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11 Oct 2010

Volume 97, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 97, 154101 (2010); http://dx.doi.org/10.1063/1.3479052 (3 pages)

Younggeun Park, Yeonho Choi, Debkishore Mitra, Taewook Kang, and Luke P. Lee
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Study of microscale hydraulic jump phenomenon for hydrodynamic trap-and-release of microparticles

Younggeun Park, Yeonho Choi, Debkishore Mitra, Taewook Kang, and Luke P. Lee

Appl. Phys. Lett. 97, 154101 (2010); http://dx.doi.org/10.1063/1.3479052 (3 pages)

Online Publication Date: 11 October 2010

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Easy trap-and-release of microparticles is necessary to study biological cellular behavior. The hydraulic jump phenomenon inspired us to conceive a microfluidic device for the hydrodynamic trap-and-release of microparticles. A sudden height increase in a microfluidic channel leads to a dramatic decrease in flow velocity, allowing effective trapping of the microparticles by energy conversion. The trapped particles can be released by stronger inertial force based on simply increasing the flow velocity. We present a systematic, numerical study of trap-and-release of the microparticles using multiphase Navier–Stokes equations. Effect of geometry flow velocity, particle diameter, and adhesion force on trap-and-release was studied.
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87.80.Ek Mechanical and micromechanical techniques
87.17.-d Cell processes
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.85.Np Fluidics
47.61.-k Micro- and nano- scale flow phenomena
47.10.ad Navier-Stokes equations

Geometrical phase transition on WO3 surface

Abbas Ali Saberi

Appl. Phys. Lett. 97, 154102 (2010); http://dx.doi.org/10.1063/1.3502568 (3 pages) | Cited 1 time

Online Publication Date: 12 October 2010

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A topographical study on an ensemble of height profiles obtained from atomic force microscopy techniques on various independently grown samples of tungsten oxide WO3 is presented by using ideas from percolation theory. We find that a continuous “geometrical” phase transition occurs at a certain critical level-height δc below which an infinite island appears. By using the finite-size scaling analysis of three independent percolation observables, i.e., percolation probability, percolation strength, and the mean island-size, we compute some critical exponents which characterize the transition. Our results are compatible with those of long-range correlated percolation. This method can be generalized to a topographical classification of rough surface models.
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68.35.Rh Phase transitions and critical phenomena
68.35.bt Other materials
68.37.Ps Atomic force microscopy (AFM)
05.70.Jk Critical point phenomena
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