Aqueous dispersion of iron oxide by acrylic oligomer surfactants.

概要

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The aqueous dispersion of iron oxide by acrylic oligomer surfactants was examined by particle size and zeta potential measurements. Iron oxide particles were suspended in an aqueous iron(III) chloride solution to render the surface positively charged. The iron oxide particles so prepared were then flocculated by the addition of a small amount of acrylic oligomer surfactant. The floes of iron oxide could be redispersed by further addition of acrylic oligomer surfactant. The flocculation and the redispersion processes can be explained in terms of a "two-fold adsorption layer" mechanism of the acrylic oligomer surfactant. The concentrations of acrylic oligomer surfactants needed to achieve flocculation and redispersion decreased with an increase in acrylic content of the oligomer surfactants.
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