Abstract
The K+ complex of 2-(4-dipropylaminophenylazo)benzoic acid octadecyl ester (ETH 2418), a new lipophilic chromoionophore, is used to monitor the water uptake of dry solvent polymeric membranes based on 2-nitrophenyl octyl ether/poly(vinyl chloride) (2:1). Upon contact with an alkaline solution, its λmax changes from 535 to 435 nm. This process can be reversed by drying the membranes. From the time-dependent recordings of absorbance changes, an apparent water diffusion coefficient, D+H2O, of 2×10-8 cm2 s-1 is determined. In contrast to results obtained with hydrophilic water indicators, no light scattering due to water droplets is observed in the bulk of the membrane.
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Zwickl, T., Schneider, B., Lindner, E. et al. Chromoionophore-Mediated Imaging of Water Transport in Ion-Selective Membranes. ANAL. SCI. 14, 57–61 (1998). https://doi.org/10.2116/analsci.14.57
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DOI: https://doi.org/10.2116/analsci.14.57