Electric double layer and electrostatic interaction of hydrophobic particles.
An hypothesis regarding the impact of water density near hydrophobic surfaces on the electrostatic component of their interaction was offered. A theoretical model of the electric double layer and the interparticle interaction under conditions of the variable density and, consequently, variable dielectric permittivity of water has been developed. It was shown that reduction of the dielectric permittivity near interfaces determined by their hydrophobicity resulted in compression of double electrical layers and weakening of their overlapping. This, in its turn, results in reduction of the electrostatic repulsion of hydrophobic disperse particles as compared with nonhydrophobic ones.
Mishchuk
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Institute of Colloid Chemistry and Chemistry of Water, The National Academy of Sciences of Ukraine, pr. Vernadskogo, 42, Kyiv 03680, Ukraine. nataliya@mis.kiev.ua