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Mechanics of a process to assemble microspheres on a patterned electrode

Appl. Phys. Lett. 88, 144101 (2006); doi:10.1063/1.2191743

Published 3 April 2006

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Ting Zhu and Zhigang Suo
Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138

Adam Winkleman and George M. Whitesides
Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
A process has been demonstrated recently to assemble microspheres on a patterned electrode under the influence of an applied voltage. Here we examine the mechanics of this process, and describe both the conditions under which excess microspheres jump off the electrode when the voltage is applied, and the forces that attract the remaining microspheres to the desired positions. A quantitative mechanistic understanding of this process rationalizes experimental observations, provides scaling relations, and suggests modifications of the process. ©2006 American Institute of Physics
History: Received 11 December 2005; accepted 15 February 2006; published 3 April 2006
Permalink: http://link.aip.org/link/?APPLAB/88/144101/1
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ISSN:
0003-6951 (print)   1077-3118 (online)
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