based Separation Processes for Treating High Salinity Produced Waters. [Doctoral Dissertation]. University of Arkansas; 2018. Available from: https://scholarworks.uark.edu/etd/2840

Anna University

11. Yogalakshmi, K N. Performance of membrane bioreactor under shock load conditions; -.

Degree: Science and Humanities, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/27366

►

Increasing demands of clean water coupled with problems of water newlinescarcity and environmental pollution makes water reuse essential Membrane newlineBioreactor MBR is a promising technological… (more)

Subjects/Keywords: environmental pollution; membrane bioreactor; science and humanities

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APA (6^th Edition):

Yogalakshmi, K. N. (2014). Performance of membrane bioreactor under shock load conditions; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/27366

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):

Yogalakshmi, K N. “Performance of membrane bioreactor under shock load conditions; -.” 2014. Thesis, Anna University. Accessed January 18, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/27366.

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

MLA Handbook (7^th Edition):

Yogalakshmi, K N. “Performance of membrane bioreactor under shock load conditions; -.” 2014. Web. 18 Jan 2021.

Vancouver:

Yogalakshmi KN. Performance of membrane bioreactor under shock load conditions; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27366.

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

Council of Science Editors:

Yogalakshmi KN. Performance of membrane bioreactor under shock load conditions; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27366

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

University of Arkansas

12. Najafi, Helya. Peptoid-modified Bicelles as Surrogate Cell Membranes for Membrane Protein Sensors and Analytics.

Degree: PhD, 2017, University of Arkansas

URL: https://scholarworks.uark.edu/etd/2605

► Membrane-affiliated interactions are significant in understanding cell function, detecting biomarkers to diagnose disease, and in testing the efficiency of new therapeutic targets. Model membrane… (more)

▼ Membrane-affiliated interactions are significant in understanding cell function, detecting biomarkers to diagnose disease, and in testing the efficiency of new therapeutic targets. Model membrane systems have been developed to study membrane proteins, allowing for stable protein structure and maintaining native activity. Bicelles, disc-shaped lipid bilayers created by combining long- and short-chain phospholipids, are the model membrane system of focus in this study. Bicelles are accessible from both sides and have a wide size range, which make them attractive for studying membrane proteins without affecting function. In this work, bicelles were functionalized with two peptoids to alter the edge and face chemistry. Peptoids are suitable for this application because of the large diversity of available side chain chemistries that can be easily incorporated in a sequence-specific manner. The peptoids sequence consist of three functional regions to promote insertion into the edge of bicelles. The insertion sequence at the C-terminus contains two alkyl chains and two hydrophobic, chiral aromatic groups that anchor into the bicelle edge or face. The facially amphipathic helix contains chiral aromatic groups on one side that interact with the lipid tails and positively charged groups on the other side, which interact with the lipid head groups. Thiol groups are included at the N-terminus to allow for determination of peptoid location in the bicelle. Bicelle morphology and size were assessed by transmission electron microscopy (TEM) and dynamic light scattering (DLS). Peptoid location in the bicelle was determined by attachment of gold nanoparticles, which confirm preferential incorporation of the peptoid into the bicelle edge or face. Results from this study show that peptoid-functionalized bicelles are a promising model membrane system. Specifically, the designed peptoids sequence were found to incorporate preferentially into the edges and faces of bicelles with 82% and 92% specificity, respectively. Additionally, the peptoid-functionalized bicelles are of similar size and morphology to non-functionalized bicelles. Potential applications would include customization to anchor in biosensors or facilitate interactions with specific membrane proteins or complexes. Advisors/Committee Members: Shannon Servoss, Robert Beitle.

Subjects/Keywords: Biochemical and Biomolecular Engineering; Membrane Science

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APA (6^th Edition):

Najafi, H. (2017). Peptoid-modified Bicelles as Surrogate Cell Membranes for Membrane Protein Sensors and Analytics. (Doctoral Dissertation). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2605

Chicago Manual of Style (16^th Edition):

Najafi, Helya. “Peptoid-modified Bicelles as Surrogate Cell Membranes for Membrane Protein Sensors and Analytics.” 2017. Doctoral Dissertation, University of Arkansas. Accessed January 18, 2021. https://scholarworks.uark.edu/etd/2605.

MLA Handbook (7^th Edition):

Najafi, Helya. “Peptoid-modified Bicelles as Surrogate Cell Membranes for Membrane Protein Sensors and Analytics.” 2017. Web. 18 Jan 2021.

Vancouver:

Najafi H. Peptoid-modified Bicelles as Surrogate Cell Membranes for Membrane Protein Sensors and Analytics. [Internet] [Doctoral dissertation]. University of Arkansas; 2017. [cited 2021 Jan 18]. Available from: https://scholarworks.uark.edu/etd/2605.

Council of Science Editors:

Najafi H. Peptoid-modified Bicelles as Surrogate Cell Membranes for Membrane Protein Sensors and Analytics. [Doctoral Dissertation]. University of Arkansas; 2017. Available from: https://scholarworks.uark.edu/etd/2605

University of Tennessee – Knoxville

13. Mirzaeifard, Sina. Analytical and Computational Modeling of Membrane Nanotubes.

Degree: MS, Chemical Engineering, 2014, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_gradthes/3194

► This thesis investigates the interplay between cell membranes and the actin cytoskeleton in cellular structures known as membrane nanotubes. Membrane nanotubes are slender membrane… (more)

▼ This thesis investigates the interplay between cell membranes and the actin cytoskeleton in cellular structures known as membrane nanotubes. Membrane nanotubes are slender membrane structures that physically connect cells over long distances, and experiments suggest that they play a role in transferring material and information between cells. Disrupting the actin cytoskeleton disrupts membrane nanotubes. Although recent studies have revealed insight into the physical properties and functions of membrane-actin systems, further research is needed to understand their behavior in biological contexts. Membrane nanotubes provide a novel system with which to investigate interactions between the cell membrane and actin. In this thesis, we use analytical theory and computer simulations to better understand actin filaments enclosed in membrane nanotubes. We begin by describing a theoretical framework based on continuum models of membranes and actin polymers. Using analytical theory, we calculate the energies of various polymer-membrane configurations. Although confined biopolymers are often assumed to adopt helical configurations, we demonstrate that an alternative configuration is energetically favorable in a wide range of parameter space. We then employ Monte Carlo simulations to investigate the equilibrium behavior of a semiflexible polymer confined within spatial regions characteristic of membrane nanotube dimensions. To investigate flexible membranes, we use Monte Carlo simulations of discrete, triangulated elastic surfaces. We begin by studying a tubular membrane in isolation and investigate the influence of bending rigidity and tube dimensions on characteristics of the membrane. Finally, we use computer simulations to study a system in which a semiflexible polymer is placed inside of a membrane tube, which serves as a model of a membrane nanotube. We find that the presence of the polymer has small effect on membrane properties for typical cell parameters. Advisors/Committee Members: Steven M. Abel, Brian J. Edwards, Paul M. Dalhaimer.

Subjects/Keywords: Membrane nanotubes; actin filaments; Monte Carlo simulation; semiflexible polymer; fluid membrane; polymerized membrane; Biochemical and Biomolecular Engineering; Computational Engineering; Polymer Science

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APA (6^th Edition):

Mirzaeifard, S. (2014). Analytical and Computational Modeling of Membrane Nanotubes. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/3194

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):

Mirzaeifard, Sina. “Analytical and Computational Modeling of Membrane Nanotubes.” 2014. Thesis, University of Tennessee – Knoxville. Accessed January 18, 2021. https://trace.tennessee.edu/utk_gradthes/3194.

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

MLA Handbook (7^th Edition):

Mirzaeifard, Sina. “Analytical and Computational Modeling of Membrane Nanotubes.” 2014. Web. 18 Jan 2021.

Vancouver:

Mirzaeifard S. Analytical and Computational Modeling of Membrane Nanotubes. [Internet] [Thesis]. University of Tennessee – Knoxville; 2014. [cited 2021 Jan 18]. Available from: https://trace.tennessee.edu/utk_gradthes/3194.

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

Council of Science Editors:

Mirzaeifard S. Analytical and Computational Modeling of Membrane Nanotubes. [Thesis]. University of Tennessee – Knoxville; 2014. Available from: https://trace.tennessee.edu/utk_gradthes/3194

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

University of Kentucky

14. Saad, Anthony. THE DEVELOPMENT OF TEMPERATURE AND PH RESPONSIVE HYDROGELS AND MEMBRANES FOR SELECTIVE SORPTION OF PERFLUOROORGANICS AND NANOPARTICLE INTEGRATED CATALYTIC DEGRADATION OF PCB.

Degree: 2020, University of Kentucky

URL: https://uknowledge.uky.edu/cme_etds/122

► The functionalization and use of responsive and catalytic polymeric membranes and materials were explored for contaminant capture and degradation. While membranes have a wide variety… (more)

▼ The functionalization and use of responsive and catalytic polymeric membranes and materials were explored for contaminant capture and degradation. While membranes have a wide variety of uses across multiple industries, the inclusion of materials that are temperature and pH responsive in the membrane pore domain yields a wide range of applications and possibilities for water treatment. Temperature and pH responsive polymers, as well as controlled nanostructured materials, were synthesized in membrane pores for advanced adsorption-desorption and catalytic treatment of emerging organic contaminants in water. In this study, supported by the NIEHS, poly-N-isopropylacrylamide (PNIPAm) was used as a model thermo-responsive polymer, while perfluorochemicals (PFCs) and polychlorinated biphenyls (PCBs) are used as model emerging water contaminants. A stimuli-responsive membrane-based adsorptive-desorptive system was developed by incorporating PNIPAm and poly-methyl methacrylate (PMMA) into a PVDF membrane structure and quantified through in-situ characterizations. Furthermore, a novel membrane system was developed for enhanced degradation of emerging halo-organics that is both stimuli-responsive and catalytic due to the incorporation of Fe-Pd nanoparticles into the polymeric membrane matrix. By incorporating a thermo-responsive polymer into a membrane platform, temperature was used to control permeability, hydrophilicity, and pollutant partitioning. Solubility parameters of the model contaminants and of the thermo-responsive polymer in its different conformational states were determined. This was used to develop a fundamental understanding of the interaction between the polymer domain and halo-pollutant domain in order to conduct reversible temperature swing adsorption through manipulation of external stimuli. In doing so, PNIPAm’s temperature-responsive behavior and hydrophilic/hydrophobic transition was leveraged for reversible adsorption and desorption of perfluoro-organics from water. Adsorption of perfluorooctanoic acid (PFOA) onto PNIPAm hydrogels yielded adsorption capacities lower than commercially used adsorbents. However, the initial rates of 28 mg/g/h and 41 mg/g/h for adsorption and desorption, respectively, and the ability to reversibly desorb with ease through external temperature manipulation make the use of stimuli-responsive polymeric membranes an exciting avenue for the development of advanced adsorbents that can be easily regenerated. Temperature swing adsorption-desorption of pollutants using the thermo-responsive membrane was demonstrated and quantified. The incorporation of stimuli-responsive polymers as well as reactive bimetallic nanoparticles into membrane pores enabled the development of an advanced stimuli-responsive catalytic membrane for enhanced halo-organic degradation. Iron nanoparticles were used due to iron’s ability to react with water and form hydrogen species, unlike other reactive metal-based nanoparticles that would require a hydrogen source, with Palladium as a reaction catalyst. By…

Subjects/Keywords: Responsive Membrane; Reactive Membrane; Reversible Adsorption; Chloro-organics Removal; Water Treatment; Catalysis and Reaction Engineering; Membrane Science

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APA (6^th Edition):

Saad, A. (2020). THE DEVELOPMENT OF TEMPERATURE AND PH RESPONSIVE HYDROGELS AND MEMBRANES FOR SELECTIVE SORPTION OF PERFLUOROORGANICS AND NANOPARTICLE INTEGRATED CATALYTIC DEGRADATION OF PCB. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cme_etds/122

Chicago Manual of Style (16^th Edition):

Saad, Anthony. “THE DEVELOPMENT OF TEMPERATURE AND PH RESPONSIVE HYDROGELS AND MEMBRANES FOR SELECTIVE SORPTION OF PERFLUOROORGANICS AND NANOPARTICLE INTEGRATED CATALYTIC DEGRADATION OF PCB.” 2020. Doctoral Dissertation, University of Kentucky. Accessed January 18, 2021. https://uknowledge.uky.edu/cme_etds/122.

MLA Handbook (7^th Edition):

Saad, Anthony. “THE DEVELOPMENT OF TEMPERATURE AND PH RESPONSIVE HYDROGELS AND MEMBRANES FOR SELECTIVE SORPTION OF PERFLUOROORGANICS AND NANOPARTICLE INTEGRATED CATALYTIC DEGRADATION OF PCB.” 2020. Web. 18 Jan 2021.

Vancouver:

Saad A. THE DEVELOPMENT OF TEMPERATURE AND PH RESPONSIVE HYDROGELS AND MEMBRANES FOR SELECTIVE SORPTION OF PERFLUOROORGANICS AND NANOPARTICLE INTEGRATED CATALYTIC DEGRADATION OF PCB. [Internet] [Doctoral dissertation]. University of Kentucky; 2020. [cited 2021 Jan 18]. Available from: https://uknowledge.uky.edu/cme_etds/122.

Council of Science Editors:

Saad A. THE DEVELOPMENT OF TEMPERATURE AND PH RESPONSIVE HYDROGELS AND MEMBRANES FOR SELECTIVE SORPTION OF PERFLUOROORGANICS AND NANOPARTICLE INTEGRATED CATALYTIC DEGRADATION OF PCB. [Doctoral Dissertation]. University of Kentucky; 2020. Available from: https://uknowledge.uky.edu/cme_etds/122

University of Melbourne

15. St John, Alexander Michael. Separation of uranium using polymer inclusion membranes.

Degree: 2012, University of Melbourne

URL: http://hdl.handle.net/11343/37703

► Polymer Inclusion Membranes (PIMs) are a relatively new branch of membrane separation technologies which have shown potential for the safe and effective separation of metallic… (more)

▼ Polymer Inclusion Membranes (PIMs) are a relatively new branch of membrane separation technologies which have shown potential for the safe and effective separation of metallic and non-metallic ions and small organic molecules from aqueous solutions. It has been postulated that the use of PIMs as an alternative to liquid-liquid extraction (or solvent extraction, SX) techniques has the potential to reduce occupational and environmental hazards which are commonly associated with solvent extraction processes. The PIM technique involves the encapsulation of a suitable extraction reagent (extractant) in a base polymer matrix, often with the addition of plasticisers or chemical modifiers. The encapsulation process helps minimise loss of extractant into the contacting solution and reduces the inventory of solvents and extractants required for separation processes. This thesis investigates the application of the PIM technique to the separation of uranium from dilute sulfate solutions. Uranium is mined in areas of environmental sensitivity in Australia and a PIM system suitable for use in Australian conditions is investigated. A candidate PIM system is proposed for the separation of uranium and its performance is investigated and evaluated with reference to conditions commonly found in Australian uranium processing. To provide a sound basis for the development of PIM systems, the formulation of PIMs is investigated in detail and a wide range of membrane components are tested for their ability to form chemically homogeneous PIMs of suitable physical characteristics for use in separation processes. The observed behaviour of each membrane component is discussed and rationalised using physicochemical interactions and guidelines for the successful formulation of PIMs are suggested. A novel method for rigorously determining the chemical homogeneity of PIMs on a low micrometre scale using synchrotron-based infrared microspectrometry is demonstrated. A candidate PIM system for the separation of uranium based on di(2-ethylhexyl) phosphoric acid (D2EHPA) and poly(vinyl chloride) (PVC) is investigated. The influence of key variables (including the membrane composition and solution conditions) on the extraction process are studied. A new method for determining the stoichiometry of the extractant-uranium complex is demonstrated and used to show the uranyl cation is extracted from solution by two D2EHPA dimers. The homogeneity of the extracted uranium in the candidate system is confirmed using a new method based on proton-induced x-ray emission microspectrometry (µ-PIXE). The extractive performance of the PIM composed of 40% (m/m) D2EHPA and 60% (m/m) PVC was numerically evaluated and the methods for mathematically modelling the extraction process are discussed; a number of methods for determining the membrane permeability are evaluated. A mathematical model for…

Subjects/Keywords: uranium; polymer inclusion membranes; membrane extraction; mathematical modelling; separation science; membrane transport

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APA (6^th Edition):

St John, A. M. (2012). Separation of uranium using polymer inclusion membranes. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/37703

Chicago Manual of Style (16^th Edition):

St John, Alexander Michael. “Separation of uranium using polymer inclusion membranes.” 2012. Doctoral Dissertation, University of Melbourne. Accessed January 18, 2021. http://hdl.handle.net/11343/37703.

MLA Handbook (7^th Edition):

St John, Alexander Michael. “Separation of uranium using polymer inclusion membranes.” 2012. Web. 18 Jan 2021.

Vancouver:

St John AM. Separation of uranium using polymer inclusion membranes. [Internet] [Doctoral dissertation]. University of Melbourne; 2012. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/11343/37703.

Council of Science Editors:

St John AM. Separation of uranium using polymer inclusion membranes. [Doctoral Dissertation]. University of Melbourne; 2012. Available from: http://hdl.handle.net/11343/37703

University of Arkansas

16. Kamaz, Mohanad. Applications of Ionic Liquids in Membrane Separation.

Degree: PhD, 2019, University of Arkansas

URL: https://scholarworks.uark.edu/etd/3491

► Ionic liquids represent an emerging attractive material in membrane technology. The central theme of this doctoral dissertation is to develope novel membranes using ionic… (more)

▼ Ionic liquids represent an emerging attractive material in membrane technology. The central theme of this doctoral dissertation is to develope novel membranes using ionic liquids. Two different approaches were used to prepare ionic liquid membranes including the immobilization of ionic liquid within the membrane pores or the use of pressure assembly method to deposit a selective ionic liquid layer on the top membrane surface. In chapter 2, imidazolium ionic liquids with three different alkyl halides were successfully synthesized and used to prepare supported ionic liquid membranes (SILMs). SILMs preraper were tested for aqueous and nonaqueous applications. For nonaqueous applications, the trend of separation was found to be divinylbenzene>styrene>toluene, which was attributed to the extended conjugation of π electron cloud. For nonaqueous system, preferential separation of different dyes was achieved. In chapter 3, SILMs have been tested for the fractionation of organic compounds. Fractionation of a feed stream consisting of benzene, naphthalene, and phenanthrene in tetradecane and cis- and trans-stilbene in hexane were investigated. Differences in the π electron cloud density of the aromatic solutes influence their interactions with the imidazolium cation which can affect the rates of transport. In the case of the three aromatic solutes the degree of conjugation and molecular weight increase in the order of benzene, naphthalene, and phenanthrene. However, for cis-and trans-stilbene, the mass transfer coefficient was larger for all three ionic liquids. Aqueous SILM was used as the liquid membrane phase to fractionate two nucleobases: thymine and cytosine in water. The mass transfer coefficient for thymine was 5.5 times greater than cytosine indicating the possibility of exploiting multimodal interactions fractionate compounds. Chapter 4 constitutes the preparation of novel polyionic liquid augmented membranes that were fabricated using pressure assisted self-assembly and employed for π- electron cloud mediated separation of aromatics from their aliphatic homologs. The prepared membranes can be employed for the fractionation of aromatics such as benzene, toluene, p-xylene, nitrobenzene. Further, these augmented membranes were demonstrated to have preferential separation of one stereoisomer over others. Finally, chapter 5 includes conclusions drawn out of this research and future directions and recommendations. Advisors/Committee Members: Ranil Wickramasinghe, David Ford, Ed Clauson.

Subjects/Keywords: Aromatic separation; Ionic liquids; Membrane separation; Complex Fluids; Membrane Science; Transport Phenomena

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APA (6^th Edition):

Kamaz, M. (2019). Applications of Ionic Liquids in Membrane Separation. (Doctoral Dissertation). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/3491

Chicago Manual of Style (16^th Edition):

Kamaz, Mohanad. “Applications of Ionic Liquids in Membrane Separation.” 2019. Doctoral Dissertation, University of Arkansas. Accessed January 18, 2021. https://scholarworks.uark.edu/etd/3491.

MLA Handbook (7^th Edition):

Kamaz, Mohanad. “Applications of Ionic Liquids in Membrane Separation.” 2019. Web. 18 Jan 2021.

Vancouver:

Kamaz M. Applications of Ionic Liquids in Membrane Separation. [Internet] [Doctoral dissertation]. University of Arkansas; 2019. [cited 2021 Jan 18]. Available from: https://scholarworks.uark.edu/etd/3491.

Council of Science Editors:

Kamaz M. Applications of Ionic Liquids in Membrane Separation. [Doctoral Dissertation]. University of Arkansas; 2019. Available from: https://scholarworks.uark.edu/etd/3491

University of Arkansas

17. Kamaz, Mohanad Ali Abdulsahib. Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor.

Degree: MSChE, 2017, University of Arkansas

URL: https://scholarworks.uark.edu/etd/2384

► The presence of endocrine disrupting compounds (EDCs) and pharmaceutically active compounds (PhAC) such as pesticides, personal care products, antibiotics and pharmaceutical compounds, in sewage,… (more)

▼ The presence of endocrine disrupting compounds (EDCs) and pharmaceutically active compounds (PhAC) such as pesticides, personal care products, antibiotics and pharmaceutical compounds, in sewage, industrial, and domestic waters has extensively become the major concern for health and environmental organizations. These compounds have the ability to interact with mammalian endocrine system and disrupting their functions. The traditional activated sludge processes are designed to degrade solids, organic carbon and nitrogen loading. Although several treatment steps in a wastewater treatment plant can contribute to partial removal of EDCs, effective removal has been a challenge due to their resistant chemical and biological degradation and extreme low concentrations. Membrane bioreactor (MBR) used in this study is novella better water reclamation technology that shows several advantages including stable operation conditions due to long solid retention time (SRT); concentrated mixed liquor suspended solids (MLSS); and low F/M ration in comparison with conventional wastewater treatment. This research will utilize these advanced membrane technologies to develop wastewater treatment processes for removal of EDCs in order to recover and reuse wastewater to augment drinking water supplies. A set of model EDCs including acetaminophen, amoxicillin, atrazine, estrone, and triclosan were selected to study the removal by membrane bioreactor. Those compounds were chosen based on their concentrations present in Oklahoma and Arkansas wastewater and to represent each group of compounds. Optimized HPLC method was used for detection of these model compounds. A Lab-scale MBR operated with real wastewater was tested under different operating conditions, such as retention time and volatile suspended solids concentrations to remove the spiked EDCs. The module MBR can reach desired chemical oxygen demand COD (< 30 ppm), Total nitrogen <10 ppm, and Nitrate nitrogen < 5 ppm in different retention times. MBR have shown removal of amoxicillin, acetaminophen, triclosan with the efficiency can reach 100% while (50-55) % removal of atrazine can be achieved. Estrone disappearance was also more than 90%. Advisors/Committee Members: Xianghong Qian, Ranil Wickramasinghe, Wen Zhang.

Subjects/Keywords: Endocrine Disrupting Compounds; Membrane Bioreactor; Microfiltration; Wastewater Treatment; Biochemistry; Endocrinology; Membrane Science

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APA (6^th Edition):

Kamaz, M. A. A. (2017). Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor. (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2384

Chicago Manual of Style (16^th Edition):

Kamaz, Mohanad Ali Abdulsahib. “Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor.” 2017. Masters Thesis, University of Arkansas. Accessed January 18, 2021. https://scholarworks.uark.edu/etd/2384.

MLA Handbook (7^th Edition):

Kamaz, Mohanad Ali Abdulsahib. “Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor.” 2017. Web. 18 Jan 2021.

Vancouver:

Kamaz MAA. Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor. [Internet] [Masters thesis]. University of Arkansas; 2017. [cited 2021 Jan 18]. Available from: https://scholarworks.uark.edu/etd/2384.

Council of Science Editors:

Kamaz MAA. Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor. [Masters Thesis]. University of Arkansas; 2017. Available from: https://scholarworks.uark.edu/etd/2384

University of Arkansas

18. Vu, Anh T. Membrane Surface Engineering for Biochemical Applications.

Degree: PhD, 2017, University of Arkansas

URL: https://scholarworks.uark.edu/etd/2497

► Synthetic membranes have been frequently used for many fields, such as, the food and beverage, biopharmaceutical, and biofuel industries. In the beer industry, microfiltration… (more)

▼ Synthetic membranes have been frequently used for many fields, such as, the food and beverage, biopharmaceutical, and biofuel industries. In the beer industry, microfiltration frequently suffers from fouling due to the interaction between different species. It is shown that polyphenols can form cross-links with protein molecules, forming insoluble aggregates. However, by adding an optimal amount of polysaccharides these aggregates can be disrupted thus reducing fouling by the aggregates. Confocal laser scanning microscopy (CLSM) is a powerful technique to locate the foulants inside the wet membrane in order to understand more about the behavior of fouling in microfiltration. Membrane surface modification is used to impart desirable membrane surface properties. Here membrane surface modification is used to develop membrane adsorbers for protein purification. Hydrophobic interaction membrane chromatography (HIMC) has gained interest due to its excellent performance in purification humanized monoclonal antibodies. HIMC affords all the advantages of membrane adsorbers, which is dynamic capacities that are independent of flow rate, higher throughput and easy to scale up. Unique inverse colloidal crystal (ICC) membranes were developed with highly periodic structures, high porosity, and fully interconnected pores. ICC membranes offer a very high binding capacity for IgG4. On the other hand, salt responsive membranes were developed by grafting responsive ligand, poly vinylcaprolactam (PVCL), from the surface of the membrane by atom transfer radical polymerization (ATRP). The nanostructure can vary its conformation and hydrophobicity when the temperature changes. After modification, membrane is able to provide a very high recovery and yield. Membrane modification is also well applied for biofuel industry. Duel nanostructures, poly styrene sulfonic acid (PSSA) and poly ionic liquid (PIL) were grafted separately and neighborly from the surface of ceramic membrane substrate by control ATRP and UV initiated radical polymerization. Modified membrane substrates were challenged with cellulose and corn-stovers biomass hydrolysis in pure ionic liquid (IL) and mixture of IL and co-solvent. High yield in total reducing sugar (TRS), 95% and 60% for cellulose and corn-stovers biomass respectively, indicates strong activity of polymeric solid acid catalysts. Advisors/Committee Members: Ranil Wickramasinghe, Mathias Ulbricht, Ravi Barabote.

Subjects/Keywords: ATRP; Beverage industry; Biochemical; Membrane; Surface modification; Biochemistry; Membrane Science; Petroleum Engineering

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APA (6^th Edition):

Vu, A. T. (2017). Membrane Surface Engineering for Biochemical Applications. (Doctoral Dissertation). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/2497

Chicago Manual of Style (16^th Edition):

Vu, Anh T. “Membrane Surface Engineering for Biochemical Applications.” 2017. Doctoral Dissertation, University of Arkansas. Accessed January 18, 2021. https://scholarworks.uark.edu/etd/2497.

MLA Handbook (7^th Edition):

Vu, Anh T. “Membrane Surface Engineering for Biochemical Applications.” 2017. Web. 18 Jan 2021.

Vancouver:

Vu AT. Membrane Surface Engineering for Biochemical Applications. [Internet] [Doctoral dissertation]. University of Arkansas; 2017. [cited 2021 Jan 18]. Available from: https://scholarworks.uark.edu/etd/2497.

Council of Science Editors:

Vu AT. Membrane Surface Engineering for Biochemical Applications. [Doctoral Dissertation]. University of Arkansas; 2017. Available from: https://scholarworks.uark.edu/etd/2497

University of Kentucky

19. Alexander, Joseph V. Long Term Blood Oxygenation Membranes.

Degree: 2015, University of Kentucky

URL: https://uknowledge.uky.edu/cbme_etds/28

► Hollow fiber membranes are widely used in blood oxygenators to remove carbon dioxide and add oxygen during cardiopulmonary bypass operations. These devices are now widely… (more)

Subjects/Keywords: Membrane; Blood Oxygenation; ATRP; Biomaterials; Biomechanics and Biotransport; Membrane Science; Other Biomedical Engineering and Bioengineering

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APA (6^th Edition):

Alexander, J. V. (2015). Long Term Blood Oxygenation Membranes. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cbme_etds/28

Chicago Manual of Style (16^th Edition):

Alexander, Joseph V. “Long Term Blood Oxygenation Membranes.” 2015. Doctoral Dissertation, University of Kentucky. Accessed January 18, 2021. https://uknowledge.uky.edu/cbme_etds/28.

MLA Handbook (7^th Edition):

Alexander, Joseph V. “Long Term Blood Oxygenation Membranes.” 2015. Web. 18 Jan 2021.

Vancouver:

Alexander JV. Long Term Blood Oxygenation Membranes. [Internet] [Doctoral dissertation]. University of Kentucky; 2015. [cited 2021 Jan 18]. Available from: https://uknowledge.uky.edu/cbme_etds/28.

Council of Science Editors:

Alexander JV. Long Term Blood Oxygenation Membranes. [Doctoral Dissertation]. University of Kentucky; 2015. Available from: https://uknowledge.uky.edu/cbme_etds/28

University of Kentucky

20. Wan, Hongyi. BIMETALLIC NANOPARTICLES INTEGRATED MEMBRANES FOR GROUNDWATER REMEDIATION: SYNTHESIS, CHARACTERIZATION AND APPLICATIONS.

Degree: 2020, University of Kentucky

URL: https://uknowledge.uky.edu/cme_etds/113

► The detoxification of chlorinated organics from groundwater, such as trichloroethylene (TCE), tetrachloroethylene (PCE), polychlorinated biphenyl (PCB) and carbon tetrachloride (CTC), is a challenging area. Reductive… (more)

▼ The detoxification of chlorinated organics from groundwater, such as trichloroethylene (TCE), tetrachloroethylene (PCE), polychlorinated biphenyl (PCB) and carbon tetrachloride (CTC), is a challenging area. Reductive dechlorination has been investigated using iron and iron-based nanoparticles, such as bare Fe, sulfidized Fe (S-Fe) and palladized Fe (Pd-Fe). However, issues including particle agglomeration, difficulties in recycling and particle leaching have been reported to hinder the application and wide usage of these techniques. The integration of nanoparticles and membranes can address these issues because of the large surface area, stability, and the potential for versatile functionalities. In this study, commercial polyvinylidene difluoride (PVDF) microfiltration membranes were functionalized with poly (acrylic acid) (PAA) or poly (methacrylic acid) (PMAA). The functionalization allows the in-situ generation of iron-based nanoparticles through ion-exchange and reduction processes. These membranes were then tested for the removal of chlorinated organics from synthetic and site groundwater. Both the PAA and PMAA functionalization showed a responsive behavior in water flux through membranes. The deprotonation of carboxyl groups (-COOH → -COO-) makes PAA or PMAA become hydrophilic when pH > pKa. Membrane permeability was decreased by 5-30 folds when pH increases from 2.3 to 10.5. PAA and PMAA are anionic polymers in the water at neutral and basic pH, which can capture metal cations for the in-situ synthesis of metallic nanoparticles through a reduction reaction. Uniform Pd-Fe particles with a size of 17.1 ± 4.9 nm were quantified throughout the pores of membranes using a developed focused ion beam cross-sectioning method. The reactive particles incorporated membranes presented over 96% degradation of 3,3',4,4',5-pentachlorobiphenyl (PCB-126) in less than 15 s residence time in passing through the membrane domains. Roles of Pd fractions, particle compositions and water parameters (pH and temperature) in degradation were evaluated using 2-chlorobiphenyl (PCB-1) as a model compound. The H2 evolution (Fe corrosion in water) was quantified with various Pd coverages on the Fe surface. H2 can be activated by catalytic Pd for the hydrodechlorination reaction. However, insufficient H2 production was observed under the higher Pd coverage (>10.4%, corresponding to 5.5 wt%), resulting in the hindrance of dechlorination. Pd fractions from 0.5 wt% to 5.5 wt% (1.0% to 10.4% Pd coverage) yielded higher dechlorination performance. In addition, Pd-Fe bimetallic nanoparticles showed an18-fold mass normalized reaction rate (kmass) than that of isolated Pd and Fe nanoparticles. The investigation of nanoparticles’ intrinsic properties and PCB degradation guided the application of the Pd-Fe nanoparticles incorporated membranes in the treatment of contaminated groundwater. Cooperating with Arcadis Us Inc. (a global environmental consulting firm), the contaminant groundwater was obtained from a hazardous waste site in Louisville, KY. In a…

Subjects/Keywords: Reactive Membrane; Groundwater Remediation; Long-term Study; Advanced Characterization; Chloro-organics Removal; Regeneration; Catalysis and Reaction Engineering; Membrane Science; Polymer Science

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

APA (6^th Edition):

Wan, H. (2020). BIMETALLIC NANOPARTICLES INTEGRATED MEMBRANES FOR GROUNDWATER REMEDIATION: SYNTHESIS, CHARACTERIZATION AND APPLICATIONS. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cme_etds/113

Chicago Manual of Style (16^th Edition):

Wan, Hongyi. “BIMETALLIC NANOPARTICLES INTEGRATED MEMBRANES FOR GROUNDWATER REMEDIATION: SYNTHESIS, CHARACTERIZATION AND APPLICATIONS.” 2020. Doctoral Dissertation, University of Kentucky. Accessed January 18, 2021. https://uknowledge.uky.edu/cme_etds/113.

MLA Handbook (7^th Edition):

Wan, Hongyi. “BIMETALLIC NANOPARTICLES INTEGRATED MEMBRANES FOR GROUNDWATER REMEDIATION: SYNTHESIS, CHARACTERIZATION AND APPLICATIONS.” 2020. Web. 18 Jan 2021.

Vancouver:

Wan H. BIMETALLIC NANOPARTICLES INTEGRATED MEMBRANES FOR GROUNDWATER REMEDIATION: SYNTHESIS, CHARACTERIZATION AND APPLICATIONS. [Internet] [Doctoral dissertation]. University of Kentucky; 2020. [cited 2021 Jan 18]. Available from: https://uknowledge.uky.edu/cme_etds/113.

Council of Science Editors:

Wan H. BIMETALLIC NANOPARTICLES INTEGRATED MEMBRANES FOR GROUNDWATER REMEDIATION: SYNTHESIS, CHARACTERIZATION AND APPLICATIONS. [Doctoral Dissertation]. University of Kentucky; 2020. Available from: https://uknowledge.uky.edu/cme_etds/113

University of Kentucky

21. Dong, Xiaobo. A THERMODYNAMIC AND FEASIBILITY STUDY OF GREEN SOLVENTS FOR THE FABRICATION OF WATER TREATMENT MEMBRANES.

Degree: 2020, University of Kentucky

URL: https://uknowledge.uky.edu/cme_etds/124

► Nonsolvent induced phase separation (NIPS) has been widely used to fabricate polymeric membranes. In NIPS, a polymer is dissolved in a solvent to form a… (more)

▼ Nonsolvent induced phase separation (NIPS) has been widely used to fabricate polymeric membranes. In NIPS, a polymer is dissolved in a solvent to form a dope solution, which is then cast on a substrate and immersed in a nonsolvent bath, where phase inversion occurs. Petroleum-derived organic solvents, such as N-Methyl-2-Pyrrolidone (NMP) and Dimethylacetamide (DMAc), have been traditionally used to fabricate polymeric membranes via NIPS. However, these solvents may have negative impacts on environmental and human health; therefore, using greener and less toxic solvents, preferably derived from biomass, is of great interest to make membrane fabrication sustainable. In this dissertation, two low-hazard solvents, Methyl 5-(Dimethylamino)-2-Methyl-5-Oxopentanoate (Rhodiasolv® PolarClean) and Gamma-Valerolactone (GVL), were investigated as sole- and as cosolvents to cast Polysulfone (PSf) membranes via NIPS. In the first part of this project, Rhodiasolv PolarClean was studied. PolarClean is a bio-derived, biodegradable, nonflammable and nonvolatile solvent. From cloud point curves, PolarClean shows potential to be a solvent for polysulfone. Membranes prepared with PolarClean were investigated in terms of their morphology, porosity, water permeability and protein rejection, and were compared to membranes prepared with traditional solvents. The pores of polysulfone/PolarClean membranes were sponge-like, and the membranes displayed higher water flux values along with slightly higher solute rejection. On the other hand, PSf/DMAc membrane pores were finger-like with lower water flux and slightly lower solute rejection when compared to PSf/PolarClean membranes. Upon reverse-flow filtration to simulate membrane cleaning, it was observed that the pores of PSf/PolarClean membranes collapsed. To address this issue, GVL was investigated as a sole solvent and a cosolvent with PolarClean to fabricate PSf membranes. Membranes prepared using GVL as a sole solvent were observed to be gelatinous, hence not ideal for filtration. On the other hand, when GVL and PolarClean were used as cosolvents, viable membranes were cast with surface charge and hydrophicility not being significantly different from membranes made using PolarClean alone. Furthermore, the average pore size of membranes decreased as the weight percent of GVL in dope solutions increased. Therefore, the use of PolarClean/GVL as cosolvents shows promise for the fabrication of PSf membranes. With respect to operation, membranes cast from dope solutions containing equal amounts of PolarClean and GVL displayed the most similar flux curves and solute rejection to those made using the traditional solvent tested. Once it was determined that membranes made using PolarClean and GVL as cosolvents were viable and showed similar morphological and operational characteristics to those made using DMAc, the use of PolarClean/GVL cosolvents was then researched at the production scale. In the last portion of this study, a slot die-roll to roll (R2R) system was used to fabricate polysulfone (PSf)…

Subjects/Keywords: Polymeric Membranes; Bio-derived solvent; Non-solvent induced phase separation; Membrane fabrication; Scaleup; Membrane Science; Polymer Science

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

APA (6^th Edition):

Dong, X. (2020). A THERMODYNAMIC AND FEASIBILITY STUDY OF GREEN SOLVENTS FOR THE FABRICATION OF WATER TREATMENT MEMBRANES. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cme_etds/124

Chicago Manual of Style (16^th Edition):

Dong, Xiaobo. “A THERMODYNAMIC AND FEASIBILITY STUDY OF GREEN SOLVENTS FOR THE FABRICATION OF WATER TREATMENT MEMBRANES.” 2020. Doctoral Dissertation, University of Kentucky. Accessed January 18, 2021. https://uknowledge.uky.edu/cme_etds/124.

MLA Handbook (7^th Edition):

Dong, Xiaobo. “A THERMODYNAMIC AND FEASIBILITY STUDY OF GREEN SOLVENTS FOR THE FABRICATION OF WATER TREATMENT MEMBRANES.” 2020. Web. 18 Jan 2021.

Vancouver:

Dong X. A THERMODYNAMIC AND FEASIBILITY STUDY OF GREEN SOLVENTS FOR THE FABRICATION OF WATER TREATMENT MEMBRANES. [Internet] [Doctoral dissertation]. University of Kentucky; 2020. [cited 2021 Jan 18]. Available from: https://uknowledge.uky.edu/cme_etds/124.

Council of Science Editors:

Dong X. A THERMODYNAMIC AND FEASIBILITY STUDY OF GREEN SOLVENTS FOR THE FABRICATION OF WATER TREATMENT MEMBRANES. [Doctoral Dissertation]. University of Kentucky; 2020. Available from: https://uknowledge.uky.edu/cme_etds/124

University of Kentucky

22. Tomaino, Andrew R. Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis.

Degree: 2014, University of Kentucky

URL: https://uknowledge.uky.edu/cme_etds/38

► While considerable progress has been made towards understanding the effect that membrane-based layer-by-layer (LbL) immobilizations have on the activity and stability of enzymatic catalysis, detailed… (more)

Subjects/Keywords: Layer-by-layer; microfiltration; membrane; enzyme immobilization; enzymatic catalysis.; Catalysis and Reaction Engineering; Membrane Science; Polymer Science

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APA (6^th Edition):

Tomaino, A. R. (2014). Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis. (Masters Thesis). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cme_etds/38

Chicago Manual of Style (16^th Edition):

Tomaino, Andrew R. “Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis.” 2014. Masters Thesis, University of Kentucky. Accessed January 18, 2021. https://uknowledge.uky.edu/cme_etds/38.

MLA Handbook (7^th Edition):

Tomaino, Andrew R. “Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis.” 2014. Web. 18 Jan 2021.

Vancouver:

Tomaino AR. Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis. [Internet] [Masters thesis]. University of Kentucky; 2014. [cited 2021 Jan 18]. Available from: https://uknowledge.uky.edu/cme_etds/38.

Council of Science Editors:

Tomaino AR. Layer-by-Layer Assemblies for Membrane-Based Enzymatic Catalysis. [Masters Thesis]. University of Kentucky; 2014. Available from: https://uknowledge.uky.edu/cme_etds/38

UCLA

23. Jun, Dukwoo. Mechanisms of biofoulant-membrane interactions for ultrafiltration and microfiltration membranes.

Degree: Civil Engineering, 2016, UCLA

URL: http://www.escholarship.org/uc/item/0tj6z5b1

► Since the majority of biofouling occurs on the surface of the polymeric membranes, key interfacial interactions between a membrane surface and a biofoulant play a… (more)

▼ Since the majority of biofouling occurs on the surface of the polymeric membranes, key interfacial interactions between a membrane surface and a biofoulant play a pivotal role in biofouling phenomena. In thermodynamic perspective, biofouling can be interpreted as adhesion of two different entities, a biofoulant and a membrane, through a media, (herein, water), to be a combined column. Therefore, adhesion accompanies a structural change of interfaces existing in the aqueous system. This interface-transitive nature of biofouling phenomena leads that surface tension-based theories are adopted in the fundamental understanding of the membrane biofouling. Among those theories, the van Oss approach has been considered prominent because of its satisfactory prediction for experimental results of biofouling tests. According to van Oss approach, in aqueous media, Lewis acid-base interaction occurs between the electron-acceptor in hydrogen atoms of water and lone pairs of atoms of a solid, basically having an analogous concept with hydrogen-bonding. The membrane surface with polar properties is able to hold water molecules and form a hydration cell layer on its surface, which may impede the access of biofoulant to the membrane surface. Because the biofoulant also has the electron-donating and accepting potentials, other interfacial interactions also occur in biofoulant-water and biofoulant–membrane surface. Therefore, better thermodynamic understanding on the biofouling phenomena need a perspective that ponders the three different but deeply interconnected interfacial interactions existing in membrane-water, water-biofoulant and biofoulant-membrane. The purpose of this dissertation is to investigate the biofouling phenomena in the molecular basis that can qualitatively and quantitatively evaluate the roles of physicochemical properties of water, membranes and biofoulants in biofoulant-membrane interaction for aqueous system. First, this study investigated the water-membrane interaction in terms of surface tension properties of a membrane and their discrete interactions with water in Chapter 2. This chapter simulated the available surface tension parameters of polymeric porous membranes using different presumptions on polar properties of water and evaluates the effect of each surface tension parameter of a membrane on water-membrane interactions. The simulated libraries of surface tension parameters revealed that polymeric porous membranes highly tend to fall into a category of electron-donor monopolar or semi-monopolar solids. The high electron-accepticity of water emphasized the role of electron-doicity of a membrane in the interfacial interaction between a membrane and water and caused the polar adhesion between electron-donor sites of a membrane and electron-acceptor sites of water to be a major interaction component than other components. The high Lewis acidity of water highlighted the role of electron-donicity of a membrane in its wettability as well. A higher electron-donicity of a membrane has little impact on the total…

Subjects/Keywords: Environmental science; Biofouling resistant membrane; Electron-donicity; Hydrophilicity; Interfacial interaction

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APA (6^th Edition):

Jun, D. (2016). Mechanisms of biofoulant-membrane interactions for ultrafiltration and microfiltration membranes. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/0tj6z5b1

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):

Jun, Dukwoo. “Mechanisms of biofoulant-membrane interactions for ultrafiltration and microfiltration membranes.” 2016. Thesis, UCLA. Accessed January 18, 2021. http://www.escholarship.org/uc/item/0tj6z5b1.

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

MLA Handbook (7^th Edition):

Jun, Dukwoo. “Mechanisms of biofoulant-membrane interactions for ultrafiltration and microfiltration membranes.” 2016. Web. 18 Jan 2021.

Vancouver:

Jun D. Mechanisms of biofoulant-membrane interactions for ultrafiltration and microfiltration membranes. [Internet] [Thesis]. UCLA; 2016. [cited 2021 Jan 18]. Available from: http://www.escholarship.org/uc/item/0tj6z5b1.

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

Council of Science Editors:

Jun D. Mechanisms of biofoulant-membrane interactions for ultrafiltration and microfiltration membranes. [Thesis]. UCLA; 2016. Available from: http://www.escholarship.org/uc/item/0tj6z5b1

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

University of California – San Diego

24. Kim, Young Jin. Synthesis and investigation of nanostructured particles and membranes for energy-related applications.

Degree: Materials Sci and Engineering, 2016, University of California – San Diego

URL: http://www.escholarship.org/uc/item/3w56c63q

► Nanostructured materials exhibit useful properties that are not found in the same materials in bulk form. (1) Dramatically increase surface and area and roughness of… (more)

▼ Nanostructured materials exhibit useful properties that are not found in the same materials in bulk form. (1) Dramatically increase surface and area and roughness of nanostructured materials is advantageous for evaporative cooling, which is one of the main subjects in this dissertating, due to the strong capillary effect and high density of gas-liquid-solid triple junctions. (2) In magnetic materials, when the size of the magnetic material is decreased to submicron or nano size, magnetic coercivity increases since magnetic domains are confined by the size of the material. (3) Also, unique optical properties of materials in nano size can be utilized for thermal managing and energy saving application. In Chapter 2 of this dissertation, I described the demonstration of using nanoporous membranes in evaporative cooling. Nanoporous membranes have been proposed and theoretically shown as a promising candidate for high heat flux evaporative heat transfer. However, the experimentally demonstrated heat flux has so far been significantly lower than the theoretical prediction, which has cast doubt on the feasibility of achieving a high heat flux from nanoporous membranes. Here we carried out evaporative heat transfer experiments using isopropyl alcohol (IPA) through anodized aluminum oxide (AAO) membranes. For membranes with a 200nm average pore size on a 0.5cm2 size area, we demonstrated a high evaporative heat flux of 210W/cm2 based on the overall AAO surface area, or ~400W/cm2 if only the pore area is considered. This heat flux is close to the theoretical value of 572 W/cm² (based on the pore area) for IPA evaporation through nanoporous membranes. Using time synchronized high-speed images, it was verified that evaporation was the main heat transfer mode in the high heat flux regime. The demonstration of high heat flux evaporation through nanoporous membranes, close to the theoretical limit and on a relatively large area (0.5cm2), is significant for the future development of high heat flux thermal management technology for electronic devices.In chapter 3, I presented a noble technique to achieve exchange coupling of hard phase magnetic materials and soft phase magnetic materials. Exchange coupled spring magnets have been suggested as a possible replacement of rare earth contained strong magnets. We have chosen LPT-MnBi as hard phase and FeCo as soft phase magnetic material, as many early conducted theoretical modeling suggests. The optimal size of hard phase magnet for the exchange coupling (approximately twice of single magnetic domain size, ~2µm for MnBi) was achieved by conventional ball milling process, and the shell layer of FeCo was deposited by a noble process called sonic agitation assisted physical vapor deposition (SAA-PVD). TEM image and EDX mapping shows uniform coating of FeCo outer shell layer on the MnBi core. The thickness of the shell layer was in the range of 10~35nm which is slightly less than twice of single domain size of FeCo. Magnetic remanence of ball milled MnBi particles was increased from Ms = 36…

Subjects/Keywords: Materials Science; energy; membrane; nano; particles; thermal management

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

APA (6^th Edition):

Kim, Y. J. (2016). Synthesis and investigation of nanostructured particles and membranes for energy-related applications. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/3w56c63q

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):

Kim, Young Jin. “Synthesis and investigation of nanostructured particles and membranes for energy-related applications.” 2016. Thesis, University of California – San Diego. Accessed January 18, 2021. http://www.escholarship.org/uc/item/3w56c63q.

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

MLA Handbook (7^th Edition):

Kim, Young Jin. “Synthesis and investigation of nanostructured particles and membranes for energy-related applications.” 2016. Web. 18 Jan 2021.

Vancouver:

Kim YJ. Synthesis and investigation of nanostructured particles and membranes for energy-related applications. [Internet] [Thesis]. University of California – San Diego; 2016. [cited 2021 Jan 18]. Available from: http://www.escholarship.org/uc/item/3w56c63q.

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

Council of Science Editors:

Kim YJ. Synthesis and investigation of nanostructured particles and membranes for energy-related applications. [Thesis]. University of California – San Diego; 2016. Available from: http://www.escholarship.org/uc/item/3w56c63q

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

University of California – Irvine

25. Eaton, Jeremy Martin. Particle Size and Frequency Dependent Folding in Langmuir Monolayers.

Degree: Physics, 2016, University of California – Irvine

URL: http://www.escholarship.org/uc/item/867633kz

► Langmuir monolayers, single molecule-thick rafts of surfactant molecules at the air-waterinterface, are of great interest due to their similarity to the surfactant system present in… (more)

Subjects/Keywords: Biophysics; Physics; Materials Science; alveoli; folding; membrane; monolayer; particulates; surfactant

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APA (6^th Edition):

Eaton, J. M. (2016). Particle Size and Frequency Dependent Folding in Langmuir Monolayers. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/867633kz

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):

Eaton, Jeremy Martin. “Particle Size and Frequency Dependent Folding in Langmuir Monolayers.” 2016. Thesis, University of California – Irvine. Accessed January 18, 2021. http://www.escholarship.org/uc/item/867633kz.

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

MLA Handbook (7^th Edition):

Eaton, Jeremy Martin. “Particle Size and Frequency Dependent Folding in Langmuir Monolayers.” 2016. Web. 18 Jan 2021.

Vancouver:

Eaton JM. Particle Size and Frequency Dependent Folding in Langmuir Monolayers. [Internet] [Thesis]. University of California – Irvine; 2016. [cited 2021 Jan 18]. Available from: http://www.escholarship.org/uc/item/867633kz.

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

Council of Science Editors:

Eaton JM. Particle Size and Frequency Dependent Folding in Langmuir Monolayers. [Thesis]. University of California – Irvine; 2016. Available from: http://www.escholarship.org/uc/item/867633kz

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

University of California – Berkeley

26. Zhang, Chen. Sub-nanometer Porous Membrane Based on Cyclic Peptide-Polymer Conjugate and Block Copolymer.

Degree: Materials Science & Engineering, 2015, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/9hb6f82f

► Membrane separation is a field of both industrial and academic importance. Current technology is largely based on polymeric materials, and to a less extent other… (more)

▼ Membrane separation is a field of both industrial and academic importance. Current technology is largely based on polymeric materials, and to a less extent other inorganic materials such as ceramics and metals. While developments in materials properties and membrane structures are constantly evolving, there are two challenges that need to be circumvented for better performance, i.e. the control over the pore structure and the chemical flexibility in modifying pore surface. “Bottom-up” approach to construct composite membranes using nanotubes in polymeric matrix is an effective route in fabricating membranes with well-defined architecture and tunable pore surface chemistry. This dissertation focuses on characterization and evaluation of cyclic peptide nanotubes (CPNs), a natural protein channel mimetic, in constructing sub-nanometer composite membranes with a cylinder-forming block copolymer (BCP) matrix in thin films. The fundamental understanding of the self-assembly of the CPNs from the building blocks establishes the foundation in utilizing the unique feature of CPNs to ensure precise structural control over the dimensions of the 1D nanotubes. The knowledge gained from the co-assembly of CPNs and BCP matrix in thin films allows further processing of the nanotubes to form well-aligned transport channels, establishing the guidelines in fabricating sub-nanometer porous membranes with and without surface chemistry modification. By identifying the key parameters in the membrane fabrication processes, design features for creating high-performance CPN based membranes can be determined and expanded. This indeed provides many exciting opportunities in developing new composite membranes with superior separation performances.The self-assembly of cyclic peptide (CP) subunits forming high aspect ratio nanotubes is driven by strong intermolecular hydrogen bonding. To modulate and tune the growth of CPNs, polymers are conjugated to the exterior of the peptide subunits, resulting in the formation of polymer covered-CPNs (pc-CPNs). Due to the restriction of intermolecular hydrogen bonding, the conjugated polymer chains enter a confined space set by the hydrogen bonding distance. The entropic penalty associated with deforming the conjugated polymers serves as an opposing force destabilizes nanotube structure, while the enthalpic hydrogen bonding drives the nanotube formation. A delicate balance between the enthalpic driving force and the entropic destabilizing force enables one to modulate the growth of the nanotubes. Thus, the dimensions of the resultant pc-CPNs can be supervised simply by regulating the extent of the entropic penalty from the conjugated polymer chains. In co-assembling CPNs and BCP matrix in thin films, both thermodynamic and kinetic parameters are critical to ensure homogeneous thin film morphology with well-aligned CPN channels at the center of the cylindrical microdomains of the BCP oriented normal to the substrate surface. The balance between the enthalpic interactions between the pc-CPNs and BCP and the…

Subjects/Keywords: Materials Science; block copolymer; membrane; nanotube; peptide-polymer conjugate

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APA (6^th Edition):

Zhang, C. (2015). Sub-nanometer Porous Membrane Based on Cyclic Peptide-Polymer Conjugate and Block Copolymer. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/9hb6f82f

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):

Zhang, Chen. “Sub-nanometer Porous Membrane Based on Cyclic Peptide-Polymer Conjugate and Block Copolymer.” 2015. Thesis, University of California – Berkeley. Accessed January 18, 2021. http://www.escholarship.org/uc/item/9hb6f82f.

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

MLA Handbook (7^th Edition):

Zhang, Chen. “Sub-nanometer Porous Membrane Based on Cyclic Peptide-Polymer Conjugate and Block Copolymer.” 2015. Web. 18 Jan 2021.

Vancouver:

Zhang C. Sub-nanometer Porous Membrane Based on Cyclic Peptide-Polymer Conjugate and Block Copolymer. [Internet] [Thesis]. University of California – Berkeley; 2015. [cited 2021 Jan 18]. Available from: http://www.escholarship.org/uc/item/9hb6f82f.

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

Council of Science Editors:

Zhang C. Sub-nanometer Porous Membrane Based on Cyclic Peptide-Polymer Conjugate and Block Copolymer. [Thesis]. University of California – Berkeley; 2015. Available from: http://www.escholarship.org/uc/item/9hb6f82f

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

University of California – Berkeley

27. Clark, Kyle Tyler. Improved Fuel Transport Selectivity in Polymer Electrolyte Membranes.

Degree: Materials Science & Engineering, 2014, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/5sr8h5px

► In polymer electrolyte membrane (PEM) fuel cells, fuel crossover through the membrane is a significant problem that contributes to reduction in cell efficiency and accelerated… (more)

Subjects/Keywords: Materials Science; Fuel Cells; Polymer Electrolyte Membrane; Transport Phenomena

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APA (6^th Edition):

Clark, K. T. (2014). Improved Fuel Transport Selectivity in Polymer Electrolyte Membranes. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/5sr8h5px

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):

Clark, Kyle Tyler. “Improved Fuel Transport Selectivity in Polymer Electrolyte Membranes.” 2014. Thesis, University of California – Berkeley. Accessed January 18, 2021. http://www.escholarship.org/uc/item/5sr8h5px.

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

MLA Handbook (7^th Edition):

Clark, Kyle Tyler. “Improved Fuel Transport Selectivity in Polymer Electrolyte Membranes.” 2014. Web. 18 Jan 2021.

Vancouver:

Clark KT. Improved Fuel Transport Selectivity in Polymer Electrolyte Membranes. [Internet] [Thesis]. University of California – Berkeley; 2014. [cited 2021 Jan 18]. Available from: http://www.escholarship.org/uc/item/5sr8h5px.

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

Council of Science Editors:

Clark KT. Improved Fuel Transport Selectivity in Polymer Electrolyte Membranes. [Thesis]. University of California – Berkeley; 2014. Available from: http://www.escholarship.org/uc/item/5sr8h5px

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

28. Inlora, Jingga. The Roles of Lipid and RNA in Regulating Retroviral Gag Membrane Binding and Targeting.

Degree: PhD, Microbiology and Immunology, 2015, University of Michigan

URL: http://hdl.handle.net/2027.42/113324

► The HIV-1 matrix (MA) domain mediates proper Gag localization and membrane binding by interacting with phosphatidylinositol-4,5-bisphosphate [PI(4,5)P2], a plasma membrane(PM)-specific phospholipid. HIV-1 MA also interacts… (more)

▼ The HIV-1 matrix (MA) domain mediates proper Gag localization and membrane binding by interacting with phosphatidylinositol-4,5-bisphosphate [PI(4,5)P2], a plasma membrane(PM)-specific phospholipid. HIV-1 MA also interacts with RNA, which prevents Gag from binding to membranes containing phosphatidylserine (PS), a prevalent negatively charged phospholipid. These results suggest that the MA-bound RNA promotes PM-specific localization of HIV-1 Gag by blocking non-specific interactions with membranes that do not contain PI(4,5)P2. In this thesis, I examined whether PI(4,5)P2 dependence and RNA-mediated inhibition collectively determine MA phenotypes across a broad range of retroviruses. By comparing a panel of Gag-leucine-zipper constructs (GagLZ) containing MA of different retroviruses, I found that membrane binding mediated by retroviral MA can be broadly divided into two categories: those that are PI(4,5)P2-dependent and RNase responsive, and those that are neither. I also found that the PM-localization and virus-like particles (VLP) release of the former group is sensitive to the overexpression of a PI(4,5)P2- depleting enzyme, polyphosphoinositide 5-phosphatase IV (5ptaseIV), while the latter group is much less sensitive to 5ptaseIV overexpression. Structural analyses further suggest that the basic patch size of the retroviral MA confer susceptibility to RNA-mediated membrane binding inhibition. In my thesis, I also provided in vitro and cell-based evidence supporting that RNA-mediated suppression occurs in cells and that RNA can inhibit membrane binding of HIV-1 Gag at a concentration that is much lower than the estimated RNA concentration in the cell. Hence, RNA-mediated suppression is a physiologically relevant mechanism that prevents Gag from binding promiscuously to prevalent PS-containing membranes. Finally, I examined the roles of PI(4,5)P2 and RNA in regulating the targeting of HIV-1 Gag to the site of assembly, the virus-containing compartments (VCC), in primary macrophages. I found that the VCC localization and virus release of HIV-1 are severely impaired upon 5ptaseIV overexpression. However, HIV-1 MA contributes only to membrane binding but not in Gag targeting to the VCC. I also determined that HIV-1 nucleocapsid (NC) is important for VCC-specific localization of HIV-1 Gag. This suggests that targeting of HIV-1 Gag to the VCC adopts a different mechanism than Gag targeting to the PM in HeLa and T cells. Advisors/Committee Members: Ono, Akira (committee member), Tai, Andrew W. (committee member), Telesnitsky, Alice (committee member), Swanson, Joel A. (committee member), Tsai, Billy (committee member).

Subjects/Keywords: Retroviruses; RNA; Phospholipids; Membrane binding; Microbiology and Immunology; Science

11 more images…

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

APA (6^th Edition):

Inlora, J. (2015). The Roles of Lipid and RNA in Regulating Retroviral Gag Membrane Binding and Targeting. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/113324

Chicago Manual of Style (16^th Edition):

Inlora, Jingga. “The Roles of Lipid and RNA in Regulating Retroviral Gag Membrane Binding and Targeting.” 2015. Doctoral Dissertation, University of Michigan. Accessed January 18, 2021. http://hdl.handle.net/2027.42/113324.

MLA Handbook (7^th Edition):

Inlora, Jingga. “The Roles of Lipid and RNA in Regulating Retroviral Gag Membrane Binding and Targeting.” 2015. Web. 18 Jan 2021.

Vancouver:

Inlora J. The Roles of Lipid and RNA in Regulating Retroviral Gag Membrane Binding and Targeting. [Internet] [Doctoral dissertation]. University of Michigan; 2015. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/2027.42/113324.

Council of Science Editors:

Inlora J. The Roles of Lipid and RNA in Regulating Retroviral Gag Membrane Binding and Targeting. [Doctoral Dissertation]. University of Michigan; 2015. Available from: http://hdl.handle.net/2027.42/113324

University of Michigan

29. Dupzyk, Allison. Mechanism of Membrane Penetration by Nonenveloped Polyomavirus and Papillomavirus.

Degree: PhD, Microbiology & Immunology, 2019, University of Michigan

URL: http://hdl.handle.net/2027.42/149876

► Membrane penetration represents a critical step during virus infection. As nonenveloped viruses lack a surrounding lipid bilayer, they are unable to penetrate host membranes by… (more)

▼ Membrane penetration represents a critical step during virus infection. As nonenveloped viruses lack a surrounding lipid bilayer, they are unable to penetrate host membranes by a membrane fusion mechanism. Consequently, nonenveloped viruses must devise alternative strategies to enter the host cell. In the case of polyomavirus SV40 and human papillomavirus (HPV), these two nonenveloped DNA tumor viruses must hijack selective host factors in order to promote their membrane penetration. Upon endocytosis, SV40 traffics through the endosomal pathway to reach the endoplasmic reticulum (ER). Here the virion is inserted into the ER membrane and is extracted into the cytosol by the cytosolic extraction machinery composed of the Hsc70, SGTA, and Hsp105 chaperones. From the cytosol, the virus is transported into the nucleus to cause infection. My thesis work unambiguously identified Hsc70 as a critical component of the cytosolic extraction machinery that ejects SV40 from the ER into the cytosol, clarified the structure-function relationship of SGTA during this process, and unveiled SGTA’s ability to negatively regulate Hsc70’s action during this the ER-to-cytosol membrane transport step. Moreover, my studies revealed that the Bag2 nucleotide exchange factor (NEF) is a new component of the cytosolic extraction machinery. In this context, Bag2 stimulates SV40 release from Hsc70, promoting successful arrival of SV40 to the cytosol, leading to infection. Collectively, my findings identify a novel component of a cytosolic extraction machinery essential during membrane penetration of a nonenveloped virus, and provide further mechanistic insights into this process. Similar to SV40, HPV membrane penetration requires host factors that are poorly characterized. After initial entry, HPV reaches the endosome, where the viral L2 minor capsid protein is inserted into the endosomal membrane. Membrane insertion of L2 is a decisive event because this step recruits the cytosolic sorting retromer complex to endosome-localized HPV, which in turn directs the virus to the Golgi apparatus. From this compartment, the virus enters the nucleus during mitosis where viral DNA is replicated. Through classic biochemical analyses, we recently reported that the transmembrane protease gamma secretase acts as a novel chaperone that binds to and inserts L2 into the endosomal membrane, an essential HPV infection step. In this thesis, we now identify the gamma secretase-binding partner delta-catenin/p120 as a new host factor that interacts with L2 and promotes HPV infection. Our analysis further suggests a model in which p120 engages HPV early in infection, delivering the virus to gamma secretase so that HPV can properly insert into the endosome membrane. In sum, my results provide fundamental insights into the infectious entry pathway of the nonenveloped SV40 and HPV by illuminating their membrane penetration mechanism. Advisors/Committee Members: Tsai, Billy (committee member), Fingar, Diane C (committee member), Imperiale, Michael J (committee member), Spindler, Katherine (committee member).

Subjects/Keywords: Nonenveloped virus membrane penetration; Microbiology and Immunology; Science

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

APA (6^th Edition):

Dupzyk, A. (2019). Mechanism of Membrane Penetration by Nonenveloped Polyomavirus and Papillomavirus. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/149876

Chicago Manual of Style (16^th Edition):

Dupzyk, Allison. “Mechanism of Membrane Penetration by Nonenveloped Polyomavirus and Papillomavirus.” 2019. Doctoral Dissertation, University of Michigan. Accessed January 18, 2021. http://hdl.handle.net/2027.42/149876.

MLA Handbook (7^th Edition):

Dupzyk, Allison. “Mechanism of Membrane Penetration by Nonenveloped Polyomavirus and Papillomavirus.” 2019. Web. 18 Jan 2021.

Vancouver:

Dupzyk A. Mechanism of Membrane Penetration by Nonenveloped Polyomavirus and Papillomavirus. [Internet] [Doctoral dissertation]. University of Michigan; 2019. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/2027.42/149876.

Council of Science Editors:

Dupzyk A. Mechanism of Membrane Penetration by Nonenveloped Polyomavirus and Papillomavirus. [Doctoral Dissertation]. University of Michigan; 2019. Available from: http://hdl.handle.net/2027.42/149876

Jawaharlal Nehru University

30. Mishra, Prashant. Lipids in the structure and function of yeast membrane; -.

Degree: Life Sciences, 1988, Jawaharlal Nehru University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/16306

None

Appendix p.108-109, Reference 82-107

Advisors/Committee Members: Prasad, Rajendra.

Subjects/Keywords: Life Science; Lipids; yeast membrane

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APA (6^th Edition):

Mishra, P. (1988). Lipids in the structure and function of yeast membrane; -. (Thesis). Jawaharlal Nehru University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/16306

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):

Mishra, Prashant. “Lipids in the structure and function of yeast membrane; -.” 1988. Thesis, Jawaharlal Nehru University. Accessed January 18, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/16306.

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

MLA Handbook (7^th Edition):

Mishra, Prashant. “Lipids in the structure and function of yeast membrane; -.” 1988. Web. 18 Jan 2021.

Vancouver:

Mishra P. Lipids in the structure and function of yeast membrane; -. [Internet] [Thesis]. Jawaharlal Nehru University; 1988. [cited 2021 Jan 18]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/16306.

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

Council of Science Editors:

Mishra P. Lipids in the structure and function of yeast membrane; -. [Thesis]. Jawaharlal Nehru University; 1988. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/16306

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

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Open Access Theses and Dissertations