Issa M El-Nahhal, Shehata M Zourab, Nizam M El-Ashgar
Abstract
Transparent monolithic silica doping with phenolphthalein has been prepared via the acid-catalyzed sol-gel reactions of tetraethylorthosilicate in the presence of phenolphthalein. The immobilized phenolphthalein pH-indicator shows similar behavior as its solution counterpart. The UV/Vis spectra indicate that the phenolphthalein retains its structure during the sol-gel reactions in terms of response to pH. The phenolphthalein can be regarded as uniformly distributed in the silica matrix. This observation has been confirmed using polarized microscopy.
Publication Date
8/31/2001
Publisher
Journal of dispersion science and technology, Taylor & Francis Group
أ.د نظام محمود الأشقر | Prof. Nizam M. El-Ashgar | 12317