Micromachined Linear Brownian Motor: Transportation of Nanobeads by Brownian Motion Using Three-Phase Dielectrophoretic Ratchet
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概要
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Nanosystems operating in liquid media may suffer from random Brownian motion due to thermal fluctuations. Biomolecular motors exploit these random fluctuations to generate a controllable directed movement. Inspired by nature, we proposed and realized a nano-system based on Brownian motion of nanobeads for linear transport in microfluidic channels. The channels limit the degree-of-freedom of the random motion of beads into one dimension, which was rectified by a three-phase dielectrophoretic ratchet biasing the spatial probability distribution of the nanobead towards the transportation direction. We micromachined the proposed device and experimentally traced the rectified motion of nanobeads and observed the shift in the bead distribution as a function of applied voltage. We identified three regions of operation; (1) a random motion region, (2) a Brownian motor region, and (3) a pure electric actuation region. Transportation in the Brownian motor region required less applied voltage compared to the pure electric transport.
- 2008-11-25
著者
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Fujita Hiroyuki
Center For International Research On Micromechatronics (cirmm) Institute Of Industrial Science (iis)
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Altintas Ersin
Center for International Research on Micro-Mechatronics, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Bohringer Karl
Department of Electrical Engineering, The University of Washington, Box 352500, 234 Electrical Engineering/Computer Science Engineering Building, Seattle, WA 98195-2500, U.S.A.
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Fujita Hiroyuki
Center for International Research on Micro-Mechatronics, Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Fujita Hiroyuki
Center for International Research on Micro Mecharonics, Institute of Industrial Science, University of Tokyo, Meguro, Tokyo 153-8505, Japan
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Fujita Hiroyuki
Center for International Research on Micro Mechanics, Institute of Industrial Science, The University of Tokyo
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