Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Electrophoretic Levitation and Focusing of Particles by Field Switching
Mikinori YAMADAMakoto HARADATetsuo OKADA
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JOURNALS FREE ACCESS

2009 Volume 25 Issue 2 Pages 279-284

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Abstract

An electric field parallel to electrode arrays, which can be realized by switching DC electric fields, allows the electrophoretic levitation and focusing of negatively charged particles at the height of the anodes in the electrode arrays. Electric field calculations predict that charged particles will migrate parallel to the electrode array. The trajectories of particles well reflect the calculated electrical field. The present principle is also applied to the focusing and sweeping of the particles. Results obtained with varying experimental variables indicate that an increase in applied voltage results in a linear increase in an initial focusing rate but lowers the focusing efficiency. Also, the focusing efficiency is enhanced with decreasing intervals of field-switching. These results strongly suggest that the elimination of the large lateral movements of particles is important to attain high focusing efficiency.

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© 2009 by The Japan Society for Analytical Chemistry
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