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.
| The full text of this publication is not available from this repository. (Contact us about this Publication) |
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: | 14 Jan 2010 14:41 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/10811 (The current URI for this page, for reference purposes) |
- Depositors only (login required):
