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14 Jan 2013

Volume 102, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 102, 023901 (2013); http://dx.doi.org/10.1063/1.4773526 (4 pages)

Yoshihiro Gohda and Shinji Tsuneyuki
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Electrohydrodynamic printing under applied pole-type nozzle configuration

Lei Xu and Daoheng Sun

Appl. Phys. Lett. 102, 024101 (2013); http://dx.doi.org/10.1063/1.4775672 (3 pages)

Online Publication Date: 14 January 2013

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A pole-type nozzle has an inserted pole that jams a contraction flow into capillary in electrohydrodynamic deposition. The jammed solution improves Taylor cone formation by shortening the hysteresis time so that pole-type nozzle is suitable for high-resolution electrohydrodynamic printing. Experimental results demonstrate a governed frequency-dividing relationship with an integral ratio of applied voltage frequency to droplet deposition frequency. It is observed that low integral frequency ratio is in favor of low voltage amplitude and duty cycle, and high voltage frequency, since polymer solution jets in a small fluidic volume per droplet under low electric force and short pulse duration.
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47.65.-d Magnetohydrodynamics and electrohydrodynamics
47.60.Kz Flows and jets through nozzles
47.55.D- Drops and bubbles
47.57.Ng Polymers and polymer solutions

Metamaterial-based half Maxwell fish-eye lens for broadband directive emissions

Abdallah Dhouibi, Shah Nawaz Burokur, André de Lustrac, and Alain Priou

Appl. Phys. Lett. 102, 024102 (2013); http://dx.doi.org/10.1063/1.4776662 (4 pages)

Online Publication Date: 16 January 2013

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The broadband directive emission from a metamaterial surface is numerically and experimentally reported. The metasurface, composed of non-resonant complementary closed ring structures, is designed to obey the refractive index of a half Maxwell fish-eye lens. A planar microstrip Vivaldi antenna is used as transverse magnetic polarized wave launcher for the lens. A prototype of the lens associated with its feed structure has been fabricated using standard lithography techniques. To experimentally demonstrate the broadband focusing properties and directive emissions, both the far-field radiation patterns and the near-field distributions have been measured. Measurements agree quantitatively and qualitatively with theoretical simulations.
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42.79.Bh Lenses, prisms and mirrors
42.79.Ry Gradient-index (GRIN) devices
84.40.Ba Antennas: theory, components and accessories
42.70.-a Optical materials

Multi-modal characterization of nanogram amounts of a photosensitive polymer

Seonghwan Kim, Dongkyu Lee, Minhyuk Yun, Namchul Jung, Sangmin Jeon, and Thomas Thundat

Appl. Phys. Lett. 102, 024103 (2013); http://dx.doi.org/10.1063/1.4788740 (4 pages) | Cited 1 time

Online Publication Date: 18 January 2013

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Here, we demonstrate multi-modal approach of simultaneous characterization of poly(vinyl cinnamate) (PVCN) using a microcantilever sensor. We integrate nanomechanical thermal analysis with photothermal cantilever deflection spectroscopy for discerning ultraviolet (UV) exposure-induced variations in the thermodynamic and thermomechanical properties of the PVCN as a function of temperature and UV irradiation time. UV radiation-induced photo-cross-linking processes in the PVCN are verified with the increase of the Young's modulus and cantilever deflection as well as the decrease in the hysteresis of deflection and the intensity of C=C peak in the nanomechanical infrared spectrum as a function of UV irradiation time.
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65.40.G- Other thermodynamical quantities
78.35.+c Brillouin and Rayleigh scattering; other light scattering
81.40.Gh Other heat and thermomechanical treatments
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.de Elastic moduli
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