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  

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

作　　者：倪贵智[1] 赵孔双[1] 李玉红[2] 吴永会[3] 徐铜文[3] 

机构地区：[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

出　　处：《膜科学与技术》2014年第3期8-14,22,共8页Membrane Science and Technology

基　　金：国家自然科学基金资助项目(20976015)

摘　　要：在40Hz^10MHz频率范围测量了5种阴离子交换膜/0.000 1mmol/L KCl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 40 Hz-10 MHz.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.

关 键 词：杂化离子交换膜 介电测量 直流偏压 浓差极化层 

分 类 号：TQ051.893[化学工程]