Authors Yang, J. ; Grundke, K. ; Bellmann, C. ; Michel, S. ; Kostiuk, L.W. ; Kwok, D.Y.
Title Oscillating Streaming Potential and Electro-osmosis of Multilayer Membranes
Date 14.12.2004
Number 11589
Abstract Artificial membranes consist of multilayers that have different physical or chemical properties. They areoften considered as an equivalent single-layer membrane without taking into account the detail inside. Basedon the Debye-Hückel approximation, we have provided analytical solutions of oscillating electrokinetic flowin multilayer membranes. Both pressure-driven flow (streaming potential) and electric-field-driven flow (electro-osmosis) were studied. The pressure and electric-field distributions in each layer can be obtained from ouranalytical solutions. This allows a better understanding of electrokinetic flow in multilayer membranes andbenefits the design and selection of artificial membranes. The derived analytical solutions are useful for more-general time-dependent problems through a superposition of time-harmonic solutions weighted by appropriateFourier coefficients. The properties of each membrane layer are reflected as complex quantities; therefore, amethod is proposed to determine the electrokinetic properties (such as the zeta potential) of each layer byapplying a high-frequency alternating electric field or pressure.
Publisher Journal of Physical Chemistry / B
Citation Journal of Physical Chemistry / B 108 (2004) 2103-2110

Back to list