CHARACTERISATION OF FINE ALUMINA POWDERS OF MAXIMUM POROSITY PREPARED BY EMULSION EVAPORATION

Water in oil emulsions were prepared by A1(NO3)3 solutions having various concentrations between 0.25 - 2.00 M. The emulsion droplets were investigated by optical microscopy. Infinitely stable emulsions were evaporated by dropping them into hot mineral oil. The precipitated dark brown precursors were calcined at 1000°C and fine alumina powders were obtained. Adsorption and desorption of nitrogen on the powders was realized at 77K. The specific surface areas (A) and the specific micropore-mesopore volumes (V) were determined respectively from the data of adsorption and desorption. The variation of the A and V values as a function of the concentration of A1(NO3)3 solutions was determined. The powder which had the maximum A and V values, was characterised by taking its photograph by an electron microscope and also by determining its particle size distribution and mesopore size distribution.

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  • Communications Faculty of Sciences University of Ankara Series B Chemistry and Chemical Engineering
Communications Faculty of Sciences University of Ankara Series B Chemistry and Chemical Engineering-Cover
  • ISSN: 1303-6017
  • Başlangıç: 1948
  • Yayıncı: Ankara Üniversitesi