Naslov
Spectropotentiometric investigations od solvent polymer sensor membranes

Autori
Zwickl, T. ; Schneider, B. ; Federer, B. ; Sokalski, T. ; Lindner, E. ; Schaller, U. ; Cimerman, Zvjezdana ; Pretsch, E.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the Symposium on Chemical and Biological Sensors and Analytical Electrochemical Methods / Ricco, A ; Buttler, M.A ; Vanysek, P ; Horvai, G ; Silva, A.F. - : The Electrochemical Society (ECS), 1997, 1080-1089

Skup
Symposium on Chemical and Biological Sensors and Analytical Electrochemical Methods

Mjesto i datum
Pennington (NJ), Sjedinjene Američke Države, 1997

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Sažetak
Various time-dependent processes in the bulk of solvent polymer membranes based on plasticized poly(vinly chloride) are analyzed with a flow-through cell mounted on a microscope equipped with optical filters.A CCD camer is used to record pictures with a resolution of ca. 2 ?m. Water uptake of dry membranes is monitored through a new lipophilic water indicator. From time.dependent absorbance changes, an apparent water diffusion coefficient., D*H2O of 2x10-8 cm2 s-1 is determined. In contrast to earlier results obtained with hidrophilic water indicators, we found that D*H2O is not time-dependent and no light scattering owing to water droplets occurs in the bulk of the membrane. Recently, it has been shown that cation interference induces long-term potential drifts of H+- selective electrode membranes based on a lipopohilic chromoionophore. These drifts have been correlated with diffusion processes by simultaneously monitoring the concentration profiles od the protonated and unprotonated chromoionophore.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA