The stability of silica dispersions in ethanol/ cyclohexane mixtures

Brian Vincent, Zoltán Király, Simon Emmett, Adrian Beaver

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Dispersions of hydrophilic silica particles, which are charge-stabilised in ethanol, may be flocculated on the addition of sufficient cyclohexane. The primary mechanism is the reduction in the zeta potential. The flocculation observed is kinetically controlled; it is irreversible and time dependent. By way of contrast, dispersions of hydrophobised particles (i.e., silica particles carrying terminally-grafted n-octadecyl chains) in cyclohexane are uncharged and behave virtually as dispersions of hard-sphere particles. Addition of ethanol, beyond a critical concentration leads to particle "phase separation" (weak flocculation); this is thermodynamically controlled.

Original languageEnglish
Pages (from-to)121-132
Number of pages12
JournalColloids and Surfaces
Volume49
Issue numberC
DOIs
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Engineering(all)

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