In this research work, the transport properties of calcium ions (Ca2+) in a heterogeneous cation exchange membrane (IEM) MK-40 Schekinoazot. Aqueous solutions sodium chloride (NaCl) and (CaCl2) 0.01 M 0.02 concentration, respectively, were used. The limit current density numbers evaluated by means chronopotentiometry technique, applying electric pulses, obtaining potential differences, from whi...

Alkaline or hydroxide exchange membrane water electrolysis (HEMWE) is a promising technology for green hydrogen production using platinum group metal-free catalysts and stainless steel, an advantage of alkaline (AWE), gas-impermeable membrane, parallel to proton (PEMWE). However, the HEMWE requires supporting electrolytes there minimal understanding their role on respective reactions. Without S...

water saturation and cation exchange capacity are the most significant parameters used to calculate a hydrocarbon zone potential. in clean formations, by applying the famous archie model, which assumes that in the formation the only electric conductor is the formation water, the water saturation can be calculated. additionally, in shaly sand formations this assumption may not be true as the ion...

A new method for the speciation of ng/mL concentrations of Cr(III) and Cr(VI) solutions with analysis by laser-induced breakdown spectroscopy (LIBS) is reported. Speciation is achieved by pre-concentration of the chromium onto commercially available cation exchange polymer membranes. Chromium(III) is removed directly by cation exchange; chromium(VI) in the filtrate is reduced to Cr(III) and con...

Abstract The low-temperature electrolysis of CO 2 in membrane-based flow reactors is a promising technology for converting captured into valuable chemicals and fuels. In recent years, substantial improvements reactor design have significantly improved the economic viability this technology; thus, field has experienced rapid increase research interest. Among factors related to design, ion exchan...

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...

sulfonated poly (ether ether ketone) (speek) with a low degree of sulfonation (ds = 40%) was prepared for proton exchange membrane fuel cells (pemfc). poly (ether ether ketone) (peek) was sulfonated in concentrated h2so4 under n2 atmosphere and characterized by the hydrogen nuclear magnetic resonance (h-nmr) technique. after preparation of the speek polymer, the obtained polymer was dissolved i...