Abstract—
Capillary electrokinetics has been employed to measure the streaming current in solutions of alkali metal chlorides at electrolyte concentrations of 0.1 and 1 M. The results obtained have confirmed the earlier conclusion that there are no hydrodynamically immobile layers near a solid molecularly smooth surface. It has been shown that the magnitudes of the current and the calculated electrokinetic potential decrease in a series LiCl, NaCl, KCl, RbCl, and CsCl. In this series, the crystallographic radius increases and the radius of a hydrated ion decreases. The obtained dependences have led to a conclusion that the cations located near a negatively charged surface are unhydrated.
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Sobolev, V.D., Sergeeva, I.P. & Vasileva, E.R. Electrokinetic Measurements in Highly Concentrated Solutions of Alkali Metal Chlorides. Colloid J 84, 754–760 (2022). https://doi.org/10.1134/S1061933X22700144
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DOI: https://doi.org/10.1134/S1061933X22700144