The flocculation of arachidic acid and octadecanol sols has been studied as a function of the concentration of sodium chloride, hydrochloric acid, barium perchlorate and lanthanum nitrate. The electrophoretic mobilities of the sols in the presence of the same electrolytes have been measured and the zeta potentials calculated. Surface potentials of spread monolayers of the acid and alcohol have also been measured and ψ0 has been calculated. Using the flocculation concentration thresholds and either ψ0 or ζ, Hamaker " constants " A have been calculated in an attempt to explain the results in terms of the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. A wide variation in A has been found, and it is suggested that it may be possible to explain this by the introduction of a repulsive solvation potential term into the DLVO theory.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry