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16 Jul 2007

Volume 91, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 91, 033106 (2007); http://dx.doi.org/10.1063/1.2757609 (3 pages)

S. Ingole, P. Aella, Sean J. Hearne, and S. T. Picraux
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Self-oscillation mode due to fluid-structure interaction in a micromechanical valve

Olivier Ducloux, Abdelkrim Talbi, Leticia Gimeno, Romain Viard, Philippe Pernod, Vladimir Preobrazhensky, and Alain Merlen

Appl. Phys. Lett. 91, 034101 (2007); http://dx.doi.org/10.1063/1.2752530 (3 pages) | Cited 1 time

Online Publication Date: 17 July 2007

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This letter presents an original actuation mode for a micromechanical valve based on the induction of a self-oscillation, provided by the strong coupling between a mobile mechanical part and the fluid flow. The presented structure consists of a rigid silicon pad processed on a flexible membrane, both located over a silicon microchannel with structured internal walls. A theoretical analysis, based on a combination of the small perturbations method and a numerical study, shows that a self-oscillation can be induced on the mobile part due to the hybridization of the first flexion and torsion resonance modes interacting with the gas flow. Characterization of the self-oscillating microvalve shows high performances without electric energy supply for control.
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47.35.Lf Wave-structure interactions
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)
47.60.-i Flow phenomena in quasi-one-dimensional systems
47.85.ld Boundary layer control
47.85.Np Fluidics
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Fabrication of nonaging superhydrophobic surfaces by packing flowerlike hematite particles

Anmin Cao, Liangliang Cao, and Di Gao

Appl. Phys. Lett. 91, 034102 (2007); http://dx.doi.org/10.1063/1.2766697 (3 pages) | Cited 6 times

Online Publication Date: 19 July 2007

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The authors demonstrate the fabrication of nonaging superhydrophobic surfaces by packing flowerlike micrometer-sized hematite (α-Fe2O3) particles. Although hematite is intrinsically hydrophilic, the nanometer-sized protrusions on the particles form textures with overhanging structures that prevent water from entering into the textures and induce a macroscopic superhydrophobic phenomenon. These superhydrophobic surfaces do not age even in extremely oxidative environments—they retain the superhydrophobicity after being stored in ambient laboratory air for 4 months, heated to 800 °C in air for 10 h, and exposed to ultraviolet ozone for 10 h.
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81.65.-b Surface treatments
61.41.+e Polymers, elastomers, and plastics
61.46.-w Structure of nanoscale materials
81.07.-b Nanoscale materials and structures: fabrication and characterization
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