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15 Mar 2010

Volume 96, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 96, 111901 (2010); http://dx.doi.org/10.1063/1.3358107 (3 pages)

B. Rožič, S. Krause, H. Finkelmann, G. Cordoyiannis, and Z. Kutnjak
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Superhydrophilicity to superhydrophobicity transition of CuO nanowire films

Feng-Ming Chang, Shao-Liang Cheng, Siang-Jie Hong, Yu-Jane Sheng, and Heng-Kwong Tsao

Appl. Phys. Lett. 96, 114101 (2010); http://dx.doi.org/10.1063/1.3360847 (3 pages) | Cited 6 times

Online Publication Date: 15 March 2010

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The surface of CuO is known for its hydrophilicity and exhibits superhydrophilic nature as nanowires are present. When exposed in the air at room temperature or treated by low temperature annealing, however, transition from superhydrophilicity to superhydrophobicity of the CuO nanowire films are observed. Since the chemical structure of the films after treatment remains the same as CuO according to x-ray photoelectron spectroscopy spectra, the superhydrophobicity may be attributed to partial deoxidation of the upmost layer of CuO surfaces into Cu2O-like hydrophobic surfaces. Nonetheless, superhydrophilicity is recovered if the superhydrophobic CuO film is subject to high temperature annealing.
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68.08.Bc Wetting
68.55.-a Thin film structure and morphology
79.60.Bm Clean metal, semiconductor, and insulator surfaces
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)
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Probing long bones with ultrasonic body waves

Lawrence H. Le (黎仲勳), Yu J. Gu (谷宇), Yuping Li (李玉平), and Chan Zhang (張嬋)

Appl. Phys. Lett. 96, 114102 (2010); http://dx.doi.org/10.1063/1.3300474 (3 pages) | Cited 4 times

Online Publication Date: 16 March 2010

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This study uses seismological principles and techniques including waveform simulations and travel time calculations to reveal the nature of ultrasound wave propagation in long bones at small offsets (source-to-receiver distances) and times. Our experiments confirm the existence of reflected and converted body waves originating from wave interaction at the internal interfaces of a bone structure. We demonstrate that the bone ultrasound responses can be successfully simulated and properly interpreted based on a simple, horizontally layered approximation.
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87.50.yg Biophysical mechanisms of interaction
43.80.-n Bioacoustics

Photochromism and visible light induced H2 generation in Sr2TiO4:Cr complexes

Z. G. Yi, H. Iwai, and J. H. Ye

Appl. Phys. Lett. 96, 114103 (2010); http://dx.doi.org/10.1063/1.3360811 (3 pages) | Cited 2 times

Online Publication Date: 17 March 2010

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Sr2TiO4:Cr complexes are found to possess photochromism. After the photochromism, the catalytic performance of the complexes for H2 generation increases markedly. In fact, it was found that the performance increased more than 20 times compared to the original Sr2TiO4: 10 mol % Cr complex. These results suggest that it is worthwhile searching and optimizing visible-light-sensitive photocatalysts by investigating possible photochromism.
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78.20.-e Optical properties of bulk materials and thin films
88.30.E- Hydrogen production with renewable energy
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
82.50.Hp Processes caused by visible and UV light

Dynamic behavior of a liquid marble based accelerometer

H. Zeng and Y. Zhao

Appl. Phys. Lett. 96, 114104 (2010); http://dx.doi.org/10.1063/1.3367704 (3 pages) | Cited 4 times

Online Publication Date: 18 March 2010

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This paper reports dynamic behavior of a liquid-state accelerometer prototype, which uses a liquid marble as the inertial proof mass. The governing equation is developed in comparison with the solid-state proof mass in a conventional accelerometer. Numerical analysis and experimental validation show that with appropriate parameters, resonance frequency of the sensor can be designed below 10 Hz, which falls into the range of low frequency body motion. The work provides the basis for development of a new paradigm of motion sensing with reduced fabrication and assembly complexity, which is promising for next generation accelerometers for low frequency motion detection.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
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