On Secondary Hydration Force in Stannic Oxide Suspensions.
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概要
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The aqueous suspensions of synthesized stannic oxide enhibit anomalous stability at NaCI concentrations 0.2 M and above. When NaCI concentration is more than 1 M, the suspensions do not coagulate completely even at its i.e.p., which cannot be explained by the classical DLVO theory. This is quite similar to the behavior of aqueous rutile suspensions where the anomalous stability has been attributed to secondary hydration force. The magnitudes of the secondary hydration forces have been estimated using an extended DLVO theory, in which the secondary hydration force is expressed as a double-exponential function. The secondary hydration force is larger at acidic pH and increases with increasing NaCI concentration, which has been also the case with rutile suspensions.<BR>The pH dependence of the secondary hydration force makes it difficult to explain its origin as simply being developed by the adsorption of hydrated cations onto oxide surfaces. It may be required to incorporate the adsorption of hydrated anions with the simple cation adsorption model.
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