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1 Jan 2007

Volume 90, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 90, 012105 (2007); http://dx.doi.org/10.1063/1.2428402 (3 pages)

Jan Bauer, Frank Fleischer, Otwin Breitenstein, Luise Schubert, Peter Werner, Ulrich Gösele, and Margit Zacharias
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Self-assembly of carbon black into nanowires that form a conductive three dimensional micronetwork

L. E. Levine, G. G. Long, J. Ilavsky, R. A. Gerhardt, R. Ou, and C. A. Parker

Appl. Phys. Lett. 90, 014101 (2007); http://dx.doi.org/10.1063/1.2425011 (3 pages) | Cited 6 times

Online Publication Date: 2 January 2007

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The authors have used mechanical self-assembly of carbon-black nanoparticles to fabricate a three dimensional, electrically connected micronetwork of nanowires embedded within an insulating, supporting matrix of poly(methyl methacrylate). The electrical connectivity, mean wire diameter, and morphological transitions were characterized as a function of the carbon-black mass fraction. Conductive wires were produced with mean diameters as low as 24 nm with lengths up to 100 μm.
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81.16.Dn Self-assembly
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
61.46.-w Structure of nanoscale materials
72.80.Tm Composite materials

Sound beyond the speed of light: Measurement of negative group velocity in an acoustic loop filter

W. M. Robertson, J. Pappafotis, P. Flannigan, J. Cathey, B. Cathey, and C. Klaus

Appl. Phys. Lett. 90, 014102 (2007); http://dx.doi.org/10.1063/1.2423240 (3 pages) | Cited 17 times

Online Publication Date: 2 January 2007

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The authors describe the experimental observation of negative group velocity propagation of sound waves through an asymmetric loop filter. The characteristics of the filter are established using impulse response and direct tunneling of narrow bandwidth Gaussian pulses. The results confirm recent theoretical predictions that faster-than-light group velocity propagation of sound is possible. Further, the results show that the spectral rephasing achieved in a loop filter is sufficient to produce negative group velocities independent of the phase velocity of the spectral components themselves. Thus, superluminal propagation is realized despite almost six orders of magnitude difference between the speeds of sound and light.
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43.20.Ye Measurement methods and instrumentation
43.58.Kr Spectrum and frequency analyzers and filters; acoustical and electrical oscillographs; photoacoustic spectrometers; acoustical delay lines and resonators

Acceleration sensitivity in beam-type electrostatic microresonators

Manu Agarwal, Kwan K. Park, Saurabh A. Chandorkar, Rob N. Candler, Bongsang Kim, Matthew A. Hopcroft, Renata Melamud, Thomas W. Kenny, and Boris Murmann

Appl. Phys. Lett. 90, 014103 (2007); http://dx.doi.org/10.1063/1.2426884 (3 pages) | Cited 2 times

Online Publication Date: 2 January 2007

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This letter examines the dependence of the natural frequency in a microelectromechanical resonator on externally applied acceleration. The particular structure studied is an electrostatically coupled, single anchored, double-ended silicon tuning fork. The authors find that the acceleration dependence in this resonator is primarily due to axial stress on the resonator beams. Measurements show an acceleration sensitivity Δf/f0 of 7×10−9/g, which is comparable to values found for typical quartz crystal resonators. This result was obtained using dynamic (vibration) measurements, and validated using theoretical analysis and finite element simulations.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.10.Cm Micromechanical devices and systems
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