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Title: Ultrasonic particle trapping in microfluidic devices using soft lithography
Authors: Guo, S
Zhao, L
Zhang, K
Lam, KH
Lau, ST
Zhao, X
Wang, Y 
Chan, HLW 
Chen, Y
Baigl, D
Keywords: Microchannel flow
Micromechanical resonators
Particle size
Piezoelectric transducers
Soft lithography
Ultrasonic waves
Issue Date: 28-May-2008
Publisher: American Institute of Physics
Source: Applied physics letters, 28 May 2008, v. 92, 213901, p. 1-3 How to cite?
Journal: Applied physics letters 
Abstract: We report on the feasible fabrication of microfluidic devices for noncontact particle trapping. A half-wavelength resonator was constructed using standard soft lithography to generate ultrasonic standing waves through a miniature piezoelectric transducer. Microparticles (400 nm to 10 µm in diameter) flowing through polydimethylsiloxane microchannels were efficiently trapped to levitate in the middle depth of a resonance cavity. Such a device could potentially offer a flexible platform for particle-based assays for a large variety of applications.
ISSN: 0003-6951
Rights: © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in S.S. Guo et al. Appl. Phys. Lett. 92, 213901 (2008) and may be found at
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