Nevertheless, modification of the acidity was obtained, with the lowest values between 50 and 80 ☌ drying temperature. IGC measurements indicated no variation of the basicity of the specimens examined and little variation of the surface energy. Experiments indicated that it was more favourable to use a hydrated powder that had been dried within the temperature range of 50 to 93 ☌ to obtain the highest uptake. The uptake of GPS was determined by quantitative XPS analysis and the hydrated powders exhibited the highest uptake for all drying temperatures except room temperature. It was found that the hydration treatment used to create hydroxyl sites was efficient in terms of GPS adsorption. The powder was then dried at various temperatures ranging from room temperature to 120 ☌. Alumina and hydrated alumina were treated with hydrolysed γ-glycidoxypropyltrimethoxysilane (GPS) in aqueous solution.
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