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7 Sep 2009

Volume 95, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 083506 (2009); http://dx.doi.org/10.1063/1.3216851 (3 pages)

J. Z. Sun, M. C. Gaidis, E. J. O’Sullivan, E. A. Joseph, G. Hu, D. W. Abraham, J. J. Nowak, P. L. Trouilloud, Yu Lu, S. L. Brown, D. C. Worledge, and W. J. Gallagher

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Locally resonant phononic woodpile: A wide band anomalous underwater acoustic absorbing material

Heng Jiang, Yuren Wang, Milin Zhang, Yanping Hu, Ding Lan, Yinmin Zhang, and Bingchen Wei

Appl. Phys. Lett. 95, 104101 (2009); http://dx.doi.org/10.1063/1.3216805 (3 pages) | Cited 5 times

Online Publication Date: 9 September 2009

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To meet the demand of modern acoustic absorbing material for which acoustic absorbing frequency region can be readily tailored, we introduced woodpile structure into locally resonant phononic crystal (LRPC) and fabricated an underwater acoustic absorbing material, which is called locally resonant phononic woodpile (LRPW). Experimental results show that LRPW has a strong capability of absorbing sound in a wide frequency range. Further theoretical research revealed that LRPC units and woodpile structure in LRPW play an important role in realization of wide band underwater strong acoustic absorption.
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43.30.Ky Structures and materials for absorbing sound in water; propagation in fluid-filled permeable material
62.65.+k Acoustical properties of solids
63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials

Paper transistor made with covalently bonded multiwalled carbon nanotube and cellulose

Sungryul Yun, Sang-Dong Jang, Gyu-Young Yun, Joo-Hyung Kim, and Jaehwan Kim

Appl. Phys. Lett. 95, 104102 (2009); http://dx.doi.org/10.1063/1.3224200 (3 pages) | Cited 13 times

Online Publication Date: 10 September 2009

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We report a flexible paper transistor made with regenerated cellulose and covalently bonded multiwalled carbon nanotube (RC-MWCNT). MWCNT bonded to cellulose chains can act as electron channel paths in dielectric cellulose layers. It is found that the covalent bonding between cellulose and MWCNT can be modulated by reaction time and temperature. The RC-MWCNT paper transistor shows that the leakage current and the on/off ratio are strongly associated with the concentration of MWCNTs. The estimated electron mobility of RC-MWCNT paper is comparable to other organic transistor materials. The RC-MWCNT paper transistor has a potential for flexible electronic paper.
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85.30.Tv Field effect devices
85.35.Kt Nanotube devices

Large magnetic-field-induced strains in Ni–Mn–Ga nonmodulated martensite

V. A. Chernenko, M. Chmielus, and P. Müllner

Appl. Phys. Lett. 95, 104103 (2009); http://dx.doi.org/10.1063/1.3227661 (3 pages) | Cited 12 times

Online Publication Date: 11 September 2009

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See Also: Publisher's Note

Show Abstract
Large magnetic field-induced strains of up to 0.17% for a stress-free Ni53.1Mn26.6Ga20.3 single crystal with nonmodulated martensite phase were generated in a rotating magnetic field. This magnetic-field-induced strain, which is ten times larger than values reported so far for nonmodulated martensites, evidences significant magnetic-field-induced twin boundary motion, which so far was thought to be impossible. This result reinforces the interest in nonmodulated martensites, which are formed as a ground state in the Heusler-type ferromagnetic shape memory alloys.
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75.80.+q Magnetomechanical effects, magnetostriction
81.40.Lm Deformation, plasticity, and creep
62.20.fg Shape-memory effect; yield stress; superelasticity
61.72.Mm Grain and twin boundaries
75.50.Cc Other ferromagnetic metals and alloys
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