Cellulose based bulk pH optomembranes
Wojciech Wróblewski , Ewa Roźniecka , Artur Dybko , Zbigniew Brzózka
AbstractThe 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.
|Journal series||Sensors and Actuators B - Chemical, ISSN 0925-4005|
|Keywords in English||Bulk optomembranes, Fiber optic chemical sensors, Immobilization of reagent, pH optrodes|
|Publication indicators||: 2006 = 2.331 (2) - 2007=3.182 (5)|
|Citation count*||19 (2018-02-07)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.