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Electrokinetic particle entry into microchannels
Zhu JJ; Hu GQ(胡国庆); Xuan XC; Hu, GQ; Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
AbstractThe fundamental understanding of particle electrokinetics in microchannels is relevant to many applications. To date, however, the majority of previous studies have been limited to particle motion within the area of microchannels. This work presents the first experimental and numerical investigation of electrokinetic particle entry into a microchannel. We find that the particle entry motion can be significantly deviated from the fluid streamline by particle dielectrophoresis at the reservoir-microchannel junction. This negative dielectrophoretic motion is induced by the inherent non-uniform electric field at the junction and is insensitive to the microchannel length. It slows down the entering particles and pushes them toward the center of the microchannel. The consequence is the demonstrated particle deflection, focusing, and trapping phenomena at the reservoir-microchannel junction. Such rich phenomena are studied by tuning the AC component of a DC-biased AC electric field. They are also utilized to implement a selective concentration and continuous separation of particles by size inside the entry reservoir.
KeywordElectrokinetics Microfluidics Dielectrophoresis Reservoir Electrophoretic Motion Electroosmotic Flow Spherical-particle Cylindrical Pore Dielectrophoretic Force Colloidal Sphere Double-layer Separation Transport Capillary
Subject Area微机电系统中的流体力学问题
Indexed BySCI
WOS IDWOS:000303155700005
Funding OrganizationThis work was supported by NSF under Grant No. CBET-0853873 and by Clemson University through a start-up package to X. Xuan. The support from the National 973 Project (Grant No 2011CB707604), NSFC (Grant No 50890182), and Knowledge Innovation Program of CAS (KJCX2-YW-H18) to G. Hu is also gratefully appreciated.
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Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHu, GQ; Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Zhu JJ,Hu GQ,Xuan XC,et al. Electrokinetic particle entry into microchannels[J]. ELECTROPHORESIS,2012,33(6):916-922.
APA Zhu JJ,胡国庆,Xuan XC,Hu, GQ,&Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China..(2012).Electrokinetic particle entry into microchannels.ELECTROPHORESIS,33(6),916-922.
MLA Zhu JJ,et al."Electrokinetic particle entry into microchannels".ELECTROPHORESIS 33.6(2012):916-922.
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