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

Authors : Y. SARIKAYA

Pages : 0-0

View : 12 | Download : 4

Publication Date : 2001-01-01

Article Type : Research Paper

Abstract :Water in oil emulsions were prepared by A1insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(A); and the specific micropore-mesopore volumes insert ignore into journalissuearticles values(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 A1insert ignore into journalissuearticles values(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.
Keywords : CHARACTERISATION, POROSITY, PREPARED