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Micromachines 2015, 6(9), 1387-1405; doi:10.3390/mi6091387

Manipulation of Self-Assembled Microparticle Chains by Electroosmotic Flow Assisted Electrorotation in an Optoelectronic Device

School of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China
Academic Editors: Wen Jung Li and Ting-Hsuan Chen
Received: 8 July 2015 / Revised: 14 September 2015 / Accepted: 14 September 2015 / Published: 21 September 2015
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Abstract

A method incorporating the optically induced electrorotation (OER) and alternating current electroosmotic (ACEO) effects, for the formation and motion control of microparticle chains, is numerically and experimentally demonstrated. In this method, both the rotating electric field and ACEO fluid roll are generated around the border between light and dark area of the fluidic chamber in an optoelectronic tweezers (OET) device. The experimental results show that the particle chains can self-rotate in their pitch axes under the rotating electric field produced due to the different impedances of the photoconductive layer in light and dark areas, and have a peak self-rotating rate at around 1 MHz. The orbital movement of entire particle chain around the center of ACEO fluid roll can be achieved from 0.5 to 600 kHz. The strength of OER motion and ACEO-caused orbital movement of particle chains can be adjusted by changing the frequency of alternating current (AC) voltage. This non-contact method has the potential for spatially regulating the posture, orientation and position of microparticle chains. View Full-Text
Keywords: electroosmotic flow; optically induced electrorotation; particle chains; optoelectronic tweezers electroosmotic flow; optically induced electrorotation; particle chains; optoelectronic tweezers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhu, X. Manipulation of Self-Assembled Microparticle Chains by Electroosmotic Flow Assisted Electrorotation in an Optoelectronic Device. Micromachines 2015, 6, 1387-1405.

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