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Double-layer and solvation forces measured in a molten salt and its mixtures with water

journal contribution
posted on 1988-06-01, 00:00 authored by Roger Horn, D Evans, B Ninham
Measurements have been made of the force between molecularly smooth mica surfaces immersed in ethylammonium nitrate, which is a molten salt at room temperature, and in mixtures of this salt with water across the concentration range from 10 -4 M to that of the pure salt, which is 11.2 M. At low concentrations the salt behaves as a typical 1:1 electrolyte, and we measure an electrical double-layer force whose range decreases with increasing salt concentration. At high concentrations, above about 1 M, the double-layer force becomes so weak and short-ranged that it is completely dominated by a solvation force extending up to 5 nm. In the pure molten salt the solvation force is an oscillatory function of surface separation comparable to that measured in simple nonpolar liquids. No monotonic component of solvation force is found.

History

Journal

Journal of physical chemistry

Volume

92

Issue

12

Pagination

3531 - 3537

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

0022-3654

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1988, American Chemical Society

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