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Abstract
The effects of various types of anionic surfactants and inorganic phosphates on the stabilities of aqueous inorganic pigment suspensions have been examined. The stabilities were evaluated from sedimentation velocity data. At low concentrations the stabilities increase with the increases in concentrations of surfactants and inorganic phosphates, whereas at high concentrations they decrease remarkably with the increase in the concentrations above a certain value, which varies with the chemical composition and molecular weight of surfactants and inorganic phosphates, and also varies with the sort of inorganic pigments. The stability data at low concentrations are closely related with the zeta potential data or adsorption data, whereas the stability data at high concentrations are not related with zeta potential data or adsorption data. The stability data in the systems of 1 — 1 type surfactants such as sodium dodecyl sulfate and sodium dodecylbenzene sulfonate, in which the stabilities are little influenced by the pH changes accompanied with the increase in concentrations, can be explained by the application of the D. L. V. O. theory qualitatively. The stabilities pH-influenced, when pH values of the systems are considerably changed.
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