Surface properties of silicon nitride powders
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The surface charge densities of silicon nitride powders in NaNO3 solutions of various concentrations were investigated by the potentiometric acid-base titration method. The points of zero charge, pH(pzc) of silicon nitride powders were determined by the batch equilibration method. The site-binding model was applied to calculate the intrinsic acidity constants describing association -dissociation of silicon nitride surface groups. (C) 2002 Elsevier Science B.V. All rights reserved.