The properties of cation-exchange membranes based on polymeric composites of sulfonated poly(styrene-co-divinylbenzene) and polypyrrole (Ppy) are discussed. The amount of Ppy in the composites depends on the oxidant solution concentration used in the synthesis. Comparing composite membranes, the highest electronic conductivity and the best thermal stability were obtained for the composite membr...

Hydroxide (OH(-))-exchange membranes (HEMs) are important polymer electrolytes enabling the use of affordable and earth-abundant electrocatalysts for electrochemical energy-conversion devices such as HEM fuel cells, HEM electrolyzers, and HEM solar hydrogen generators. Many HEM cations exist, featuring desirable properties, but new cations are still needed to increase chemical stability at elev...

The thermodynamic activities of ion pairs were measured el~ctrometrically in a series of aqueous mixtures of monoionic bentonite and the corresponding chlorides. Ion exchange membranes and Ag-AgC1 electrodes were used. The lyotropie order for the various cation species varied somewhat for two different preparations. The apparent relative escaping tendencies of the various cations did not corres...

A low cost cation exchange membrane to be used in a specific bioelectrochemical system has been developed using poly(ether ether ketone) (PEEK). This material is presented as an alternative to current commercial ion exchange membranes that have been primarily designed for fuel cell applications. To increase the hydrophilicity and ion transport of the PEEK material, charged groups are introduced...

In this research thin film heterogeneous cation exchange membrane was prepared by interfacial polymerization of polyacrylic acid-co-iron nickel oxide nanoparticle son PVC based substrate. Spectra analysis confirmed graft polymerization conclusively. The SEM images showed that polymerized layer covers the membranes by simple gel network entanglement. Results exhibited that membrane water content...

This paper shows the possibility of using a microheterogeneous model to describe properties ion-exchange membranes and calculate characteristics reverse electrodialyzer from data obtained. We studied eight samples heterogeneous cation exchange (two each type membrane). The differed in year issue storage conditions. It is shown that for MK-40 MA-41, samples' can differ significantly. counterions...

The neutral exchange between Na+ or K+ ions and protons across the mitochondrial membrane was studied by means of passive swelling in isotonic acetate salts. The selectivity for Na+ over K+ was approximately 50: 1. The rate of Na+-dependent swelling mediated by the natural exchange system was sensitive to pH and inhibited 70% or more by 20 rnM Mgr+. Physiological Mg 2+ levels, however, inhibite...

Salinity gradient energy is a prominent alternative and maintainable source, which has considerable potential. Reverse electrodialysis (RED) one of the most widely studied methods to extract this energy. Despite progress in research, optimization RED process still ongoing. In study, effects number membrane pairs, ratio salinity feed velocity on power generation via reverse system were investiga...

Heterogeneous proton exchange membranes (PEM) are synthesized using the dry phase inversion technique. The casting solutions are prepared by dispersing a finely ground cation exchange resin particle in N,N-dimethylacetamide (DMAc) solution of polyvinyl-chloride (PVC). Results show that ion exchange capacity is increased with the addition of 1 %-wt nanosilica (from 0.14 to 0.27 meq/g) while it i...