Streaming potentials of nuclepore membranes by the electric work method

被引:14
作者
Brendler, E
Ratkje, SK
Hertz, HG
机构
[1] UNIV TRONDHEIM,NORWEGIAN INST TECHNOL,INST CHEM PHYS,N-7034 TRONDHEIM,NORWAY
[2] TU BERGAKAD FREIBERG,INST ANALYT CHEM,D-09599 FREIBERG,GERMANY
[3] UNIV KARLSRUHE,INST PHYS CHEM & ELECTROCHEM,D-76128 KARLSRUHE,GERMANY
关键词
electric work method; streaming potential; Nuclepore membranes;
D O I
10.1016/0013-4686(95)00112-R
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Streaming potential measurements have been carried out on NUCLEPORE polycarbonate membranes with pore diameters between 0.015 and 1.0 mu m, equilibrated in KCl or NaCl solutions. Three types of membrane behavior can be seen from the variation of emf with time. Concentration polarization across the membrane is significant for a membrane with pore diameter of 0.015 mu m. For membranes with pore diameters between 0.015 and 0.6 mu m, the emf rises rapidly towards a stable value when a pressure difference is applied. In membranes with pore diameters between 0.6 and 1 mu m, the high liquid velocity alters the interactions at the wall during the course of measurement, and this is reflected in a decreasing emf with time. Some results obtained by varying pore radius and concentration agree with previous studies. Our results, as well as results reported in the literature, are interpreted in terms of a new theoretical method; the electric work method. Electric work is produced for positive liquid velocity, consistent with momentum production at the membrane wall during the measurement. A relation between the magnitude of layer where momentum transfer takes place and the streaming potential can be applied. Momentum transfer at the membrane wall may extend about 0.1 mu m into the pore.
引用
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页码:169 / 176
页数:8
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