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Showing 1 to 17 of 17 for “"filtration membranes"”.
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Improved filtration membranes through self-organizing amphiphilic comb copolymers
The operating cost of a membrane filtration system is generally determined by two major factors: the permeability of the membrane to water, and the lifetime of the membrane. Both of these are strongly affected by the chemical structure and surface properties of the membrane. Hence, the development …
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Design of chemistry and morphology of polymer filtration membranes
To improve membrane materials in water filtration, which currently display broad pore size distribution, hydrophobic chemistry, and fouling behavior, a novel design of chemistry and morphology of membranes is employed. First, through fundamental studies of morphological formation both in bulk by …
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Layer by Layer, Nano-particle "Only" Surface Modification of Filtration Membranes
… for the modification of polymeric micro and ultrafiltration (MF/UF) membranes to produce thin film composites (TFC) with potential nanofiltration (NF) and reverse osmosis (RO) capabilities.. A variety of porous substrate membranes with different membrane surface characteristics are employed, but …
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Self-healing properties of water filtration membranes containing amphiphilic comb polymer
(cont.) and filtration experiments, as well as other characterization techniques. Surface analysis is accomplished via x-ray photoelectron spectroscopy (XPS). Membrane samples are cleaned (in hydrogen peroxide or chromic-sulfuric acid (Chromerge)) and/or annealed (in 90⁰C deionized water), and …
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I. Depolymerization-macrocyclization of (o-phenylene-ethynylene)-alt-(arylene-ethynylene) copolymers II. Improving existing water filtration membranes via covalent modification
… distribution. II. Improving Existing Water Filtration Membranes via Covalent Modification Over a billion people in the world already have limited access to safe drinking water, and the problem is steadily growing worse due to contamination of our water supply. Therefore, we need an …
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Block copolymer self-assembly and templating strategies
… applications in microelectronics, photovoltaics, filtration membranes and other devices.
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Surface Directed Monoclonal Antibodies against STEC Aid in the Reduction of Pathogen Detection Times from Food and Water
… hrs), two approaches were considered: (1) the filtration of enrichment culture through a gradient of filtration membranes (decreasing pore sizes), followed by capture using specific monoclonal antibody (mAb)-coated Dynabeads, and detection via fluorescence microscopy, (2) the addition of …
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Investigation into obstacles to the implementation of the directed-self assembly of block copolymers
… in applications such as photonic crystals and filtration membranes as well as in discerning the relationship between defect annihilation rates and X. PtBS-b-PHEMA is a new high X BCP that has shown via SAXS profiles to be able to phase separate into features with a sub-7 nm pitch.
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Fabrication, assembly, and electrical characterisation of gold nanowire
… of gold nanowires. Porous alumina membranes have been electrochemically fabricated as templates for the deposition of gold nanowires. They consist of a thick oxide membrane, shown to be perforated by a high density array of isolated cylindrical pores, with a narrow size …
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Quantifying uncertainty in pathogen removal, membrane integrity monitoring and health consequences in the treatment of drinking water
… of oocysts of Cryptosporidium and viruses in membranes used to treat drinking water. In chapter 2, we examined variability and uncertainty in the determination of parameters used in pressure-based direct integrity tests of hollow fiber micro- and ultra-filtration membranes. We found that …
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Carbon nanosheets and their applications
… microscopy (TEM) grids, large freestanding membranes with the thickness of one monolayer were obtained with an aspect ratio of up to 1:225000. This way, for the first time, the bottom side of the nanosheet became accessible for functionalization, and it was possible to selectively couple …
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Interaction between membrane and protein properties on flux decline during sterile microfiltration
Microfiltration is widely used in industry to filter out particulate matter that contaminates or slows down the performance of the membrane. In the biopharmaceutical industry in particular, bacteria, microorganisms and viruses are filtered out using sterile microfiltration. Numerous studies have …
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Porous Graded Materials Derived From Block Copolymer Self-Assembly For Water And Energy Applications
… in thickness. It has been utilized to make ultrafiltration membranes for water treatment and selective separation. In the first part, further development on SNIPS polymeric membranes is discussed. In situ grazing incidence small-angle X-ray scattering (GISAXS) was employed to study the structure …
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Application of the Vortex Fluid Device (VFD) in Polysulfone Synthesis and Ultra-filtration Membrane Fabrication for water treatment purposes
… have been performed to improve key properties of filtration membranes via controlling the fabrication process conditions as well as physical and/or chemical modification of the polymers used in membrane fabrication. The Vortex Fluid Device (VFD) is a newly invented platform which has found many …
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Structured polymer thin films: self-assembly and forced-assembly
… (PDMS)/GO composite thin film membranes formed using a forced-assembly solution-casting method which induced the orientation of GO fillers, resulting in remarkable gas barrier and separation properties at GO concentrations around 5 wt% and higher. This thesis explores the effect …
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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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Control of size and charge selectivity in amphiphilic graft copolymer nanofiltration membranes
… efficiency of membrane separations make polymer filtration membranes an important resource for the pharmaceutical, food and wastewater treatment industries. Nanofiltration (NF) membranes fill an important niche between nonporous reverse osmosis membranes, which have comprehensive solute rejection …