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12 Oct 2009

Volume 95, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 95, 153101 (2009); http://dx.doi.org/10.1063/1.3244597 (3 pages)

Geunjae Kwak, Mikyung Lee, Karuppanan Senthil, and Kijung Yong
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Pressure-driven flow in parallel-plate nanochannels

ZhongQiang Zhang, HongWu Zhang, and HongFei Ye

Appl. Phys. Lett. 95, 154101 (2009); http://dx.doi.org/10.1063/1.3247892 (3 pages) | Cited 5 times

Online Publication Date: 12 October 2009

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A “channel moving” pressure-driven model is proposed to generate a constant pressure gradient in fluid flow. Classical molecular dynamics simulations are carried out to explore the pressure-driven flow in parallel-plate nanochannels with the channel width ranging from 2.611 to 5.595 nm. Considering the slip boundary conditions, relationships among the pressure gradient, mean flow velocity, and the channel width are investigated to couple the atomistic regime to continuum. The results indicate that the pressure-driven flows confined in nanochannels modeled in our simulations can be approximately described by the Navier–Stokes equations while the approximate accuracy increases with enlarging the channel width.
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47.10.ad Navier-Stokes equations
47.11.Mn Molecular dynamics methods
47.60.Dx Flows in ducts and channels

Efficient evaluation of Casimir force in z-invariant geometries by integral equation methods

Jie L. Xiong and Weng Cho Chew

Appl. Phys. Lett. 95, 154102 (2009); http://dx.doi.org/10.1063/1.3242417 (3 pages) | Cited 1 time

Online Publication Date: 13 October 2009

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We introduce an efficient and accurate way to evaluate the Casimir force [ H. B. G. Casimir, Proc. K. Ned. Akad. Wet. 51, 793 (1948) ] between arbitrary z-invariant structures using integral equation method. It casts the evaluation of mean Maxwell stress tensor to a series of traditional two-dimensional electromagnetic scattering problems. The number of times that the scattering problem needs to be solved is independent of the number of unknowns.
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12.20.Ds Specific calculations
02.30.Rz Integral equations
02.40.-k Geometry, differential geometry, and topology

Stretchable metal-elastomer nanovoids for tunable plasmons

Robin M. Cole, Sumeet Mahajan, and Jeremy J. Baumberg

Appl. Phys. Lett. 95, 154103 (2009); http://dx.doi.org/10.1063/1.3247966 (3 pages) | Cited 11 times

Online Publication Date: 14 October 2009

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A range of flexible metal-elastomer nanostructures are fabricated using a self-assembly and casting technique. Such nanostructures support plasmons, which have energies and field distributions that are strongly dependent on the structure geometry or position within an array. In particular, truncated spherical metal cavities embedded within a flexible three-dimensional elastomer film can be elastically deformed without tearing, modifying their shape and mechanically tuning their resonant plasmon modes. Such structures make possible the fabrication of low cost elasto-optic films and tunable substrates for surface enhanced Raman spectroscopy.
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81.16.Dn Self-assembly
62.23.St Complex nanostructures, including patterned or assembled structures
62.25.-g Mechanical properties of nanoscale systems
73.22.Lp Collective excitations
78.30.Er Solid metals and alloys
78.30.Jw Organic compounds, polymers

Discrete microfluidics: Reorganizing droplet arrays at a bend

Enkhtuul Surenjav, Stephan Herminghaus, Craig Priest, and Ralf Seemann

Appl. Phys. Lett. 95, 154104 (2009); http://dx.doi.org/10.1063/1.3240883 (3 pages) | Cited 4 times

Online Publication Date: 14 October 2009

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Microfluidic manipulation of densely packed droplet arrangements (i.e., gel emulsions) using sharp microchannel bends was studied as a function of bend angle, droplet volume fraction, droplet size, and flow velocity. Emulsion reorganization was found to be specifically dependent on the pathlength that the droplets are forced to travel as they navigate the bend under spatial confinement. We describe how bend-induced droplet displacements might be exploited in complex, droplet-based microfluidics.
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47.61.-k Micro- and nano- scale flow phenomena
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.57.Bc Foams and emulsions
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