The effects of cis-trans configuration of cyclohexane multi-carboxylic acids on colloidal forces in dispersions: Steric, hydrophobic and bridging

A. V.M. Chandramalar, Y. Y. Lim, Y. K. Leong

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10 Citations (Scopus)

Abstract

The effects of cis- and trans-1,2-, trans-1,4-cyclohexanedicarboxylic acid, 95% cis-1,3,5-cyclohexane tricarboxylic acid and cis-1,2,3,4,5,6-cyclohexanehexacarboxylic acid on the yield stress-pH behaviour of concentrated ZrO2 dispersions are reported. Adsorbed cis-1,2,3,4,5,6-cyclohexanehexacarboxylic acid imparts predominantly steric interactions. It forms a steric barrier keeping the interacting particles apart. Adsorbed cis- and trans-1,2 increase the maximum yield stress and this was attributed to a hydrophobic force resulting from the part of the cyclohexane ring sticking out into the solution which is devoid of charged or hydrophilic group. Adsorbed trans-1,4 increases the maximum yield stress by at least threefold and its configuration favours strong bridging interaction with an adjacent particle. Predominantly, cis-1,3,5 also increases the maximum yield stress but only by 60% at the same additive concentration. This was attributed to a smaller degree of bridging. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume160
Issue number3
DOIs
Publication statusPublished - Dec 1999
Externally publishedYes

Keywords

  • Carboxylic acids
  • Cyclohexane
  • Dispersions
  • Hydrophobic forces
  • pH
  • Steric, bridging
  • Yield stress

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