Calculation of the surface charge and potential and of the structural component of disjoining pressure in an interlayer in KCl solutions between glass samples

• Published in: Progress in surface science 1992-05, Vol.40 (1-4), p.418-421
• Main Authors: Rabinovich, Ya.I., Derjaguin, B.V.
• Format: Article
• Language: English
• ISSN: 0079-6816; 1878-4240
• DOI: 10.1016/0079-6816(92)90070-X

The dependence of the Stern potential, ψ1, of glass samples on the distance between these, H, has been theoretically calculated, while taking into account the Stern isotherm and the electroneutrality equation. Comparison of the theoretical dependences ψ1(C)H→∞ with those previously experimentally obtained enables one to calculate the energy of adsorption of OH ions on glass and, further, the dependence ψ1(H). It has been shown that for pH 4–6 and CKCl = 10-2-10-5 mol/L, the value of ψ1 practically does not depend on H. The result obtained was used to calculate theoretically the ionic-electrostatic forces and to compute (from the experimental values of the interaction forces) structural forces Us(H). The dependence thus obtained, Us(H), is of exponential character.