The mechanochemical formation and homogeneity of aluminosilicate precursors was investigated with respect to the influence of particle size and chemical form of the aluminium hydroxide starting material. Aluminium hydroxide in the form of bayerite with a large particle size was found to be more reactive than gibbsite of small particle size. 29Si and 27Al MAS–NMR, DTA–TG, and XRD measurements showed that ground mixtures of aluminium hydroxide and silica gel are more homogeneous than mixtures containing silicic acid.
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