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Temperature Dependent Fluorescence of Nanocrystalline Ce-doped Garnets For Use as Thermographic Phosphors

MRS Online Proceedings Library 2008年第1期1076卷 1-6页

作者： Hansel, Rachael Allison, Steve Walker, Greg Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville USA Oak Ridge National Laboratory Oak Ridge USA Department of Mechanical Engineering Vanderbilt University Nashville USA

Four samples of (Y1−xCex)3(Al1−y Gay)5O12 (where x=0.01, 0.02 and y=0, 0.5) were synthesized via the simple, efficient combustion synthesis method in order to determine the effect of substituting Ga3+ for Al3+ on the temperature-dependent fluorescent lifetime. X-ray diffraction shows that the Ga-doped samples have longer lattice constants and transmission electron microscopy data show that each sample consists of nanocrystallites which have agglomerated in micron-sized particles. Photoluminescence data reveal that the addition of gallium into the YAG:Ce matrix induces a red shift in the absorption spectra and a blue-shift in the emission spectra. The laser-induced fluorescent lifetime was determined as a function of temperature over the range of 0-125°C using two different emission filters. Increasing the amount of dopant ultimately results in a decrease of the fluorescent lifetime. The quenching temperatures for the Ga-doped samples were lower than the samples without gallium. The results of this work show that combustion synthesis is viable method for making highly luminescent, nanocrystalline TGPs. In addition, these results show that the quenching temperature of YAG:Ce can be altered by substituting ions which alter the location of the charge transfer state and by changing the morphology of the sample.

关键词： crystalline sensor dopant

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Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

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21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, LEOS 2008

作者： Rong, G. Wei, X. Kang, C. Liscidini, M. Sipe, J.E. Mernaugh, R.L. Weiss, S.M. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics Institute for Optical Sciences University of Toronto Toronto ON M5S 1A7 Canada Department of Biochemistry Vanderbilt University Nashville TN 37235 United States

Nanoscale porous silicon waveguides, both on silicon substrates and free-standing membranes, are explored for biosensing applications. Measured detection limits in the nanomolar range are reported for DNA sensing. ... 详细信息

ISBN: (纸本)9781424419326

关键词： Porous silicon

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Linear and nonlinear plasmonic effects modulated by a metalinsulator transition

Linear and nonlinear plasmonic effects modulated by a metali...

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IEEE/LEOS Winter Topical Meeting Series

作者： R. F. Haglund E. U. Donev L. C. Feldman D. W. Ferrara R. Lopez J. Y. Suh K.A. Tetz Department of Physics and Astronomy Interdisciplinary Graduate Program in Materials Science and Vanderbilt Institute for Nanoscale Science and Engineering Vanderbilt University Nashville TN USA Department of Physics and Astronomy and Department of Materials Science and Engineering Rutgers University Piscataway NJ USA Department of Physics and Astronomy and Institute for Advanced Materials Nanoscience and Technology North Carolina State University Chapel Hill NC USA

Localized and propagating plasmonic effects in noble-metal nanostructures are receiving worldwide attention as potential enabling principles for optical and electro-optic devices. A critical need in plasmonic device design is a general technique for active modulation of the plasmon response. In this paper, we describe the use of a reversible, solid-solid phase transition in VO 2 to modulate plasmonic response. Case studies are drawn from experiments on nano structured hole and particle arrays in which VO 2 acts as a modulator by altering the local dielectric constant.

关键词： Plasmons Optical devices Optical propagation Nanostructures Nonlinear optical devices Nonlinear optics Optical modulation Electrooptic devices Phase modulation Dielectric constant

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Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

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IEEE Photonics Conference (IPC)

作者： G. Rong X. Wei C. Kang M. Liscidini J. E. Sipe R. L. Mernaugh S. M. Weiss Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Department of Physics and Institute for Optical Sciences University of Toronto Toronto ONT Canada Department of Biochemistry Vanderbilt University Nashville TN USA

关键词： Silicon Biosensors Optical waveguides Gratings Biomembranes Resonance DNA Biological materials Optical materials Optical surface waves

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NONCOVALENT SURFACE MODIFICATION OF MULTIWALLED CARBON NANOTUBES WITH CHITOSAN:EFFECT OF DEGREE OF DEACETYLATION

NONCOVALENT SURFACE MODIFICATION OF MULTIWALLED CARBON NANOT...

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第十四届世界食品科技大会

作者： Chularat Iamsamai Stephan T.Dubas Uracha Ruktanonchai Apinan Soottitantawat Supot Hannongbua Nanoscience and Technology Program Graduate SchoolChulalongkom University Bangkok 10330 THAILAND Metallurgy and Materials Science Research Institute Chulalongkom University Bangkok 10330 THAILAND National Nanotechnology Center National Science and Technology Development Agency Pathumthani 1212 Department of Chemical Engineering Faculty of Engineering Chulalongkom UniversityBangkok 10330 TH Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 THAILAND

In this research,Chitosan has been used for the noncovalent modification of multiwalled carbon nanotubes (MWNTs) and improve their dispersion in *** order to be able to integrate MWNTs with biological systems,it is critical that the solubility of the MWNTs be improved due to their poor solubility in most *** varying the reaction of time of chitin in concentrated NaOH,Chitosan samples with different % degree of deacetylation (%DD) (58%,76%,81%,91%,and 94%) were prepared.

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Strategy for ubiquitous titanium alloys

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Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 2008年第12期72卷 915-915页

作者： Niinomi, Mitsuo Hanawa, Takao Ikeda, Masahiko Chiba, Akihiko Furuhara, Tadashi Narushima, Takayuki Tsuchiya, Koichi Emura, Satoshi Nakano, Takayoshi Takenaka, Toshihide Institute for Materials Research Tohoku University Katahira 2-1-1 Sendai 980-8577 Institute for Biomaterials and Bioengineering 2-3-10 Surugadai Kanda Chiyoda-ku Tokyo 101-0062 Faculty of Chemistry Materials and Bioengineering Kansai University 3-3-35 Yamate Suita 564-8680 Osaka Graduate School of Engineering Tohoku Unversity 6-6 Aoba Aramaki Aoba-ku Sendai 980-8579 National Institute for Materials Science 1-2-1 Sengen Tsukuba 305-0047 Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita 565-0871 Deaprtment of Production Systems Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi 441-8580

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Crystal Growth and Plastic Deformation Behavior of Ti-29Nb-13Ta-4.6Zr Bcc-Based Single Crystal 11

Crystal Growth and Plastic Deformation Behavior of Ti-29Nb-1...

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11th World Conference on Titanium, Ti-2007

作者： Nakano, Takayoshi Hagihara, Koji Maki, Hideaki Umakoshi, Yukichi Niinomi, Mitsuo Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Suita565-0871 Japan Department of Biomaterials Science Institute for Materials Research Tohoku University Sendai980-8577 Japan

ISBN: (纸本)9784889034066

A Ti-29Nb-13Ta-4.6Zr (mass.%) alloy with a bcc structure has been of great interest as a biomaterial for bone replacement due to its low cyto-toxicity and low Young's modulus. A single crystal of this alloy has been successfully obtained by using an optical floating zone method, in spite of its being a quaternary alloy. Thus, compression and fatigue behaviors of the Ti-Nb-Ta-Zr single crystal were investigated by focusing on the precipitation of the α and ω phases. The constituent phases of the single crystal strongly depend on the heat treatment: single-phase β (bcc structure) just after the solution treatment at 1063 K, two-phase (β+ω) annealed at 573 K and 593 K, three-phase (β+ω+α) annealed at 673 K, and two-phase (β+α) annealed at 723 K. Yield stress, fracture strain, deformation mode of slip or {332} twinning, cyclic hardening and softening, and fatigue life at room temperature strongly depend on the constituent phases. In compression, moreover, slip plane and deformation mode change depending on the loading axis (χ), similar to the effects in other bcc alloys. In this article, we describe the single-crystal growth, the constituent phases, and the plastic deformation behavior in compression as well as the cyclic deformation behavior. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All Rights Reserved.

关键词： Niobium alloys

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Effect of Bcc-phase Stability on Cyclic Deformation Behavior in Beta-type Ti-Nb-Ta-Zr Alloys Single Crystals with Different Nb Content 11

Effect of Bcc-phase Stability on Cyclic Deformation Behavior...

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11th World Conference on Titanium, Ti-2007

作者： Hagihara, Koji Nakano, Takayoshi Sonoura, Akihiro Watanabe, Katsuya Umakoshi, Yukichi Niinomi, Mitsuo Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Suita565-0871 Japan Department of Biomaterials Science Institute for Materials Research Tohoku University Sendai980-8577 Japan

ISBN: (纸本)9784889034066

β-type Ti-Nb-Ta-Zr alloys have been receiving much attention for biomedical applications due to their superior properties such as low cyto-toxicity and low modulus. The deformation behavior of these alloys is known to strongly depend on the stability of the bcc phase, which governs the selection of operative deformation modes. In this study, we focus on three alloys of Ti-25Nb-10Ta-5Zr, Ti-29Nb-13Ta-4.6Zr and Ti-35Nb-10Ta-5Zr (mass.%), with different Nb content, which is closely related to the bcc-phase stability. The deformation behavior, especially the tension-compression cyclic deformation behavior, is investigated using single crystals grown by the optical floating zone method. The dominant operative deformation modes are determined as α" stress-induced martensite (SIM), {332} twinning, and {101} slip in Ti-25Nb-10Ta-5Zr, Ti-29Nb-13Ta-4.6Zr and Ti-35Nb-10Ta-5Zr, respectively. The differences in operative deformation modes lead to significant variation in cyclic deformation behaviors such as yield stress, shape of hysteresis loops and cyclic hardening curves. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All Rights Reserved.

关键词： Titanium alloys

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Catalytic surface modification of roll-milled poly(Ε-caprolactone) biaxially stretched to ultra-thin dimension

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materials science and engineering C 2007年第2期27卷 299-303页

作者： Foo, H.L. Taniguchi, A. Yu, H. Okano, T. Teoh, S.H. Graduate Programme in Bioengineering National University of Singapore Singapore Bionic Materials Technology Group Biomaterials Center National Institute for Materials Science Japan Department of Physiology National University of Singapore Singapore Institute of Biomedical Engineering Tokyo Women's Medical University Japan Department of Mechanical Engineering National University of Singapore Singapore

A novel roll-milling polymer processing technique along with biaxial stretching was used to fabricate 10 μm thick poly(Ε-caprolactone) films. A less invasive collagen surface modification was used, involving a reaction between corona-preactivated membranes and ferrous-containing acrylic acid solution at the low temperature of 42 °C. Successful modified films were characterized by Toluidine Blue O assay and X-ray photoelectron spectroscopy. Human umbilical vein endothelial cells also showed both higher proliferation rate and differentiated cobblestone morphology on these collagen-immobilized substrates. © 2006 Elsevier B.V. All rights reserved.

关键词： Collagen

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Bioactive coatings by vaterite deposition on polymer substrates of different composition and morphology

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materials science and engineering C 2007年第4期27卷 741-745页

作者： Maeda, H. Maquet, V. Chen, Q.Z. Kasuga, T. Jawad, H. Boccaccini, A.R. Department of Materials Science and Engineering Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho Showa-ku Nagoya 466-8555 Japan and Interfaculty Centre for Biomaterials University of Liege B-4000 Liege Belgium Department of Materials Imperial College London Prince Consort Road London SW7 2BP United Kingdom

Calcium carbonate particles of vaterite crystalline structure were deposited on the surface of polymer substrates of different chemistry and morphology by a slurry dipping technique using ethanol as a solvent. Artificial prosthetic fibrous ligaments (polyester-based) and poly(Ε-caprolactone) (PCL) 3-dimensional foams of high porosity were selected as model polymer substrates. The vaterite coated polymers were immersed in simulated body fluid to induce the formation of homogeneous hydroxycarbonate apatite (HCA) layers on the polymer surfaces, which were detected by SEM and XRD. The method offers great potential for inducing bioactive behaviour to normally bioinert polymers. In this investigation, fibrous structures for orthopaedic ligaments and 3-D porous tissue engineering scaffolds were considered and the application of the vaterite coating technique demonstrated. © 2006 Elsevier B.V. All rights reserved.

关键词： Biodegradable polymers

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