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18 Apr 2011

Volume 98, Issue 16, Articles (16xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 163701 (2011); http://dx.doi.org/10.1063/1.3579156 (3 pages)

Thomas Jetzfellner, Amir Rosenthal, K.-H. Englmeier, Alexander Dima, Miguel Ángel Araque Caballero, Daniel Razansky, and Vasilis Ntziachristos
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Conducting interpenetrating polymer network sized to fabricate microactuators

Alexandre Khaldi, Cédric Plesse, Caroline Soyer, Eric Cattan, Frédéric Vidal, Christiane Legrand, and Dominique Teyssié

Appl. Phys. Lett. 98, 164101 (2011); http://dx.doi.org/10.1063/1.3581893 (3 pages) | Cited 5 times

Online Publication Date: 19 April 2011

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Interpenetrating polymer networks can become successful actuators in the field of microsystems providing they are compatible with microtechnologies. In this letter, we report on a material synthesized from poly(3,4-ethylenedioxythiophene) and polytetrahydrofuran/poly(ethylene oxide) and microsized by decreasing its thickness to 12 μm and patterning the lateral side using plasma etching at high etch rates and with vertical sidewalls. A chemical process and a “self degradation” are proposed to explain such etching rates. Preliminary actuation results show that microbeams can move with very large displacements. These microsized actuators are potential candidates in numerous applications, including microswitches, microvalves, microoptical instrumentation, and microrobotics.
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81.05.Cy Elemental semiconductors
61.41.+e Polymers, elastomers, and plastics
81.65.Cf Surface cleaning, etching, patterning
52.77.Bn Etching and cleaning

Surface electrophoresis of ds-DNA across orthogonal pair of surfaces

Arnab Ghosh, Tarak K. Patra, Rishi Kant, Rajeev Kr. Singh, Jayant K. Singh, and Shantanu Bhattacharya

Appl. Phys. Lett. 98, 164102 (2011); http://dx.doi.org/10.1063/1.3565238 (3 pages) | Cited 2 times

Online Publication Date: 19 April 2011

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A gel free microchannel device made up of polydimethyl siloxane is fabricated for the surface based electrophoresis of double stranded deoxy-ribonucleic acid (DNA) molecules. In the presence of directional external electric field, DNA fragments near the corners of the microchannel are found to separate faster as compared to those over the base of the channel. This is in spite of the reduction in the mobility of molecules over the channel corners. We performed coarse grained molecular dynamics simulations which reveal that, though the adsorption energy of the DNA fragments increases near the corner, it is the increase in the relative mobility which enhances the separation of the fragments over the corner.
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87.15.Tt Electrophoresis
87.50.ch Electrophoresis/dielectrophoresis and other mechanical effects
82.45.Tv Bioelectrochemistry
87.14.gk DNA
82.39.Pj Nucleic acids, DNA and RNA bases
82.45.Jn Surface structure, reactivity and catalysis

The effects of alloying element Co on Ni–Mn–Ga ferromagnetic shape memory alloys from first-principles calculations

Jing Bai, Jean-Marc Raulot, Yudong Zhang, Claude Esling, Xiang Zhao, and Liang Zuo

Appl. Phys. Lett. 98, 164103 (2011); http://dx.doi.org/10.1063/1.3582239 (3 pages) | Cited 2 times

Online Publication Date: 22 April 2011

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The effects of Co addition on the properties of Ni8−xMn4Ga4Cox ferromagnetic shape memory alloys are systematically investigated by first-principles calculations. The formation energy results indicate that the added Co preferentially occupies the Ni sites in Ni2MnGa alloy. The total energy difference between the paramagnetic and the ferromagnetic austenite plays an important role on the Curie transformation. The electronic density of states gives rise to the difference in the magnetic properties.
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75.30.Cr Saturation moments and magnetic susceptibilities
71.15.Mb Density functional theory, local density approximation, gradient and other corrections
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.20.En Metals and alloys
71.15.Nc Total energy and cohesive energy calculations
75.50.Cc Other ferromagnetic metals and alloys

Hot spot analysis in integrated circuit substrates by laser mirage effect

X. Perpiñà, X. Jordà, M. Vellvehi, and J. Altet

Appl. Phys. Lett. 98, 164104 (2011); http://dx.doi.org/10.1063/1.3581038 (3 pages)

Online Publication Date: 22 April 2011

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This work shows an analytical and experimental technique for characterizing radial heat flow present in integrated circuits (ICs) when power is dissipated by integrated devices. The analytical model comes from the resolution of the Fermat equation for the trajectory of rays and supposing a spherical heat source dissipating a time-periodic power. An application example is presented; hence demonstrating how hot spots and heat transfer phenomena in the IC substrate can be characterized. The developed method may become a practical alternative to usual off-chip techniques for inspecting hot spots in ICs and to experimentally characterize heat flow in the semiconductor substrate.
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42.79.-e Optical elements, devices, and systems
42.82.Gw Other integrated-optical elements and systems
07.20.-n Thermal instruments and apparatus
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