Wright, J.D. and Higginson, N.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.
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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.
|Additional information:||14 ROYAL SOC CHEMISTRY 761PX|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences|
|Depositing User:||Maggie Francis|
|Date Deposited:||03 Oct 2008 14:34|
|Last Modified:||14 Jan 2010 14:41|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/10811 (The current URI for this page, for reference purposes)|
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