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25 Jul 2011

Volume 99, Issue 4, Articles (04xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 041102 (2011); http://dx.doi.org/10.1063/1.3615051 (3 pages)

M. Davanço, M. T. Rakher, D. Schuh, A. Badolato, and K. Srinivasan
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Inertial focusing of non-spherical microparticles

Soojung Claire Hur, Sung-Eun Choi, Sunghoon Kwon, and Dino Di Carlo

Appl. Phys. Lett. 99, 044101 (2011); http://dx.doi.org/10.1063/1.3608115 (3 pages) | Cited 4 times

Online Publication Date: 29 July 2011

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We have investigated the focusing and dynamics of non-spherical polymeric particles in microfluidic flows at finite Reynolds number. The rotational diameter, Dmax, of a particle, regardless of its cross-sectional shape, was found to determine the final focused position, except for the case of asymmetric disks. Additionally, elongated particles with larger Dmax exhibited longer residence times in a horizontal orientation than those with smaller Dmax. These findings inform approaches to hydrodynamically control shaped and barcoded particles for multiplexed biochemical assays.
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87.15.H- Dynamics of biomolecules
87.15.R- Reactions and kinetics
47.63.-b Biological fluid dynamics
47.85.Np Fluidics
87.15.B- Structure of biomolecules

Temperature induced transition from hexagonal to circular pits in graphite oxidation by O2

Arnaud Delehouzé, Francis Rebillat, Patrick Weisbecker, Jean-Marc Leyssale, Jean-Francois Epherre, Christine Labrugère, and Gérard L. Vignoles

Appl. Phys. Lett. 99, 044102 (2011); http://dx.doi.org/10.1063/1.3615801 (3 pages)

Online Publication Date: 29 July 2011

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We report on an in-situ monitoring of graphite oxidation using a high temperature environmental scanning electron microscope. A morphological transition is clearly identified around 1040 K between hexagonal pits at low temperatures and circular pits at high temperatures, with apparently no change in the kinetic law. A kinetic Monte Carlo model allows rationalizing these findings in terms of the competitive oxidation of armchair and zig-zag edge sites and provides an estimate of the rate laws associated to these two events. Extended to three dimensions, the model also explains the “in-depth” transition between the stepwise hexagons and the hemispheres observed by atomic force microscopy.
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64.70.K- Solid-solid transitions
81.30.Hd Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder

Reconfigurable gradient index using VO2 memory metamaterials

M. D. Goldflam, T. Driscoll, B. Chapler, O. Khatib, N. Marie Jokerst, S. Palit, D. R. Smith, Bong-Jun Kim, Giwan Seo, Hyun-Tak Kim, M. Di Ventra, and D. N. Basov

Appl. Phys. Lett. 99, 044103 (2011); http://dx.doi.org/10.1063/1.3615804 (3 pages) | Cited 9 times

Online Publication Date: 29 July 2011

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We demonstrate tuning of a metamaterial device that incorporates a form of spatial gradient control. Electrical tuning of the metamaterial is achieved through a vanadium dioxide layer which interacts with an array of split ring resonators. We achieved a spatial gradient in the magnitude of permittivity, writeable using a single transient electrical pulse. This induced gradient in our device is observed on spatial scales on the order of one wavelength at 1 THz. Thus, we show the viability of elements for use in future devices with potential applications in beamforming and communications.
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42.70.-a Optical materials
81.05.Xj Metamaterials for chiral, bianisotropic and other complex media

Microelectromechanical resonators based on an all polymer/carbon nanotube composite structural material

P. M. Sousa, M. Gutiérrez, E. Mendoza, A. Llobera, V. Chu, and J. P. Conde

Appl. Phys. Lett. 99, 044104 (2011); http://dx.doi.org/10.1063/1.3621861 (3 pages) | Cited 3 times

Online Publication Date: 29 July 2011

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Carboxylated multi-wall carbon-nanotubes (CNTs) monolayers are integrated on microfabricated all-polymer micro-electromechanical systems (pMEMS) resonator bridges on glass substrates. The structural layer of the MEMS bridges is a multilayer blended conductive polymer based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) to which functionalized CNT monolayers are electrostatically attached. The resonance frequency (fres) of electrostatically actuated pMEMS bridges was measured as a function of their length (32–67 μm) for different multilayer compositions. A significant increase in fres and quality factor (Q) with the addition of CNT monolayers to the PEDOT:PSS structural material is observed, demonstrating that CNT monolayers can be used to modulate pMEMS resonator properties.
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07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
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