Flocculation of iron(III) oxide hydrate sols induced by .ALPHA.,.OMEGA.-type surfactants.

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The interactions of disodium salt of bis(3-sulfopropyl) α,ω-alkanedicarboxylate(C10-α,ω and C12-α,ω) with monodispersed spherical particles of iron(III) oxide hydrate sols were studied by measuring the mean particle size, the zeta-potential and the amounts of adsorption. The sols were flocculated by the addition of small amounts of C10-α,ω and C12-α,ω. The flocks thus formed were redispersed by the further addition of these surfactants. The flocculation of sols upon the addition of α,ω-type surfactants occurred over a wider concentration range than upon the addition of an ordinary surfactant, such as sodium dodecyl sulfate(SDS). Furthermore, the mechanism of redispersion upon the addition of α,ω-type surfactants is different with the two fold adsorption layer in SDS.
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