Thermodynamic considerations on the contribution of the dissociation of silanol groups to the stability of silica sols
Review articleOpen access

AbstractA new relationship for the free energy of silanol-group dissociation on silica sol particles is derived, including both an electrical and a chemical part. Using an equation for the calculation of the dissociation equilibrium based on the simple Gouy-Chapman model of the electrochemical double layer, we discuss the contribution of this term to stabilization of silica sol in a weak alkaline aqueous dispersion. We find minima of the Helmholtz free energy in dependence on dispersion composition. They are identified as stable states in a thermodynamic sense. Relation results between sol composition and particle size of thermodynamic stable states.

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