Cellulose based bulk pH optomembranes

Wojciech Wróblewski , Ewa Roźniecka , Artur Dybko , Zbigniew Brzózka

Abstract

The paper presents an efficient technique for the preparation of pH-sensitive bulk optomembranes for fiber optic chemical sensors (FOCS). The method is based on the physical entrapment of the reagent molecules in the bulk of cellulose acetate membranes. The durable immobilization of a pH indicator is achieved by the addition of an appropriate ion-balance reagent to the cellulose matrix. The composition and thickness of the pH-sensitive layer containing Congo red (basic pH chromoionophore) were optimized. The best performance (dynamic range, response time) were obtained for 10 μm membranes containing 30\% of a wetting agent and a hydrophilic plasticizer. The efficiency of this immobilization technique was also verified for unmodified acidic pH indicators: Bromothymol blue and Thymol blue.
Author Wojciech Wróblewski ZMB
Wojciech Wróblewski,,
- Department Of Microbioanalytics
, Ewa Roźniecka
Ewa Roźniecka,,
-
, Artur Dybko ZMB
Artur Dybko,,
- Department Of Microbioanalytics
, Zbigniew Brzózka ZMB
Zbigniew Brzózka,,
- Department Of Microbioanalytics
Journal seriesSensors and Actuators B - Chemical, ISSN 0925-4005
Issue year1998
Vol48
No1–3
Pages471--475
Keywords in EnglishBulk optomembranes, Fiber optic chemical sensors, Immobilization of reagent, pH optrodes
DOIDOI:10.1016/S0925-4005(98)00087-2
URL http://www.sciencedirect.com/science/article/pii/S0925400598000872
Score (nominal)40
Publication indicators WoS Impact Factor: 2006 = 2.331 (2) - 2007=3.182 (5)
Citation count*19 (2018-06-17)
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