Effects of double-layer polarization and electroosmotic flow on the electrophoresis of an ellipsoid in a spherical cavity

The Journal of Physical Chemistry. B
Jyh-Ping Hsu, Zheng-Syun Chen

Abstract

The electrophoresis of a rigid, positively charged ellipsoidal particle at the center of a spherical cavity is investigated theoretically under the conditions where the effects of double-layer polarization and the presence of an electroosmotic flow can be important. The equations governing the problem under consideration and the associated boundary conditions are solved numerically, and the influences of the key parameters on the electrophoretic mobility of the particle are discussed. We show that if the cavity is uncharged, the effect of double-layer polarization yields a local minimum in the electrophoretic mobility as the thickness of the double layer varies. This local minimum disappears if the cavity is also positively charged. In addition to reducing the scaled mobility of an ellipsoid, the presence of the boundary is also capable of influencing the relative magnitudes of the scaled mobility for particles of various shapes. For instance, if the volume of an ellipsoid is fixed, the scaled mobility ranks as prolate > sphere > oblate if the boundary effect is unimportant, but that order is reversed if the boundary effect is important.

References

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Dec 10, 1997·Journal of Chromatography. B, Biomedical Sciences and Applications·D Corradini
Dec 16, 1998·Journal of Colloid and Interface Science·E LeeJ P Hsu
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May 14, 2003·Journal of Colloid and Interface Science·Cheng Pang TungJyh Ping Hsu
Apr 20, 2005·Journal of Colloid and Interface Science·Shih-Han LouJyh-Ping Hsu
Jul 27, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Jyh-Ping HsuChao-Chung Kuo
Dec 31, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·S Chodankar, V K Aswal
Jul 13, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·M G BasavarajJ Vermant
Oct 31, 2006·Journal of Colloid and Interface Science·Jyh-Ping HsuMing-Hong Ku
Feb 20, 2007·Journal of Colloid and Interface Science·Jyh-Ping HsuZheng-Syun Chen

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Citations

Oct 7, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Jyh-Ping Hsu, Yi-Hsuan Tai

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