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31 May 2010

Volume 96, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 96, 223101 (2010); http://dx.doi.org/10.1063/1.3439728 (3 pages)

Seokho Yun, Jeremy A. Bossard, Theresa S. Mayer, and Douglas H. Werner
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Hydrodynamic trap for single particles and cells

Melikhan Tanyeri, Eric M. Johnson-Chavarria, and Charles M. Schroeder

Appl. Phys. Lett. 96, 224101 (2010); http://dx.doi.org/10.1063/1.3431664 (3 pages) | Cited 14 times

Online Publication Date: 2 June 2010

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Trapping and manipulation of microscale and nanoscale particles is demonstrated using the sole action of hydrodynamic forces. We developed an automated particle trap based on a stagnation point flow generated in a microfluidic device. The hydrodynamic trap enables confinement and manipulation of single particles in low viscosity (1–10 cP) aqueous solution. Using this method, we trapped microscale and nanoscale particles (100 nm–15 μm) for long time scales (minutes to hours). We demonstrate particle confinement to within 1 μm of the trap center, corresponding to a trap stiffness of ∼ 10−5–10−4 pN/nm.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
66.20.-d Viscosity of liquids; diffusive momentum transport
47.61.Jd Multiphase flows
47.55.Kf Particle-laden flows
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