Encapsulation of phenolphthalein pH-indicator into a sol-gel matrix

被引：42

作者：

El-Nahhal, IM

Zourab, SM

El-Ashgar, NM

机构：

[1] Al Azhar Univ, Dept Chem, Gaza, PNA, Israel

[2] Islam Univ Gaza, Dept Chem, Gaza, PNA, Israel

来源：

JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY | 2001年 / 22卷 / 06期

关键词：

phenolphthalein pH indicator; sol-gel encapsulation; immobilization of indicators; polysiloxanes;

D O I：

10.1081/DIS-100107757

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 countetpart. 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.

引用

页码：583 / 590

页数：8

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