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Dielectric study on membrane adsorption and release: Relaxation mechanism and diffusion dynamics

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Abstract

Dielectric monitoring of the adsorption or release process of salicylic acid (SA) by chitosan membrane shows that the dielectric spectra of the chitosan membrane/ SA solution systems change regularly in the adsorption or release process. By analyzing the regularity, a new mechanism for the relaxations is proposed. The concentration polarization layer (CPL) caused by SA adsorption or release is confirmed to be essential for the dielectric relaxations. The changes of the spectra with time are explained by account of the relationship between CPL properties and dielectric strength. Based on this relaxation mechanism, a theoretical method can be established to calculate dynamical parameters of inner structure of the adsorption or release systems from their dielectric spectra. Therefore, dielectric spectroscopy is demonstrated to be a promising method for estimating interfacial distribution of ionic substances and their binding to membrane in a non-invasive way.

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Authors and Affiliations

  1. Jiangsu Laboratory of Advanced Functional Materials, Department of Chemistry and Material Engineering, Changshu Institute of Technology, Changshu, 215500, China

    YuHong Li

  2. College of Chemistry, Beijing Normal University, Beijing, 100875, China

    KongShuang Zhao & Ying Han

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  1. YuHong Li
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  2. KongShuang Zhao
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  3. Ying Han
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Correspondence to KongShuang Zhao.

Additional information

Supported by the National Natural Science Foundation of China (Grant No. 20673014) and Open Topic Research Foundation of Jiangsu Laboratory of Advanced Functional Materials (No. 06KFJJ009)

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Li, Y., Zhao, K. & Han, Y. Dielectric study on membrane adsorption and release: Relaxation mechanism and diffusion dynamics. Sci. China Ser. B-Chem. 51, 813–822 (2008). https://doi.org/10.1007/s11426-008-0037-0

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  • DOI: https://doi.org/10.1007/s11426-008-0037-0

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