Interparticle forces arising from adsorbed surfactants in colloidal suspensions: An additional attractive force

Y. K. Leong, D. V. Boger, P. J. Scales, T. W. Healy

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The effects of alkyl chain length and concentration of surfactant on the yield stress-pH behavior of a 57 wt% ZrO2 suspension were evaluated. An alkyl chain length n of between 5 to 12 carbons was used. For chain length n ≤ 7, a much larger maximum yield stress (at zero zeta potential) than that without additive was recorded. The increase in the maximum yield stress is as much as sixfold. Generally, a higher surfactant concentration leads to a higher yield stress. The increase in the maximum yield stress is quite insensitive to surfactant chain length. Ionic strength appears to have no effect on the yield stress-pH behavior of suspensions with a surfactant. The data are consistent with the observation of a long-range attractive (hydrophobic) force measured in surface force experiments.

Original languageEnglish
Pages (from-to)605-612
Number of pages8
JournalJournal of Colloid and Interface Science
Volume181
Issue number2
DOIs
Publication statusPublished - 1 Jan 1996
Externally publishedYes

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