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21 May 2007

Volume 90, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 90, 213501 (2007); http://dx.doi.org/10.1063/1.2742294 (3 pages)

Jong-Hyun Ahn, Hoon-Sik Kim, Etienne Menard, Keon Jae Lee, Zhengtao Zhu, Dae-Hyeong Kim, Ralph G. Nuzzo, John A. Rogers, Islamshah Amlani, Vadim Kushner, Shawn G. Thomas, and Terrisa Duenas
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Foamability and structure analysis of foams in Hele-Shaw cell

H. Caps, N. Vandewalle, G. Broze, and G. Zocchi

Appl. Phys. Lett. 90, 214101 (2007); http://dx.doi.org/10.1063/1.2740592 (3 pages) | Cited 3 times

Online Publication Date: 21 May 2007

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The authors have generated two-dimensional foams by imposing an intermittent drainage in a Hele-Shaw cell partially filled with a detergent/water mixture. The foam generation associated with this process is reproducible and depends on the surfactant molecules composing the solution. A kinetic model can be proposed for the foam evolution. The structure of the foam is also investigated: the average bubble side number and correlation functions are measured. Distinguishable behaviors are observed for different surfactant molecules. This way of producing a foam is thus adequate for applied foam structure characterizations and fundamental studies.
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82.70.Rr Aerosols and foams
61.25.-f Studies of specific liquid structures

In situ investigation of the discharge of alkaline Zn–MnO2 batteries with synchrotron x-ray and neutron tomographies

I. Manke, J. Banhart, A. Haibel, A. Rack, S. Zabler, N. Kardjilov, A. Hilger, A. Melzer, and H. Riesemeier

Appl. Phys. Lett. 90, 214102 (2007); http://dx.doi.org/10.1063/1.2742283 (3 pages) | Cited 12 times

Online Publication Date: 21 May 2007

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Zn–MnO2 alkaline batteries were investigated in situ at different stages of electric discharge by synchrotron tomography with monochromatic x rays and by neutron tomography. The spatial distribution and the changes in the morphology of different components of a battery caused by the reduction of MnO2, the dissolution of Zn, and the nucleation and growth of ZnO are investigated with high spatial resolution around several micrometers with x rays. Neutron tomography is used to monitor the changes in the spatial distribution of hydrogen in the MnO2 matrix and provides complementary information about the process.
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82.47.Cb Lead-acid, nickel-metal hydride and other batteries

Powerful polymeric thermal microactuator with embedded silicon microstructure

G. K. Lau, J. F. L. Goosen, F. van Keulen, T. Chu Duc, and P. M. Sarro

Appl. Phys. Lett. 90, 214103 (2007); http://dx.doi.org/10.1063/1.2742599 (3 pages) | Cited 11 times

Online Publication Date: 23 May 2007

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A powerful and effective design of a polymeric thermal microactuator is presented. The design has SU-8 epoxy layers filled and bonded in a meandering silicon (Si) microstructure. The silicon microstructure reinforces the SU-8 layers by lateral restraint. It also improves the transverse thermal expansion coefficient and heat transfer for the bonded SU-8 layers. A theoretical model shows that the proposed SU-8/Si composite can deliver an actuation stress of 1.30 MPa/K, which is approximately 2.7 times higher than the unconstrained SU-8 layer, while delivering an approximately equal thermal strain.
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07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Microscale memory characteristics of virus-quantum dot hybrids

Nathaniel G. Portney, Ricky J. Tseng, Giuseppe Destito, Erica Strable, Yang Yang, Marianne Manchester, M. G. Finn, and Mihrimah Ozkan

Appl. Phys. Lett. 90, 214104 (2007); http://dx.doi.org/10.1063/1.2742787 (3 pages) | Cited 13 times

Online Publication Date: 23 May 2007

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An electrical multi stability effect was observed for a single layer device fabricated, comprising a hybrid virus-semiconducting quantum dot (CdSe/ZnS core/shell Qds) assembled onto icosahedral-mutant-virus template (CPMV-T184C). A substrate based bottom-up pathway was used to conjugate two different color emitting Qds for fluorescence visualization and to insert a charging/decharging factor. Pulsed wave measurements depicted distinct conductive states with repeatable and nonvolatile behavior as a functioning memory element.
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85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
85.65.+h Molecular electronic devices

Acoustic dispersion in a ball-shaped surface acoustic wave device

Kazushi Yamanaka, Kanwar Jit Singh, Naoya Iwata, Takuji Abe, Shingo Akao, Yusuke Tsukahara, and Noritaka Nakaso

Appl. Phys. Lett. 90, 214105 (2007); http://dx.doi.org/10.1063/1.2741606 (3 pages) | Cited 6 times

Online Publication Date: 24 May 2007

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Theoretical model for ball surface acoustic wave (SAW) sensors has been developed. Wave front distortion encountered in planar SAW sensors caused by diffraction or reflection can be neglected because of the diffraction-free propagation of a naturally collimated beam. Wave form at each turn is expressed by an integral of terms defined by the array factor and the elementary charge density of electrodes as well as the frequency-dependent velocity and attenuation caused by the sensitive film. Irrespective of the significant simplicity of the theory, excellent agreement has been observed between the simulated and experimental wave forms of a double-electrode ball SAW sensor.
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43.58.-e Acoustical measurements and instrumentation
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