Inter-particle forces arising from adsorbed bolaform surfactants in colloidal suspensions

Abstract

The effects of adsorbed bolaform surfactants, [HOOC(CH₂)_nCOOH], on the yield stress–pH behaviour of concentrated aqueous ZrO₂ suspensions are reported. Both the bolaform concentration and its chain length, n, increase the yield stress. A ten-fold increase in the maximum yield stress, τ_ymax, is recorded for n⩾10. The results are explained in terms of a particle bridging model. The increase in τ_ymax reaches a limit at the critical dimer concentration.

References

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