Contact angles on charged substrates

Lambertus G J Fokkink, John Ralston

Research output: Contribution to journalArticleResearchpeer-review

58 Citations (Scopus)

Abstract

The influence of electrical double layers on the macroscopic solid-liquid-vapour contact angle φ is investigated. It is shown that the presence of an electrical double layer at the solid-liquid phase boundary accounts for the maximum hydrophobicity of solids at their point of zero charge. Using a simple double layer model, theoretical dependences of φ on the activity of the potential determining ions (pX) and the indifferent electrolyte concentration have been computed. Experimentally observed trends in φ on silver iodide and surface modified quartz agree with the theoretical predictions. A way in which measured φ(pX) relationships shed light on deviations from Nernstian surface potential (pX) behaviour is indicated.

Original languageEnglish
Pages (from-to)69-76
Number of pages8
JournalColloids and Surfaces
Volume36
Issue number1
DOIs
Publication statusPublished - 1 Jan 1989
Externally publishedYes

Cite this

Fokkink, Lambertus G J ; Ralston, John. / Contact angles on charged substrates. In: Colloids and Surfaces. 1989 ; Vol. 36, No. 1. pp. 69-76.
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Contact angles on charged substrates. / Fokkink, Lambertus G J; Ralston, John.

In: Colloids and Surfaces, Vol. 36, No. 1, 01.01.1989, p. 69-76.

Research output: Contribution to journalArticleResearchpeer-review

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