Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"membrane morphology"”.
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Spatial and temporal control of lipid-membrane morphology induced by sphingomyelinase
… the cellular processes by reorganizing the cell membrane morphology. This thesis aims at a more comprehensive understanding of how sphingomyelinase (SMase) can regulate lipid membrane heterogeneity. We develop corralled model raft membranes in a microfluidic device to study the complex phase …
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Light-induced transformations in biomembranes
Cellular membranes constantly experience remodeling, as exemplified by morphological changes during endo- and exocytosis. Regulation of membrane morphology is essential for these processes. In this work, we attempt to establish a regulation path based on the use of photoswitches exhibiting …
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Advancing hydrophobic desalination membranes using initiated chemical vapor deposition (iCVD) v/
Hydrophobic membranes are the central component of membrane distillation (MD) desalination systems. Optimizing their design is crucial for efficient desalination. There are many requirements on MD membranes. These include high liquid entry pressure (LEP) and high permeability to water vapor. There …
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Simulations of polymeric membrane formation in 2D and 3D
… process makes most commercial polymeric membranes, which enjoy widespread use in water filtration and purification. In this work, a ternary Cahn-Hilliard formulation incorporating a Flory-Huggins homogeneous free energy function is used to model both initial diffusion and the …
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Multiscale Tortuous Diffusion in Anion- and Cation-Exchange Membranes: Exploration of Counterions, Water Content, and Polymer Functionality
Fundamental understanding of water transport and morphology is critical for improving ion conductivity in polymer electrolyte membranes (PEMs). Herein, we present comprehensive water transport measurements comparing anion-exchange membranes (AEMs) based on ammonium-functionalized poly(phenylene …
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Shaping of membranes by arc-like particles
This dissertation analyzes the interaction of biomembranes with arc-like particles, which gives rise to complex morphologies of organelles inside cells. The shaping of membranes is investigated with coarse-grained modeling and Monte Carlo simulations. In the coarse-grained model, the membrane is …
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Optimizing the structure and plasticization resistance of asymmetric polyimide hollow fiber membranes for CO2 removal from natural gas
Polymeric membrane has been recognized as an energy efficient and economical approach for many industrial gas separation applications, including natural gas purification. Matrimid 5218® has been used as a benchmark polymer, due to its combination of high selectivity and acceptable permeance, as …
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Advances in volumetric super-resolution microscopy and single-particle tracking
… enrichment of the PD-1 receptor relative to the membrane morphology of T cells. Chapter 6 applies SMLFM in a single-particle tracking modality to quantify the diffusive states of Golgi-localised proteins, RAB6 and ACBD3, and reports on a biophysical investigation into the effect of transmembrane …
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The influence of biosynthesis zinc oxide nanoparticles by using fruit extracts of ananas comosus towards the performance of PSF/ZNO membrane
… The main key of this work is to enhance membrane performance permeability, rejection, anti-fouling and antibacterial activity. This study seeks to discover the influenced of biosynthesis of Zinc Oxide (ZnO) nanoparticles by using fruits extracts of Ananas Comosus towards the …
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Self-assembled Precipitation Membranes and the Implications for Natural Sciences
… precipitation reactions can generate complex membrane structures. Such membranes are of great research interest in fields ranging from chemical engineering to geophysics, and even biology where they are thought to have played a vital role in the origin of life. Usually, the transport of …
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Characterization of polymeric membranes: sulfonated polysulfones
… for use as a reverse osmosis desalination membrane. In this work, an extensive of dense membranes made from sulfonated polysulfone having 0.2, 0.4, 0.5, 0.6, 0.8, and 1.0 degree of sulfonation is described. The degree of sulfonation (D.S.) was maintained during the membrane fabrication …
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The missing dimension of cell membrane organization. Study on cubic membrane structure and function
Membranes are of fundamental importance for biological systems. They provide for cellular compartmentalization and control of the internal cell environment. The biophysical properties of the membrane lipids and proteins play a key role in determining the membrane morphology and geometry. Far from …
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Fibrous Membranes in Personal Protective Applications
… filters in respirators and face masks, fibrous membranes can act as excellent barriers to aerosols without resulting in unreasonably high air resistance. The application of strong and tough fibrous textiles in protective clothing has continued to grow since the 1970s, replacing traditional metal …
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Use of polymeric membranes for the treatment of oily wastewater: Modification using inorganic nanoparticles and optimization of filtration parameters
Polymeric membranes have proven to be an effective method for the treatment of contaminated waters. Many factors influence their performances including the operating parameters, fabrication process and conditions, and modifications using different additives. Introduced as additives, nanoparticles …
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Mathematical modeling of membrane filtration
… and investigate new mathematical models for membrane filtration. The work presented is divided into six chapters. In the first chapter the problem is introduced and motivated. In the second chapter, a new mathematical model for flow and fouling in a pleated membrane filter is presented. …
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Cross-Flow Filtration with Mixed Matrix Membranes for the Removal of Proteins from White Wines
… via the use of bentonite-embedded mixed matrix membranes (MMM) in cross-flow filtration systems. This process aims to reduce the processing time and reduce or eliminate the generation of bentonite lees. While protein adsorber membranes made using the wet phase inversion technique had been …
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Regulatory Mechanisms of Mitotic Catastrophe Induced by Doxorubicin
… II, free radical generation, or damage to cell membranes and induce apoptosis, senescence or mitotic catastrophe. Because low dose of doxorubicin induce senescence or mitotic cell death, we attempted to investigate the possible link between the drug-induced senescence and mitotic cell death as …
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The Biophysical Role of the Cellular Glycocalyx: Engineering Glycoproteins to Control Cell-Surface Properties
… polymer brush theory to develop a model for membrane bending driven by glyco-biopolymers. Finally, we investigate what role the anti-adhesive glycocalyx may play in regulating cellular migration both in vitro and in vivo. Together, these projects utilize engineered glycoproteins to elucidate …
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Investigation of Phase Morphology and Blend Stability in Ionomeric Perfluorocyclobutane (PFCB)/Poly(vinylidene difluoride) (PVDF) Copolymer Blend Membranes
… is focused on the investigation of phase morphology and blend stability within ionomeric perfluorocyclobutane (PFCB)/poly(vinylidene difluoride) (PVDF) copolymer blend membranes. The morphologies of these unique materials, designed as proton exchange membranes (PEMs) for proton exchange …
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Surface modification of polymer membranes by self-organization
Water filtration processes employing polymer membranes have become increasingly important over the past forty years. Due to their high efficiency and modularity relative to conventional processes, membrane separations are among a suite of emerging water treatment technologies which will make …
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