Showing papers in "Journal of Membrane Science in 2001"

TL;DR: In this paper, the authors explain the transport properties and the swelling behaviour of NAFION and different sulfonated polyetherketones in terms of distinct differences on the microstructures and in the p K a of the acidic functional groups.

TL;DR: In this article, the most influential membrane properties governing colloidal fouling rate of reverse osmosis (RO) and nanofiltration (NF) membranes were identified for physical surface morphology, surface chemical properties, surface zeta potential, and specific surface chemical structure.

TL;DR: In this article, an overview of the membrane development for proton-conductive polymer (composite) membranes for the application membrane fuel cells, focusing on the membrane developments in this field performed at ICVT.

TL;DR: In this paper, a systematic investigation of the conductivity of Nafion 117 and sulfonated polyether ether ketone (S-PEEK) membranes was performed as a function of relative humidity (rh) in a wide range of temperature (80-160°C).

TL;DR: A review of the development of carbon membranes in the last 30 years and a clear future direction in research for carbon membrane can be found in this article, where carbon membranes can be divided into four major configurations: flat sheet, membrane supported on tube, capillary, and hollow fiber.

TL;DR: In this paper, progress made over the past years in the functionalisation of polybenzimidazole and polyetherketones with a view to increasing their proton conduction properties without detriment to their thermohydrolytic and chemical stability such that corresponding membranes may be employed in hydrogen oxygen (air) or direct methanol fuel cells.

TL;DR: In this paper, the organic-inorganic hybrid of poly(amide-6-b-ethylene oxide) (PEBAX ® ) and silica were prepared via in situ polymerization of tetraethoxysilane (TEOS) using the sol-gel process and their gas transport properties were studied.

TL;DR: The PEBAX® copolymer exhibits a different gas permeation behavior from that of homopolymers as mentioned in this paper, as the amount of impermeable regions in the block copolymers increases, the flow paths for the gas diffusion are restricted.

TL;DR: In this article, the authors developed an extremely simple room temperature chemical cross-linking technology for the modification of polyimide films for gas separations of He/N 2 and O2/N2 using 6FDA-durene as an example.

TL;DR: The membrane reactor (MR) concept, combining in the same unit a conversion effect (catalyst) and a separation effect (membrane), already showed various potential benefits (increased reaction rate, selectivity and yield) for a range of reactions involving the membrane as extractor, distributor or contactor.

TL;DR: In this article, several methods were used to determine the charge of commercially available nanofiltration membranes, and were compared, including titration, streaming potential, and pH of the solution on the membrane charge.

TL;DR: In this paper, the authors examined and reported on the rejection properties of 11 kinds of aromatic pesticides by nanofiltration (NF) membranes (nominal NaCl rejection is 92, 60, 51 and 15%).

TL;DR: In this paper, sulfonated polysulfone with 8% of phosphatoantimonic acid resulted in a conductivity trebling 0.06 versus 0.02 S cm −1 at 80°C and 98% of relative humidity.

TL;DR: In this paper, a simple model based on a solution-diffusion approach is proposed for predicting the pure solvent permeation through hydrophobic polymeric membranes, using molar volume and viscosity of the solvent as parameters.

TL;DR: In this paper, a double pass module design with recirculation of the concentrate in the second module to the feed of the first module was used to remove four pesticides (atrazine, simazine, diuron and isoproturon), hardness and nitrates with the membranes NF70, NF45, UTC-20 and UTC-60.

TL;DR: In this article, the inorganic hollow fiber membranes were prepared by spinning a polymer solution containing suspended aluminum oxide (Al2O3) powders to a hollow fiber precursor, which is then sintered at elevated temperatures.

TL;DR: In this article, a general overview on the potentiality of membrane processes in the treatment of aqueous solutions coming from the leather industry is reported, which can be combined with or modified by membrane processes, such as microfiltration, ultrafiltration (UF), nanofiltration (NF), and reverse osmosis, on the basis of consolidated applications and experimental tests.

TL;DR: In this paper, 2,4,6-triaminopyrimidine (TAP) was used to enhance the contact of zeolite particles with polyimide chains presumably by forming hydrogen bonding between them.

TL;DR: A mixed-conducting perovskite-type Ba0:5Sr 0:5Co0:8Fe0:2O3 (BSCFO) membrane reactor with high oxygen permeability was applied for the activation of methane as mentioned in this paper.

TL;DR: In this article, a silicalite-silicon composite membrane (306μm thick) was made in a laboratory and characterized for flux and selectivities using model acetone ethanol butanol solution.

TL;DR: In this paper, the effects of surface properties on the initial attachment of microorganisms to the surface of polymeric polymeric surfaces were examined. And the results showed that biofilm initiation by a strain of Pseudomonas aeruginosa increases as the surface becomes more rough and more hydrophobic, while fouling is minimal when surface charge is minimized and increases with increasing charge.

TL;DR: In this paper, the authors employed a Fourier transform infrared (FT-IR) spectroscopic method to quantify the conformational change of protein fouled on polysulfone (PS) UF membrane and polytetrafluoroethylene (PTFE) MF membrane.

TL;DR: In this paper, the intrinsic gas transport properties of He, H2, O2, N2, CH4, and CO2 for a 6FDA-durene polyimide as a function of pressure, temperature and aging time were determined.

TL;DR: In this paper, the effect of spacer characteristics can be obtained by computational fluid dynamics, and the results show that both high shear stress regions and eddies are present in the channel due to the spacer cylinders.

TL;DR: In this paper, chemical cross-linking anion exchange series membranes were prepared from linear engineering plastics poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) by conducting the processes of bromination and amination at both benzyl and aryl positions.

TL;DR: In this article, the authors investigated the permeability of poly(dimethylsiloxane) (PDMS) and poly(1-trimethylsilyl-1-propyne) (PTMSP) to a simulated syngas feed containing H 2, CO, CO 2, and H 2 S.

TL;DR: In this paper, a new synthetic route has been investigated for organic/inorganic nanocomposites hybrid polymer membranes of SiO2/polymer (polyethylene oxides (PEO); polypropylene oxide (PPO); polytetramethylene oxide (PTMO)).

TL;DR: In this paper, the flux, retention and stability of nanofiltration (NF) membranes with aqueous and organic solvents, and three selected solutes having the same molecular weight of 350 Da: Orange II, Safranine O and Solvent Blue 35.

TL;DR: In this paper, thin-film silicalite-filled silicone composite membranes were fabricated by incorporating ultrafine silica-1 particles, 0.1-0.2μm, which were synthesized in a laboratory.

TL;DR: In this paper, the preparation of sulfonated polybenzimidazole by sulfuric acid treatment on pre-formed polybenzo-drug membranes was investigated and it was shown that the modified material is stable at temperatures close to 400°C and 100% r.h.