Cajlakovic, Merima and Lobnik, Aleksandra and Werner, Tobias (2002) Stability of new optical pH sensing material based on cross-linked poly(vinyl alcohol) copolymer. ANALYTICA CHIMICA ACTA, 455 (2): PII S0003-. pp. 207-213. ISSN 0003-2670
Full text not available from this repository. (Request a copy)Abstract
Cross-linked poly(vinyl alcohol) (PVA)-silica get copolymer has been employed as a optical pH sensor substrate for immobilisation of fluorescein. Cross-linking was carried out by the sol-gel process incorporating PVA in initial sol-gel solution of tetra-methoxysilane (TMOS) under acidic conditions. Three dimensional network formation could be achieved using compositions of PVA/TMOS = 80-90/20-10 vol.% to result in crack-free films. The fluorescent sensor layers were prepared by dip-coating of gel solution onto glass slides. The dynamic fluorescence response towards different pH values was investigated in terms of the influence of sample ionic strength, membrane composition as well as age of sol-gel layers. Depending on the composition of the matrix pK(a) values of 6.50, 6.68 and 7.06 were found 18 days after continues storage in buffer. (C) 2002 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FLUORESCENT-PROBE; CHEMICAL SENSORS; THIN-FILMS; GEL; SILICA; GLASSES; IMMOBILIZATION; ELASTOMER; POLYMERS; COATINGS; optical pH sensor; fluorescein; sol-gel; cross-linked poly(vinyl alcohol); fluorescence; immobilisation |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Nov 2021 10:21 |
| Last Modified: | 03 Nov 2021 10:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40463 |
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