Abstract
The stability of dispersions of iron oxide in mixed solutions of polyvinylpyrrolidone and sodium alkyl sulfate has been investigated. The results show that polyvinylpyrrolidone and sodium alkyl sulfate alone cannot stabilise the iron oxide dispersions effectively. However, the presence of low concentrations of sodium alkyl sulfate enhances the stabilizing effect of polyvinylpyrrolidone markedly, while the presence of a high concentration of sodium alkyl sulfate deminishes this enhanced stabilizing effect. This phenomenon is suggested to be a consequence of the interaction between polyvinylpyrrolidone and sodium alkyl sulfate. The formation of surface complexes of polyvinylpyrrolidone and sodium alkyl sulfate at low concentrations of sodium alkyl sulfate enhances the adsorption of polyvinylpyrrolidone and hence the stability of the dispersions, while the decrease of polyvinylpyrrolidone adsorption at high concentrations of sodium alkyl sulfate, due to the formation of polyvinylpyrrolidone/sodium alkyl sulfate in solution, leads to a depression of the enhanced stability of iron oxide dispersions.
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