Journal article

pH dependence of friction forces between silica surfaces in solutions

E Taran, BC Donose, IU Vakarelski, K Higashitani

Journal of Colloid and Interface Science | ACADEMIC PRESS INC ELSEVIER SCIENCE | Published : 2006

Abstract

The pH dependence of the friction between a silica particle and a silica wafer was investigated using lateral force microscopy. Measurements were done in the range of 3.6 < or = pH < or = 10.6 and the effect of high loading force was also examined. It is found that the friction is independent of the pH of solutions and increases linearly with the applied load, when the pH is between 3.6 and 8.6. On the other hand, once the pH is above 9.0, the friction becomes extremely small and the dependence on the applied load becomes nonlinear. It is postulated that this transition is due to the development of a gel layer composed of polymer-like segments of silicilic acid anchored on the surface; at th..

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University of Melbourne Researchers