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THE INFLUENCE OF pH AND UV VISBILE ABSORBTION ON HYDROLYSIS STAGE AND GEL BEHAVIOR OF GLASSES SYNTHESIZED BY SOL-GEL

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Lead-containing gla ss borosili cate was synthes ized by Sol-gel technique using metalalkoxids such as tetra ethyleorthosilicate (TEOS) . Al- sec-butoxide and trimethyl borate. The sol containing TEOS converts to gel durin g drop wise addition ofAI-alkoxide while inorganic lead salt was added in the last stage ofge lation to prepare the alcogels. The specimens were dried at room temperature to set then heated at 600 °C qui ckly to avoid crystallization preparing a gla ss containing 63 wt% lead oxide. The influence ofpH on absorption behavior of the sols studied by UV visible technique so the characteristic of the ge l, alcogel and xe roge l were studied in the different acidi c concentrations. The UV spectrums show that the high er the acidity of the hydrolysis stages, the high er the absorbance. The results showed the sample with 63 wt% lead was found fully amorphous. Microstructure and phase analysis of the g lass po wders were investigated by X-ray diffraction (XRD). X-ray fluorescence (XRF) and scanning electron microscopy (SEM) equipped with EDS analysis.

1199947