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29 Mar 2004

Volume 84, Issue 13, pp. 2223-2459

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Appl. Phys. Lett. 84, 2244 (2004); http://dx.doi.org/10.1063/1.1690471 (3 pages)

David R. Smith, David Schurig, Jack J. Mock, Pavel Kolinko, and Patrick Rye
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Transparent matrix structures for detection of neutron particles based on di-ureasil xerogels

Hee-Jung Im, Carl Willis, Andrew C. Stephan, Michelle D. Pawel, Suree Saengkerdsub, and Sheng Dai

Appl. Phys. Lett. 84, 2448 (2004); http://dx.doi.org/10.1063/1.1690464 (3 pages) | Cited 5 times

Online Publication Date: 23 March 2004

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An important element in the development of advanced neutron detectors is the synthesis and characterization of improved, highly efficient neutron-scintillating materials. The research described here concerns the development of elastic, transparent, and thick film neutron scintillators with high 6Li+ loading through room-temperature sol-gel processing. The room-temperature sol-gel processing allows an easy integration of such scintillating materials into electronic detecting devices. The lithium-6 salicylate di-ureasil xerogels developed here show promise for the fabrication of large area neutron detectors and have high potential for use in in situ monitoring and imaging of fissile materials and radioactive contaminants. © 2004 American Institute of Physics.
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81.07.Pr Organic-inorganic hybrid nanostructures
82.70.Gg Gels and sols
81.10.Dn Growth from solutions
81.10.Fq Growth from melts; zone melting and refining
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
29.40.Mc Scintillation detectors

Effect of adhesion on dynamic and static friction in surface micromachining

A. D. Corwin and M. P. de Boer

Appl. Phys. Lett. 84, 2451 (2004); http://dx.doi.org/10.1063/1.1691198 (3 pages) | Cited 22 times

Online Publication Date: 23 March 2004

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We measure friction of monolayer-lubricated microelectromechanical systems surfaces under both static and dynamic conditions while continuously controlling the applied normal load at positive or negative values (i.e., compression or tension). The dynamic friction experiment methodology we have devised enables fitting to the complete one-dimensional equation of motion. We observe friction at zero applied load, and quantitatively attribute this to interfacial adhesion. Within error, the adhesive force is the same under static and dynamic conditions. © 2004 American Institute of Physics.
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68.35.Np Adhesion
81.40.Pq Friction, lubrication, and wear
62.20.Qp Friction, tribology, and hardness
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

Two-photon fluorescence-guided laser tweezers for study of cluster growth and gelation process

A. N. Kuzmin, A. V. Kachynski, T. Y. Ohulchanskyy, I. Roy, P. N. Prasad, and S. Bruckenstein

Appl. Phys. Lett. 84, 2454 (2004); http://dx.doi.org/10.1063/1.1690462 (3 pages) | Cited 3 times

Online Publication Date: 23 March 2004

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Laser tweezers trapping technology has been used to monitor the bulk solution viscosity during the sol-gel gelation process at different depths from an interface. The gelation rate is the same in depth ranges 2–20 μm from the bounding surface. Simultaneously with the laser tweezers study, a microviscosity kinetic measurement of the sol-gel process was performed by fluorescent anisotropy and quantum yield methods. The large differences found between the bulk and microviscosities obtained in the experiment reflect the intrinsic differences in solution environment sensed by the laser tweezers on the macro level and by other optical techniques on the microlevels. © 2004 American Institute of Physics.
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37.10.Vz Mechanical effects of light on atoms, molecules, and ions
83.60.Fg Shear rate dependent viscosity
78.55.Kz Solid organic materials

Detection of nondelayed photons in the forward-scattering of picosecond pulses

A. Andreoni, M. Bondani, A. Brega, F. Paleari, A. S. Spinelli, and G. Zambra

Appl. Phys. Lett. 84, 2457 (2004); http://dx.doi.org/10.1063/1.1691495 (3 pages) | Cited 4 times

Online Publication Date: 23 March 2004

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We perform time-correlated single-photon counting measurements on 9 ps pulses from a cw mode-locked Nd laser passed through highly turbid water suspensions of Intralipid™, which is a phantom medium widely used for light propagation studies. By detecting photons emerging at very small angles with a system whose pulse-response duration is ∼ 34 ps full width at half-maximum, we obtain time-of-flight distributions in which the contributions of photons nondelayed by scattering events are evident up to very high values of Intralipid concentrations. © 2004 American Institute of Physics.
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07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment
07.60.Dq Photometers, radiometers, and colorimeters
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