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Impedance spectroscopic study on ionic transport in a pH sensitive membrane |
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| Authors: | Hee-Tak Kim Jung-Ki Park Kew-Ho Lee |
| Affiliation: | 1. Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 371-1, Kusung-dong, Yusung-gu, Daejon, 305–701, South Korea;2. Korea Research Institute of Chemical Technology, 100, Jang-dong, Daejon, 305–343, South Korea |
| Abstract: | The characteristics of ionic transport under the influence of an AC electric field in a pH sensitive membrane made of poly(acrylamidocaproic acid) were studied using impedance spectroscopy. The dielectric spectra were obtained at various temperatures and for a range of pH values of HCl aqueous solutions in which the membrane was equilibrated. The contribution from the ionic transport which can be identified by a power dependency on frequency (i.e. ω−n; where 0 < n < 1) in the dielectric loss spectra, provided a means of determining the tortuosity of the long range ionic transport pathways. |
| Keywords: | Impedance spectroscopy pH sensitive membrane Ionic transport Dielectric loss spectra Hydrophobic aggregation |
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