Rheological and optical properties of hydrophobic aerosil particles were examined in benzene-n-heptane and methanol-benzene mixtures. Adsorption measurements on these mixtures proved that the composition of the adsorption layer is a crucial factor determining the adhesion between the particles. The Bingham yield stress and the Ree-Eyring parameters (from rheological measurements) are influenced significantly by the composition of the interfacial layer calculated from adsorption measurements in binary liquids. The minimum of the free energy function for the interfacial layer determines the stability of the particles dispersed in binary mixtures.
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