Showing papers by "Ora Kedem published in 1998"
TL;DR: Radical grafting of two monomers, methacrylic acid and polyethylene glycolmethacrylate, onto commercial composite polyamide reverse osmosis membranes was performed and found that the membranes were surface modified without damage to their transport properties.
221 citations
TL;DR: In this article, a new grafting procedure was developed for surface modification of commercial polyamide reverse osmosis membranes, which was successfully grafted from aqueous solutions under mild conditions.
Abstract: A new grafting procedure was developed for surface modification of commercial polyamide reverse osmosis membranes. Acidic and neutral acrylic monomers and sulfo-containing vinyl monomers were successfully grafted from aqueous solutions under mild conditions. The modifications were monitored by ATR-FTIR spectra. The characteristic peaks of functional groups introduced by grafting were evaluated. The spectral findings correlated with physicochemical properties of the membranes.
147 citations
TL;DR: GARD represents a simple model for primordial chemical selection of mutually catalytic sets and can sustain self-replication up to a critical dilution rate, λc, related to the graded extent of mutual catalysis.
Abstract: A Graded Autocatalysis Replication Domain (GARD) model is proposed, which provides a rigorous kinetic analysis of simple chemical sets that manifest mutual catalysis. It is shown that catalytic closure can sustain self-replication up to a critical dilution rate, λc, related to the graded extent of mutual catalysis. We explore the behavior of vesicles containing GARD species whose mutual catalysis is governed by a previously published statistical distribution. In the population thus generated, some GARD vesicles display a significantly higher replication efficiency than most others. GARD thus represents a simple model for primordial chemical selection of mutually catalytic sets.
114 citations
TL;DR: In this article, an ion-conducting spacers were prepared by applying an ion exchange coating to commercially available polypropylene netting, which increased current efficiency and decreased cell resistance.
41 citations
TL;DR: In this paper, a modified heterogeneous ion exchange membrane was applied to a polyethylene-polyvinyl alcohol (PVA) and a ground anion exchange particle was embedded in polyvinylalcohol crosslinked by hexamethoxymethylmelamin.
14 citations
13 citations
Patent•
09 Apr 1998TL;DR: A polymeric netting for use as an ion-conducting ser in an electrodialysis stack having charged groups incorporated in a in polymeric coating applied thereto, imparting to the spacer an average ion exchange capacity of at least 0.25 meq/gr.
Abstract: The invention provides a polymeric netting for use as an ion-conducting ser in an electrodialysis stack having charged groups incorporated in a in polymeric coating applied thereto, imparting to the spacer an average ion exchange capacity of at least 0.25 meq/gr.
9 citations