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Cross‐linked Polyvinyl Alcohol pH Sensitive Membrane Immobilized with Phenol Red for Optical pH Sensors
Author(s) -
Luo FaLiang,
Liu ZhiHong,
Chen TianLu,
Gong BoLin
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690065
Subject(s) - chemistry , polyvinyl alcohol , membrane , phenol , acrylamide , phenol red , covalent bond , polymer chemistry , chemical engineering , chromatography , monomer , polymer , organic chemistry , biochemistry , engineering
An optical pH sensitive membrane for optical pH sensors has been developed by covalently immobilizing phenol red on optical transparent cross‐linked polyvinyl alcohol (PVA) membrane surfaces. The phenol red was first reacted with acrylamide to form a product of acrylamide grafted phenol red (AAGP), then the AAGP was covalently immobilized to the PVA membrane via surface grafting‐polymerization using Fe 2+ /H 2 O 2 as initiator. The performance of the pH sensitive membrane was investigated and the results showed that the pH sensitive membrane has some features including a linear response scope from pH 6.5 to 8.5 closed with phenol solution, a rapid response time (<20 s), good reproducibility, reversibility, excellent stability and easiness of fabrication. These show that the pH sensitive membrane can be used as a sensitive layer for optical pH sensor.