| Hydrodynamic Tweezers: Impact of Design Geometry on Flow and Microparticle Trapping. | |
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MedLine Citation:
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PMID: 22276579 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Here we explore the role of microfabricated device geometry on frequency-dependent low Reynolds number steady streaming flow and particle trapping behavior. In our system, flow and particle trapping is induced near an obstruction or cavity located in an otherwise rectilinear oscillating flow of frequency ω and amplitude s in a fluid of kinematic viscosity ν. Here we expand prior studies to characterize 9 distinct obstruction/cavity geometries. The imaged microeddy flows show that the device geometry affects the eddy number, shape, structure, and strength. Comparison of measured particle trap locations with the computed eddy flow structure shows that particles trap closer to the wall than the eddy core. Trapping strength and location are controlled by the geometry and the oscillation frequency. In most cases, the trapping behavior is linearly proportional to the Stokes layer thickness, δAC ~ O(√(ν/ω)). We show that steady streaming in microfluidic eddies can be a flexible and versatile method for non-contact microparticle trapping, and hence we call this class of devices "hydrodynamic tweezers". |
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Authors:
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Valerie Huei-Min Lieu; Tyler Andrew House; Daniel Todd Schwartz |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-24 |
Journal Detail:
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Title: Analytical chemistry Volume: - ISSN: 1520-6882 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370536 Medline TA: Anal Chem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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