The Rheological Properties of Organosilica Suspensions with Different Ratio of Silanol and Trymethylsilyl Groups
Journal Title: Фізика і хімія твердого тіла - Year 2014, Vol 15, Issue 2
Abstract
The rheological properties of water organosilica suspensions with different ratio of silanol and trymethylsilyl groups are investigated in the article. It is set that substitution of 50 % silanols on fumed silica surface for (CH3)3Si-groups is results in decrease of hydrophilicity coefficient of superfine silica from 2,0 to 1,4. The grafted groups change substantially the electrostatic potential distribution on SiO2 surface. The areas with negative potential appear near Si atoms of grafted groups. Suspensions of modified silicas have higher equilibrium viscosity compared to that of base silica. Superfine particles do not lose a thickening power even at destruction of their fractal structure by the ultrasonic field. New rheological properties of modified silicas are conditioned by domination on its surface areas with negative electrostatic potential, which reduces the interparticle interaction in suspension and increases the interaction of the surface with molecules of aqueous medium.
Authors and Affiliations
I. F. Myronyuk, V. I. Mandzyuk, N. A. Bezruka, Ye. P. Voronin, O. V. Goncharuk, V. M. Ogenko
Keywords
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