膜科学与技术

浓差极化介电模型对有机-无机杂化阴离子交换膜/电解质溶液体系的适用

作者：倪贵智¹ 赵孔双¹ 李玉红² 吴永会³ 徐铜文³

单位： 1. 北京师范大学化学学院, 北京, 100875; 2.常熟理工学院化学与材料工程学院, 常熟, 215500; 3. 中国科学技术大学化学与材料科学学院, 合肥, 230026

关键词：杂化离子交换膜，介电测量；直流偏压，浓差极化层

出版年,卷(期):页码： 2014,34(3):8-14

摘要：

在40 Hz～10 MHz频率范围测量了五种阴离子交换膜/0.0001mMKCl溶液体系有无直流偏压下的介电谱，发现只有当给这些体系施加直流偏压时才有介电现象，而且弛豫强度和直流偏压大小有关。利用浓度极化层介电模型解析介电谱获得了各体系组成相特别是和浓差极化层相关的参数。也考察了无机组分、离子基团和膜材料对膜的电性能和浓差极化层的影响。

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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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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