2001•Journal of Dispersion Science and TechnologyRequires access

Encapsulation of Phenolphthalein pH-Indicator into a Sol-Gel Matrix

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.

About this research paper

What this paper is about

Why it matters

OpenAlex reports 49 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Key concepts: Phenolphthalein, Chemistry, Sol-gel, Doping, Silica gel, Chemical engineering, Materials science, Chromatography