Polysulfone
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. POLYETHERIMIDE/POLYVINYLPYRROLIDONE HOLLOW-FIBER MEMBRANES FOR USE IN HEMODIALYSIS
Abstract In this study, polyetherimide/polyvinylpyrrolidone (PEI/PVP) hollow fiber membranes (HFMs) were synthesized by the phase inversion method. The synthesized PEI/PVP membranes were characterized by morphological analysis and transport properties (hydraulic permeability and solute rejection coefficient). Their performance in uremic solutes separation wa
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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2. A Dual-mode model interpretation of CO2/CH4 permeability in polysulfone membranes at low pressures
ABSTRACT An asymmetric membrane of polysulfone (PSf) was synthesized by phase inversion method. Permeation experiments were carried out between 2 to 5 bar pressure, and at temperatures 20 to 45°C. The dense-selective layer of PSf membrane presents regular thickness (about 5 µm), and was not possible to observe the formation of macrovoids in porous layer. T
An. Acad. Bras. Ciênc.. Publicado em: 2018-04
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3. Harmonious interaction of incorporating CNTs and zeolitic imidazole frameworks into polysulfone to prepare high performance MMMs for CO 2 separation from humidified post combustion gases
Abstract Multi-walled carbon nanotubes (CNTs) and zeolitic imidazole frameworks (ZIF-301) were synergistically incorporated into glassy polysulfone (PSF) to prepare mixed-matrix membranes (MMMs) to separate CO2 from post combustion flue gas. The flexible MMMs rendering consistent distribution and improved adhesion of nanofillers with the polymer matrix were
Braz. J. Chem. Eng.. Publicado em: 2018-01
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4. Oil Removal from Produced Water by Ultrafiltration using Polysulfone Membrane
Abstract The present paper deals with the ultrafiltration (UF) of produced water using a polysulfone membrane. Membranes were prepared by the phase inversion technique using polysulfone (PSf) polymer base, poly vinyl pyrrolidone (PVP) additive and N-methyl-2-pyrrolidone (NMP) solvent. Prepared UF membranes were characterized by determining the surface morpho
Braz. J. Chem. Eng.. Publicado em: 2017-04
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5. Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion
Polymer solutions of polysulfone (PSf) and methylcellulose (MC) in 1-methyl-2-pyrrolidone (NMP) were used to prepare ultrafiltration membranes by the phase inversion technique via immersion precipitation. The effect of MC additive on the structure and performances of the membranes was studied. The obtained membranes were characterized by scanning electron mi
Mat. Res.. Publicado em: 23/01/2017
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6. Preparation, characterization and gas permeation study of PSf/MgO nanocomposite membrane
Nanocomposite membranes composed of polymer and inorganic nanoparticles are a novel method to enhance gas separation performance. In this study, membranes were fabricated from polysulfone (PSf) containing magnesium oxide (MgO) nanoparticles and gas permeation properties of the resulting membranes were investigated. Membranes were prepared by solution blendin
Braz. J. Chem. Eng.. Publicado em: 2013-09
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7. Modification of PSf membrane nanostructure using different fabrication parameters and investigation of the CO2 separation properties of PDMS-coated PSf composite membranes
The effects of preparation parameters on the performance and morphology of polydimethylsiloxane/ polysulfone (PDMS/PSf) membranes were investigated. The PDMS layer is mainly used for sealing the defects of the PSf selective layer. The membrane morphologies were characterized by using scanning electron microscopy (SEM). The CO2/CH4 separation performance of m
Braz. J. Chem. Eng.. Publicado em: 2013-06
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8. Beer Clarification with polysulfone membrane and study on fouling mechanism
The aims of the present work were to study the relationship between the fluxes, permeate quality, and fouling mechanism. A polysulfone membrane with 100 KDa and 0.12 m² of surface area was used. Permeate fluxes were measured for different pressures (0.5, 1.0, 1.5, and 2.0 bar) at the same temperature of 8 ºC. The fluxes measured for each pressure ranged fr
Brazilian Archives of Biology and Technology. Publicado em: 2011-12
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9. Caracterização físico-química e ação antimicrobiana de nanopartículas de prata obtidas por uma nova síntese / Characterization and application of silver nanoparticles obtained by a new method
A síntese de nanopartículas de prata tem atraído interesse em virtude de novas e diferentes características físicas e químicas que possuem quando comparadas com as que compõem a fase macroscópica. Estas características permitem aplicações atrativas em vários campos, inclusive na área de alimentos. O trabalho teve como objetivos: 1) caracterizar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/07/2010
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10. Produção e caracterização de membranas de microfiltração e ultrafiltração pelo método de inversão de fases, utilizando polisulfona como matéria-prima. / Production and characterization of microfiltration and ultrafiltration membranes via phase inversion process employing polysulfone as raw material.
A presente pesquisa consistiu em produzir membranas sintéticas pelo processo de inversão de fases via precipitação por imersão e levantar dados operacionais relativos ao preparo das soluções poliméricas e respectivos espalhamentos sobre um suporte inerte, de forma a obter-se membranas uniformes, livres de imperfeições que possam afetar seu desempen
Publicado em: 2010
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11. Development and characterization of Cottage-like Cheese additioned of Lactobacillus delbrueckii UFV H2b20 and inulin / Desenvolvimento e caracterização de queijo tipo Cottage adicionado de Lactobacillus delbrueckii UFV H2b20 e de inulina
Probiotics are microorganisms which promote beneficial effects on the health of their host when ingested with food in adequate quantities. Prebiotics, on the other hand, are indigestible ingredients which selectively stimulate the growth or the metabolic activity of beneficial bacteria in the colon. A product is called symbiotic when it contains probiotic ce
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/02/2007
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12. INFLUÊNCIA DO TIPO DE MEMBRANA DE HEMODIÁLISE E DA SUA REUTILIZAÇÃO NOS MARCADORES DE ESTRESSE OXIDATIVO / INFLUENCE OF DIALYZER MEMBRANE TYPE AND REUSE PRACTICE ON BIOMARKERS OF OXIDATIVE STRESS
The effects of the dialysis membranes, hemodialysis (HD) session, and dialyzer reuse on markers of oxidative stress were studied. Patients with end stage renal disease who have undergone regular HD treatment three times a week were randomized in two study groups according to the type of HD membrane (cellulose acetate membrane (CA) vs. polysulfone membrane (P
Publicado em: 2007