Lu Fuzhi, How Tuck Y, Kwok Daniel Y
Nanoscale Technology and Engineering Laboratory, Department of Mechanical Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
J Colloid Interface Sci. 2006 Jul 15;299(2):972-6. doi: 10.1016/j.jcis.2006.03.014. Epub 2006 May 2.
An improved method based on streaming potential and streaming current was proposed to determine zeta potential and surface conductance of porous material simultaneously. In the electrokinetic generation mode, a resistor is connected to the generator and by measuring the voltage drop across resistors with different resistance, a true streaming current can be determined. The zeta potential and surface conductivity can be obtained simultaneously from their relation to streaming potential and streaming current. The electrode and ion concentration polarization effects during the measurement were also discussed. The resistance from channel ends to electrodes, which has typically been ignored in the literature, was shown to have a significant influence on the calculated zeta potential and surface conductance. Ignorance of this resistance would lead to underestimation of both zeta potential and surface conductance values.
提出了一种基于流动电势和流动电流的改进方法，用于同时测定多孔材料的ζ电位和表面电导率。在电动产生模式下，将一个电阻连接到发生器上，通过测量不同电阻的电阻两端的电压降，可以确定真实的流动电流。ζ电位和表面电导率可以从它们与流动电势和流动电流的关系中同时获得。还讨论了测量过程中的电极和离子浓度极化效应。文献中通常忽略的通道末端到电极的电阻，被证明对计算得到的ζ电位和表面电导率有显著影响。忽略这种电阻会导致ζ电位和表面电导率值的低估。
