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21 May 2012

Volume 100, Issue 21, Articles (21xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 213701 (2012); http://dx.doi.org/10.1063/1.3701135 (4 pages)

Wen Lo, Ara Ghazaryan, Chien-Hsin Tso, Po-Sheng Hu, Wei-Liang Chen, Tsung-Rong Kuo, Sung-Jan Lin, Shean-Jen Chen, Chia-Chun Chen, and Chen-Yuan Dong
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Structural properties of rutile TiO2 nanoparticles accumulated in a model of gastrointestinal epithelium elucidated by micro-beam x-ray absorption fine structure spectroscopy

G. Veronesi, E. Brun, B. Fayard, M. Cotte, and M. Carrière

Appl. Phys. Lett. 100, 214101 (2012); http://dx.doi.org/10.1063/1.4720172 (4 pages)

Online Publication Date: 21 May 2012

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Micro-beam x-ray absorption fine structure spectroscopy was used to investigate rutile TiO2 nanoparticles internalized into gastrointestinal cells during their crossing of a gut model barrier. Nanoparticles diluted in culture medium tend to accumulate in cells after 48 h exposure; however, no spectral differences arise between particles in cellular and in acellular environments, as corroborated by quantitative analysis. This finding establishes that no modification of the lattice properties of the nanoparticles occurs upon interaction with the barrier. These measurements demonstrate the possibility of interrogating nanoparticles in situ within cells, suggesting a way to investigate their fate when incorporated in biological hosts.
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87.90.+y Other topics in biological and medical physics (restricted to new topics in section 87)
87.16.Uv Active transport processes
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

Broadband aperiodic air coupled ultrasonic lens

John T. Welter, Shamachary Sathish, Josiah M. Dierken, Philip G. Brodrick, Matthew R. Cherry, and Jason D. Heebl

Appl. Phys. Lett. 100, 214102 (2012); http://dx.doi.org/10.1063/1.4720149 (3 pages)

Online Publication Date: 22 May 2012

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This paper demonstrates the possibility of subwavelength, defined as less than the incident wavelength, broadband focusing in an aperiodic air coupled ultrasonic lens. A near field probe is used to detect well defined resonances from 75 to 125 kHz. The spatial resolution at each of the resonant frequencies is determined and demonstrated to be smaller than the wavelength of the ultrasonic waves. The strongest resonance is observed at 82.9 kHz with a focal spot size of 3.12 mm. The subwavelength spatial resolution of the lens structures at the resonances is attributed to the near field scattering of the acoustic waves.
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43.58.Ls Acoustical lenses and microscopes
43.35.Ae Ultrasonic velocity, dispersion, scattering, diffraction, and attenuation in gases

Controlled volume transfer and lens shape formation by liquid bridge disconnection

Yun-Ho Jang, Kyounggun Lee, and Yong-Kweon Kim

Appl. Phys. Lett. 100, 214103 (2012); http://dx.doi.org/10.1063/1.4720154 (3 pages)

Online Publication Date: 23 May 2012

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A liquid bridge was created and disconnected to transfer a controlled volume of mixture to a cylindrical post for the formation of parabolic lens shapes. We investigated a transferred volume and the focal length of the lens shape in terms of four parameters: post radius, withdrawal speed, dipping depth, and mixture thickness. The presented method is simple and flexible to transfer a pre-analyzed volume and subsequently to fabricate a lens shape on post structures, which can be beneficial to implementing self-aligned and smooth lenses integrated in micro structures.
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42.79.Bh Lenses, prisms and mirrors
42.86.+b Optical workshop techniques
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Mirrors for slow neutrons from holographic nanoparticle-polymer free-standing film-gratings

J. Klepp, C. Pruner, Y. Tomita, K. Mitsube, P. Geltenbort, and M. Fally

Appl. Phys. Lett. 100, 214104 (2012); http://dx.doi.org/10.1063/1.4720511 (3 pages) | Cited 1 time

Online Publication Date: 23 May 2012

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We report on tests of holographically arranged grating-structures in nanoparticle-polymer composites in the form of 100 μm thin free-standing films, i.e., without sample containers or covers that could cause unwanted absorption/incoherent scattering of very-cold neutrons. Despite their large diameter of 2 cm, the flexible materials are of high optical quality and yield mirror-like reflectivity of about 90% for neutrons of 4.1 nm wavelength.
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42.79.Bh Lenses, prisms and mirrors
42.40.Eq Holographic optical elements; holographic gratings
42.70.-a Optical materials

Uniform magnetic field distribution of a spatially structured resonant coil for wireless power transfer

Wang-Sang Lee, Han Lim Lee, Kyoung-Sub Oh, and Jong-Won Yu

Appl. Phys. Lett. 100, 214105 (2012); http://dx.doi.org/10.1063/1.4719585 (5 pages) | Cited 2 times

Online Publication Date: 23 May 2012

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A spatially structured resonant coil with uniform magnetic field distribution for wireless power transfer is presented. The characteristics of the proposed resonant coil are verified by the theoretical analysis, simulation results, and experimental measurements. Due to the uniform magnetic field distribution, the overall transfer efficiency between the transmitting and receiving resonant coils can be improved up to 44% compared to the conventional coil regardless of the location of the receiving coil at the transfer distance.
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84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables
84.32.Hh Inductors and coils; wiring

Aggregation kinetics of detonation nanocarbon

Sorin Bastea

Appl. Phys. Lett. 100, 214106 (2012); http://dx.doi.org/10.1063/1.4722783 (3 pages)

Online Publication Date: 24 May 2012

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We analyze the properties of diffusion-limited coagulation and associated energy release applicable to processes such as nanocarbon production in detonation or nanoaerosols growth. We introduce a physical model that yields the expected energy release by treating the aggregation kinetics as a quasi phase transformation with a nonlinear rate dependent on the size of the initial nuclei, thermodynamic conditions, and viscosity of the fluid matrix.
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82.70.Rr Aerosols and foams
65.20.Jk Studies of thermodynamic properties of specific liquids
66.20.Ej Studies of viscosity and rheological properties of specific liquids
81.16.-c Methods of micro- and nanofabrication and processing
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