Chromoionophore-Mediated Imaging of Water Transport in Ion-Selective Membranes.

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  • ZWICKL Titus
    Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH)
  • SCHNEIDER Bernhard
    Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH)
  • LINDNER Ernö
    Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH)
  • SOKALSKI Tomasz
    Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH)
  • SCHALLER Ulrich
    Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH)
  • PRETSCH Ernö
    Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH)

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タイトル別名
  • Chromoionophore-Mediated Imaging of Wat

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抄録

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, DH2O*, 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.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 14 (1), 57-61, 1998

    社団法人 日本分析化学会

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