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19 May 2008

Volume 92, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 92, 202101 (2008); http://dx.doi.org/10.1063/1.2927379 (3 pages)

Jasmin Aghassi, Matthias H. Hettler, and Gerd Schön
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Significantly reducing electrical resistivity by forming conductive Ni chains in a polyurethane shape-memory polymer/carbon-black composite

J. S. Leng, W. M. Huang, X. Lan, Y. J. Liu, and S. Y. Du

Appl. Phys. Lett. 92, 204101 (2008); http://dx.doi.org/10.1063/1.2931049 (3 pages) | Cited 34 times

Online Publication Date: 21 May 2008

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We demonstrate an approach to significantly reduce the electrical resistivity in a polyurethane shape-memory polymer (SMP) filled with randomly distributed carbon black (CB). With an additional small amount of randomly distributed Ni microparticles (0.5 vol %) in the SMP/CB composite, its electrical resistivity is only reduced slightly. However, if these Ni particles are aligned into chains (by applying a low magnetic field on the SMP/CB/Ni solution before curing), the drop of the electrical resistivity is significant. This approach, although demonstrated in a SMP, is applicable to other conductive polymers.
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72.20.-i Conductivity phenomena in semiconductors and insulators
72.80.Tm Composite materials
62.20.fg Shape-memory effect; yield stress; superelasticity
81.40.Lm Deformation, plasticity, and creep

Paramagnetic Eu2+ center as a probe for the sensitivity of CsBr x-ray needle image plates

F. Loncke, H. Vrielinck, P. Matthys, F. Callens, J.-P. Tahon, and P. Leblans

Appl. Phys. Lett. 92, 204102 (2008); http://dx.doi.org/10.1063/1.2936860 (3 pages) | Cited 2 times

Online Publication Date: 23 May 2008

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Needlelike CsBr:Eu x-ray storage phosphor plates exhibit an excellent sensitivity as expressed by their photostimulated luminescence (PSL) intensity and have ever growing applications in medical radiography. An earlier electron paramagnetic resonance (EPR) study revealed spectra due to a Eu2+ center with axial ⟨100⟩ symmetry. In this work, its EPR intensity is shown to exhibit a linear correlation with the PSL intensity and the sensitivity of the plates. It can thus be expected that the structural information retrieved from EPR and related techniques may substantially contribute to the understanding of the physics behind the writing and reading processes in the phosphor.
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76.30.Da Ions and impurities: general
78.55.Hx Other solid inorganic materials
61.72.U- Doping and impurity implantation

Enhanced directed emission from metamaterial based radiation source

Elena Saenz, Kaan Guven, Ekmel Ozbay, Iñigo Ederra, and Ramon Gonzalo

Appl. Phys. Lett. 92, 204103 (2008); http://dx.doi.org/10.1063/1.2931027 (3 pages) | Cited 1 time

Online Publication Date: 23 May 2008

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The enhanced directed emission from a metasurface which is illuminated at its resonance frequency by a dipole source is experimentally demonstrated. The metasurface consists of two cutwire layers and a continuous wire layer in between, which exhibits strong magnetic dipole resonance under excitation normal to the plane. The scanned near-field patterns show the confinement of the field in the presence of metasurface, which, in turn, provides an enhanced and directional radiation in the far field. The far-field patterns are obtained by direct measurement and by a far-field transformation of the scanned near field, which are found to be in good agreement.
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42.72.-g Optical sources and standards
42.70.-a Optical materials
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