Effects of matrix variations on pH and Cu2+ sensing properties of sol-gel entrapped Eriochrome Cyanine R

Wright, John D. and Higginson, Neil A. C. (2004) Effects of matrix variations on pH and Cu2+ sensing properties of sol-gel entrapped Eriochrome Cyanine R. Journal of Materials Chemistry, 14 (2). pp. 201-208. ISSN 0959-9428. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Eriochrome Cyanine R has been entrapped in a range of acid- and base-catalysed silica sol - gel matrices using various values of the water : alkoxide ratio ( R) and total precursor volume and incorporating varying amounts of the organic modifier methyltriethoxysilane (MTES). Diffuse reflectance spectra of thin films of polyisobutylene-bound finely-ground samples of these carefully aged materials have been measured as a function of time in solutions of various pH and Cu2+ concentration. Effects of pore size distribution and organic modification on these sensing properties have been interpreted in terms of data from nitrogen adsorption porosimetry and EXAFS. Optimum sensitivity to low Cu2+ concentrations is achieved for gels incorporating 10% MTES, and the use of the polymer-bound ground samples increases response speed by a factor of 300 relative to bulk monolith sol - gel samples with elimination of cracking effects.

Item Type: Article
Additional information: 14 ROYAL SOC CHEMISTRY 761PX
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 03 Oct 2008 14:34
Last Modified: 25 Jun 2014 14:04
Resource URI: https://kar.kent.ac.uk/id/eprint/10811 (The current URI for this page, for reference purposes)
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