Abstract
The adsorption of poly(sodium(4)styrenesulfonate) (PSSNa) on colloidal iron oxide has been studied with several techniques. Measurements of the adsorption isotherm as well as the electrophoretic mobility and particle size as a function of polymer concentration has been performed. Also, the electrophoretic mobility of both bare and PSSNa coated iron oxide has been studied as a function of pH. Results from the applied techniques individually demonstrate the adsorption of the polyelectrolyte to the iron oxide particle surface. In the absence of or at low polymer concentrations (and pH 4) the suspension is stabilized by a high net positive charge from the exposed iron oxide surface. Intermediate concentrations yield unstable and precipitating suspensions, probably because of a low net surface charge due to the partial coating and neutralization by adsorption of small amounts of the polyanionic polymer. At high polymer concentration the resulting suspension is again stabilized, probably due to the build up of a multi-molecular layer of polymer and a high net negative surface charge.
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