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Dielectric model for analyzing concentration polarization and its application to organic-inorganic hybrid exchange membrane-solution system

Authors： NI Guizhi1, ZHAO kongshuang1*, LI Yuhong2, WU Yonghui3, XU Tongwen3

Units： 1. College of Chemistry, Beijing Normal University, Beijing 100875; 2. School of Chemistry and Material Engineering, Changshu Institute of Technology, Changshu, 215500; 3. Lab of Funetional Membrane, Departm entof Chemistry, University of science and Teehnology of China, Hefei 230026

KeyWords： Hybrid exchange membrane; Dielectric measurements; Direct current bias; Concentration polarization layer

ClassificationCode：O63；TQ028

year,volume(issue):pagination： 2014,34(3):8-14

Abstract：

The dielectric spectra of five kinds of organic-inorganic hybrid exchange membranes under the application of direct current bias(DC Bias) were studied over a frequence range of 40Hz-10MHz. The dielectric relaxation was not observed without DC bias, whereas when the DC bias was added, a distinct relaxation phenomenons were observed. This is attributed to concentration polarization layer nearby the membranes. The thickness of concentration polarization layer and conductance of solution were calculated by the dielectric model established by us earlier. According to the comparison of the results, the material of membrane, charge and swelling ratio of different ion-exchange membranes may have influence on the thickness of concentration polarization layer.

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Funds：

国家自然科学基金基金资助项目（20976015）

AuthorIntro：

倪贵智（1985－），女，河北衡水人，硕士研究生现从事纳滤膜介电研究通讯联系人：赵孔双，Email： zhaoks@bnu.edu.cn niguizhi2003@sina.com 联系人的电话是5880828

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