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

Wright, John D., 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. (doi:10.1039/b310278e) (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) (KAR id:10811)

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.
Official URL:
https://doi.org/10.1039/b310278e

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
DOI/Identification number: 10.1039/b310278e
Additional information: 14 ROYAL SOC CHEMISTRY 761PX
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Maggie Francis
Date Deposited: 03 Oct 2008 14:34 UTC
Last Modified: 16 Nov 2021 09:49 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/10811 (The current URI for this page, for reference purposes)

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