Abstract
This paper treats the stability of silver iodide sols in water-ethylene glycol (EG) mixtures. Rates of coagulation, obtained by a stopped-flow technique are analyzed in combination with data on surface charge, conductivity, and density. To some extent, bulk solution properties are reflected in the stability. For instance, indications of contraction, with a maximum at a molar ratio water/EG ≈2 recur in the rates of fast coagulation. It is impossible to describe the transition from water to EG through the variation of the bulk dielectric permittivityonly, because drastic alterations occur also in the Stern layer. Especially its change in thickness and the increasing specific counterion adsorption with increasing EG content are important stability-determining factors. Particularly at high EG concentrations, the outerHelmholtz plane may not be considered as a smeared-out equipotential plane. The mosaic-like potential pattern of this layer suggests the necessity to reconsider the dynamics of particle interactions.
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