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27 Aug 2012

Volume 101, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 101, 091102 (2012); http://dx.doi.org/10.1063/1.4747168 (3 pages)

Hagay Shpaisman, Bhaskar Jyoti Krishnatreya, and David G. Grier
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Electrowetting control of bouncing jets

Xavier Noblin and Franck Celestini

Appl. Phys. Lett. 101, 094101 (2012); http://dx.doi.org/10.1063/1.4747199 (3 pages)

Online Publication Date: 27 August 2012

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As recently studied, a sub-millimetric liquid jet can bounce on sufficiently hydrophobic surfaces [F.Celestini et al., Soft Matter 6(23), 5872-5876 (2010); A. Kibar et al., Exp. Fluids 49(5), 1135-1145 (2010)]. As the hydrophobicity is reduced, the reflection angle (θr) increases and the jet rebound deviates more and more from specular reflection. In the present study, we vary the wetting properties of the substrate using the electrowetting effect to induce a change in the reflection angle. A liquid jet is sent toward a metallic surface coated by an insulating, hydrophobic layer. Applying an ac voltage between the metallic nozzle and the electrode below the insulating layer, we can precisely control the reflection angle of the jet. The effects of the amplitude and the frequency of the applied voltage are analyzed. This study can find applications for the control of jet dynamics.
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47.60.Kz Flows and jets through nozzles
47.65.-d Magnetohydrodynamics and electrohydrodynamics
68.08.Bc Wetting

A nonlinear piezoelectric energy harvester with magnetic oscillator

Lihua Tang and Yaowen Yang

Appl. Phys. Lett. 101, 094102 (2012); http://dx.doi.org/10.1063/1.4748794 (4 pages) | Cited 1 time

Online Publication Date: 27 August 2012

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This letter proposes a magnetic coupled piezoelectric energy harvester (PEH), in which the magnetic interaction is introduced by a magnetic oscillator. For comparison purpose, lumped parameter models are established for the conventional linear PEH, the nonlinear PEH with a fixed magnet, and the proposed PEH with a magnetic oscillator. Both experiment and simulation show the benefits from the dynamics of the magnetic oscillator. In the experiment, nearly 100% increase in the operating bandwidth and 41% increase in the magnitude of the power output are achieved at an excitation level of 2 m/s2.
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84.60.-h Direct energy conversion and storage
85.50.-n Dielectric, ferroelectric, and piezoelectric devices

Energy exchange during slamming impact of an ionic polymer metal composite

Y. Cha, C. N. Phan, and M. Porfiri

Appl. Phys. Lett. 101, 094103 (2012); http://dx.doi.org/10.1063/1.4748577 (4 pages) | Cited 3 times

Online Publication Date: 29 August 2012

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In this letter, we study the response of an ionic polymer metal composite to impulsive loading due to impact on the free surface of a quiescent fluid. Experiments are performed in a miniature drop tower and time-resolved particle image velocimetry is used to illustrate the flow physics of the slamming impact. Images from these experiments are used to analyze the impulsive multimodal response of the ionic polymer metal composite, which is then used to estimate the energy transferred from the slamming impact. Reduced-order modeling of the fluid-structure interaction and electromechanical behavior are used to interpret the experimental findings.
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81.70.Bt Mechanical testing, impact tests, static and dynamic loads
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