APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

28 Sep 2009

Volume 95, Issue 13, Articles (13xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 131107 (2009); http://dx.doi.org/10.1063/1.3236752 (3 pages)

Marcus Eichfelder, Wolfgang-Michael Schulz, Matthias Reischle, Michael Wiesner, Robert Roßbach, Michael Jetter, and Peter Michler
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Double aperture focusing transducer for controlling microparticle motions in trapezoidal microchannels with surface acoustic waves

Ming K. Tan, Ricky Tjeung, Hannah Ervin, Leslie Y. Yeo, and James Friend

Appl. Phys. Lett. 95, 134101 (2009); http://dx.doi.org/10.1063/1.3238313 (3 pages) | Cited 4 times

Online Publication Date: 28 September 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present a method for controlling the motion of microparticles suspended in an aqueous solution, which fills in a microchannel fabricated into a piezoelectric substrate, using propagating surface acoustic waves. The cross-sectional shape of this microchannel is trapezoidal, preventing the formation of acoustic standing waves across the channel width and therefore allowing the steering of microparticles. The induced acoustic streaming transports these particles to eliminate the use of external pumps for fluid actuation.
Show PACS
43.25.-x Nonlinear acoustics
43.38.Rh Surface acoustic wave transducers
47.61.-k Micro- and nano- scale flow phenomena

Near edge x-ray absorption fine structure spectroscopy with x-ray free-electron lasers

D. P. Bernstein, Y. Acremann, A. Scherz, M. Burkhardt, J. Stöhr, M. Beye, W. F. Schlotter, T. Beeck, F. Sorgenfrei, A. Pietzsch, W. Wurth, and A. Föhlisch

Appl. Phys. Lett. 95, 134102 (2009); http://dx.doi.org/10.1063/1.3236540 (3 pages) | Cited 7 times

Online Publication Date: 28 September 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate the feasibility of near edge x-ray absorption fine structure spectroscopy on solids by means of femtosecond soft x-ray pulses from a free-electron laser (FEL). Our experiments, carried out at the FEL at Hamburg used a special sample geometry, spectrographic energy dispersion, single shot position-sensitive detection, and a data normalization procedure that eliminates the severe fluctuations of the incident intensity in space and photon energy. As an example, we recorded the 3D1 N4,5 edge absorption resonance of La3+ ions in LaMnO3. Our study opens the door for x-ray absorption measurements on future x-ray FEL facilities.
Show PACS
78.70.Dm X-ray absorption spectra
42.55.Vc X- and γ-ray lasers
41.60.Cr Free-electron lasers
78.47.-p Spectroscopy of solid state dynamics

Wideband vibration energy harvester with high permeability magnetic material

X. Xing, J. Lou, G. M. Yang, O. Obi, C. Driscoll, and N. X. Sun

Appl. Phys. Lett. 95, 134103 (2009); http://dx.doi.org/10.1063/1.3238319 (3 pages) | Cited 11 times

Online Publication Date: 29 September 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A vibration energy harvester based on a high permeability cantilever beam was demonstrated, which overcomes the limitation of the existing approaches in output power and working bandwidth. Magnetostatic coupling between the vibrating highly permeable beam and bias magnetic field leads to maximized flux change and large induced voltage. The coexistence of magnetostatic and elastic potential energy results in the nonlinear oscillation with wide bandwidth. The harvester showed a maximum power of 74 mW and power density of 1.07 mW/cm3 at 54 Hz under acceleration of 0.57 g (with g = 9.8 m/s2), and bandwidth of 10 Hz (or 18.5% of the operating frequency).
Show PACS
84.60.-h Direct energy conversion and storage

Percolation of two-dimensional multiwall carbon nanotube networks

Heon Sang Lee, Chang Hun Yun, Sun Kug Kim, Ji Hoon Choi, Cheol Jin Lee, Hyoung-Joon Jin, Hyunjung Lee, Sang Joon Park, and Min Park

Appl. Phys. Lett. 95, 134104 (2009); http://dx.doi.org/10.1063/1.3238326 (3 pages) | Cited 6 times

Online Publication Date: 1 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We highlight the significance of multiwall carbon nanotube (MWCNT) shape on the electrical percolation. For rodlike MWCNTs, percolation threshold depends on aspect ratio (L/d). For random coil-like MWCNTs, the percolation threshold does not depend on L/d but depends on the shape factor of MWCNTs represented by the ratio between static bending persistence length and diameter. Surface resistivities of various MWCNTs converge into single curve when we plot their dimensionless surface concentration versus surface resistivity. The surface resistivity of MWCNT films decrease with increasing temperature, particularly at low concentrations, indicating the films can be used as a negative temperature coefficient thermistor.
Show PACS
73.63.Fg Nanotubes
73.25.+i Surface conductivity and carrier phenomena
84.32.Ff Conductors, resistors (including thermistors, varistors, and photoresistors)
61.48.De Structure of carbon nanotubes, boron nanotubes, and other related systems

Dripping to jetting transitions observed from supercritical fluid in liquid microcoflows

S. Marre, C. Aymonier, P. Subra, and E. Mignard

Appl. Phys. Lett. 95, 134105 (2009); http://dx.doi.org/10.1063/1.3242375 (3 pages) | Cited 5 times

Online Publication Date: 2 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Dripping to jetting transition from liquid-liquid to liquid-gas systems has been widely studied in microfluidics. Recent developments have permitted the use of supercritical fluids at high pressure and various temperatures in microfluidic systems to develop sustainable processes. In this article, we use this strategy to demonstrate the possibility to generate stable droplets and reversible dripping to jetting transitions at microscale from supercritical carbon dioxide-liquid water microcoflows.
Show PACS
47.61.Jd Multiphase flows
47.55.D- Drops and bubbles
47.85.Np Fluidics
47.60.Kz Flows and jets through nozzles
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close