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.
出处
《膜科学与技术》
CAS
CSCD
北大核心
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)
关键词
杂化离子交换膜
介电测量
直流偏压
浓差极化层
hybrid exchange membrane
dielectric measurements
direct current bias
concentration polarization layer
