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Publisher’s Note: “Guided-mode-resonance-coupled plasmonic-active SiO2 nanotubes for surface enhanced Raman spectroscopy” [Appl. Phys. Lett. 100, 191114 (2012)]

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Applied Physics Letters 2012年第5期101卷

作者： Xiaobin Xu Dihan Hasan Lei Wang Swapnajit Chakravarty Ray T. Chen D. L. Fan Alan X. Wang 1Materials Science and Engineering Program Texas Materials Institute University of Texas at Austin Austin Texas 78712 USA 2School of Electrical Engineering and Computer Science Oregon State University Corvallis Oregon 97331 USA 3Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology 430074 Wuhan China 4Microelectronic Research Center University of Texas at Austin Austin Texas 78758 USA 5Omega Optics Inc. Austin Texas 78759 USA 6Department of Mechanical Engineering University of Texas at Austin Austin Texas 78712 USA

This article was originally published online on 10 May 2012 with an incorrect affiliation for co-author D. L. Fan and an incorrect footnote designation for co-a

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Biodegradable Microfluidic Scaffolds with Tunable Degradation Properties from Amino Alcohol-based Poly(ester amide) Elastomers

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MRS Online Proceedings Library 2011年第1期1299卷 1-6页

作者： Jane Wang Tatiana Kniazeva Carly F. Campbell Robert Langer Jeffrey S. Ustin Jeffrey T. Borenstein Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge USA Biomedical Engineering Charles Stark Draper Laboratory Cambridge USA Program of Polymer Science and Technology Massachusetts Institute of Technology Cambridge USA Department of Chemical Engineering Massachusetts Institute of Technology Cambridge USA Trauma Surgery Cleveland MetroHealth Hospital Cleveland USA

Biodegradable polymers with high mechanical strength, flexibility and optical transparency, optimal degradation properties and biocompatibility are critical to the success of tissue engineered devices and drug delivery systems. In this work, microfluidic devices have been fabricated from elastomeric scaffolds with tunable degradation properties for applications in tissue engineering and regenerative medicine. Most biodegradable polymers suffer from short half life resulting from rapid and poorly controlled degradation upon implantation, exceedingly high stiffness, and limited compatibility with chemical functionalization. Here we report the first microfluidic devices constructed from a recently developed class of biodegradable elastomeric poly(ester amide)s, poly(1,3-diamino-2-hydroxypropane-co-polyol sebacate)s (APS), showing a much longer and highly tunable in vivo degradation half-life comparing to many other commonly used biodegradable polymers. The device is molded in a similar approach to that reported previously for conventional biodegradable polymers, and the bonded microfluidic channels are shown to be capable of supporting physiologic levels of flow and pressure. The device has been tested for degradation rate and gas permeation properties in order to predict performance in the implantation environment. This device is high resolution and fully biodegradable; the fabrication process is fast, inexpensive, reproducible, and scalable, making it the approach ideal for both rapid prototyping and manufacturing of tissue engineering scaffolds and vasculature and tissue and organ replacements.

关键词： biomaterial microelectro-mechanical (MEMS) polymer

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Absorption Enhancement in Plasmonic Solar Cells by Incorporation of Periodic Nanopatterns

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MRS Online Proceedings Library 2011年第1期1322卷 1-12页

作者： W Wang S Wu Y. L. Lu Kitt Reinhardt S. C. Chen Materials Science and Engineering The University of Texas at Austin Austin USA Laser Optics Research Center Physics Department United States Air Force Academy CO USA United States Air Force Office of Scientific Research AFOSR/NE Arlington USA NanoEngineering Department University of California San Diego USA

Currently, the performances of thin film solar cells are limited by poor light absorption and carrier collection. In this research, large, broadband, and polarization-insensitive light absorption enhancement was realized via incorporation of different periodic nanopetterns. By studying the enhancement effect brought by different materials, dimensions, coverage, and dielectric environments of the metal nanopatterns, we analyzed the absorption enhancement mechanisms as well as optimization criteria for our designs. A test for totaling the absorption over the solar spectrum shows an up to ∼30% broadband absorption enhancement when comparing to conventional thin film cells.

关键词： photovoltaic simulation absorption

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Autonomous passive light tracking utilizing single-wall carbon nanotube enhanced opto-thermo-mechanical elastomer actuators

Autonomous passive light tracking utilizing single-wall carb...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： Ye Liu Chensha Li Chi-Wei Lo Hongrui Jiang Electrical and Computer Engineering Department University of Wisconsin Madison Madison WI USA Materials Science Program University of Wisconsin Madison Madison WI USA

We have developed novel opto-thermo-mechanical actuators by effectively distributing a significant amount of single-wall carbon nanotube (SWCNT, up to 0.7%w/w) into liquid crystal elastomer (LCE) matrices. These SWCNT/LCE actuators exhibit a great potential to be utilized in MEMS applications, as they respond to a wide spectrum of visible/near-infrared light, and possess a large reversible compressive strain (up to 35%) when stimulated. Autonomous and passive light tracking is demonstrated here as one of the applications. With a simple design, the actuators are able to adaptively tilt a solar cell towards the light source by a degree of ~15° (with an incident light intensity of 1.6 kW/m 2 ). As a result, the photocurrent output of the solar cell is significantly enhanced (up to 247.10%) without any other control system or external energy source.

关键词： Actuators Photovoltaic cells Photoconductivity Films Carbon nanotubes Light sources Micromechanical devices

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Electron Microscopy Study of Morphology and Composition of a Ferrisilicate Catalyst

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MRS Online Proceedings Library 2011年第1期111卷 155-160页

作者： Roseann Csencsits Ronald Gronsky Vinayan Nair Rosemarie Szostak Center for Advanced Materials Materials and Chemical Sciences Division Lawrence Berkeley Laboratory and Materials Science and Mineral Engineering Department University of California Berkeley USA Union Carbide Company Tarrytown USA Zeolite Research Program Georgia Tech Research Institute Georgia Institute of Technology Atlanta USA

The effects of various synthesis conditions on the structure and composition of ferrisilicate analogs of zeolite ZSM-5 were considered. Scanning electron microscopy (SEM) was used to determine the particles size distributions and morphologies. Particle sizes vary from tenths of a micron to several microns, depending on degree of agitation during crystal growth, while morphology is additionally dependent on the concentration of iron in the gel during crystallization. X-ray emissive spectroscopy (XES) performed in the transmission electron microscope (TEM) was used to determine their composition variation. The distribution of iron amongst the crystals is more homogeneous if the gel is stirred and it does not depend on particle size.

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Dependence of SnAgCu solder joint properties on solder microstructure

Dependence of SnAgCu solder joint properties on solder micro...

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Electronic Components and Technology Conference (ECTC)

作者： B. Arfaei T. Tashtoush N. Kim L. Wentlent E. Cotts P. Borgesen Binghamton University Binghamton NY US Department of Systems Science & Industrial Engineering Binghamton University Binghamton NY USA Department of Physics and Materials Science Program Binghamton University Binghamton NY USA

It is well known that variations in the microstructure of lead free solders greatly affect their thermomechanical properties. Sn grain size, orientation and number, as well as secondary Ag 3 Sn and Cu 6 Sn 5 precipitate sizes and numbers, are all seen to influence the mechanical response of solder joints during isothermal and thermal cycling. The solidification temperature of a SnAgCu solder joint dramatically affects its microstructure. Generally, smaller solder balls (e.g. CSP) undercool more, and thus their microstructure and properties are very different than larger solder balls (e.g. BGA). We report results of a study of the effects of solder joint volume, and pad sizes, on the microstructure and thermomechanical properties of solder joints. Solder joint shapes and dimensions spanned the ranges typical of BGA and CSP assemblies. Temperatures of solidification during cool-down were quantified by differential scanning calorimetry. Sn grain structures were characterized by crossed polarizer microscopy and scanning electron microscopy with electron backscattered diffraction. Precipitate sizes and distributions were measured using backscattered scanning electron microscopy. Corresponding properties, including hardness, strength and fatigue resistance were measured before and after aging for various lengths of times at temperatures up to 125°C. Smaller solder joints on smaller pads were shown to be harder and stronger than larger ones, but to age faster and eventually end up softer and weaker.

关键词： Soldering Tin Aging Temperature measurement Microstructure Copper Fatigue

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Optimization of defect hole placement in resonant cavities

Optimization of defect hole placement in resonant cavities

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作者： Kang, Christopher Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University 37235 United States IBM T.J. Watson Research Center Yorktown Heights NY 10536 United States

We demonstrate the resonance wavelength and quality factor dependence of 50nm defect-hole placement within photonic crystal L3 microcavities. Proper placement of defect-holes leads to a 12% increase in photonic crysta... 详细信息

ISBN: (纸本)9781557529107

关键词： Photonic crystals

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First-principles study of electronic, vibrational, elastic, and magnetic properties of FeF2 as a function of pressure

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Physical Review B 2012年第13期85卷 134110-134110页

作者： S. López-Moreno A. H. Romero J. Mejía-López A. Muñoz Igor V. Roshchin Facultad de Ciencias Universidad Nacional Autónoma de México Apdo. Post. 70-646 México D. F. 04510 México CINVESTAV-Queretaro Libramiento Norponiente No 2000 Real de Juriquilla 76230 Queretaro Qro México Facultad de Física Pontificia Universidad Católica Av. Vicuña Mackenna 4860 Santiago Chile Departamento de Física Fundamental II Instituto de Materiales y Nanotecnología Universidad de La Laguna La Laguna 38205 Tenerife Spain Department of Physics and Astronomy Texas A&M University College Station Texas 77843-4242 USA Materials Science and Engineering Program Texas A&M University College Station Texas 77843-3003 USA

We report systematic ab initio calculations of the electronic band structure, phonon dispersion relation, and the structural characterization of FeF2 in the rutile (P42/mnm) structure as well as in several high-pressure phases by means of the generalized gradient approximation (GGA)+U approximation. Using the phonon dispersion relations, we calculated the Gibbs free energy and evaluated the phase transitions at 300 K, at which most experimental measurements are performed. Calculated Raman and infrared vibrational modes, lattice parameters, and electronic structure for all considered crystalline structures are compared with available experimental data. Our calculations show that at 5.33 GPa, the FeF2 undergoes a second-order proper ferroelastic phase transition, rutile → CaCl2-type structure. This result is supported by the softening of the elastic shear module Cs in the rutile phase, the softening (hardening) of the B1g (Ag) Raman active mode in the rutile (CaCl2-type) structure near the transition pressure, and the decrease of the square of the spontaneous strain ess from the CaCl2-type structure. This demonstrates that the rutile → CaCl2-type phase transition is driven by the coupling between the Raman active B1g mode and shear modulus Cs. At 8.22 GPa, the CaCl2-type structure undergoes a first-order phase transition to the Pbca phase, a distorted fcc Pa3¯ phase with a volume reduction of ΔV≈7%, as reported in experiments. Upon further increase of the pressure, the Pbca phase transforms to a Fmmm phase othorhombic center-type structure at ∼20.38 GPa, with ΔV≈2.5%. Finally, at 25.05 GPa, there is a phase transition to the orthorhombic cotunnite structure (Pnma space group), with ΔV≈5.8%, which is stable up to 45 GPa, the largest considered pressure. The coordination number for the Fe ion in each phase is 6, 6, 6, 8, and 9 for rutile, CaCl2-type, Pbca, Fmmm, and cotunnite structures, respectively. The evolution of the band gap, phonon frequencies, and magnetic momen

关键词： IRON compound synthesis MAGNETIC properties of metals ELECTRONIC band structure CRYSTAL structure GIBBS' free energy PHASE transformations (Physics) ELASTICITY VIBRATION (Mechanics)

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Development of continuous wrapping tantalum barriers for internal-tin Nb3Sn multi-filamentary wires

Development of continuous wrapping tantalum barriers for int...

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2011 International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2011

作者： Chen, Wu Ming Yavuz, Mustafa Fu, Xue Kui Kambe, Shiro McIntyre, Peter Jin, Jian Xun School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia Waterloo Institute for Nanotechnology University of Waterloo Waterloo ON N2L 3G1 Canada Cankaya University Ankara Turkey Human Sensing Program Graduate School of Science and Engineering Yamagata University 4-3-16 Johnan Yonezawa 992-8510 Japan Department of Physics Texas A and M University TX United States Center of Applied Superconductivity and Electrical Engineering University of Electronic Science and Technology of China China

ISBN: (纸本)9781424478521

A process, continuous wrapping tantalum barrier, has been developed and investigated in order to reduce the manufacturing cost. By avoiding inserting expensive tantalum tube, a long sheet barrier was directly used to wrap a prior restack. In this work, a tantalum barrier with 20 % overlap was wrapped onto sub-elements. Then 18-filament Nb3Sn plus 1 copper core restack billet was successfully drawn down and extruded into round wire as thin as a diameter of 0.84 mm. The longitudinal and cross-sectional images revealed most of barriers were continuous and intact. However, further experiments are needed to optimize the process in order to keep the all barriers continuous and intact after manufacturing. © 2011 IEEE.

关键词： Tin alloys

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Synthesis of Graphene-CNT Hybrid Nanostructures

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MRS Online Proceedings Library 2011年第1期1344卷 1-5页

作者： Maziar Ghazinejad Shirui Guo Rajat K. Paul Aaron S. George Miroslav Penchev Mihrimah Ozkan Cengiz S. Ozkan Department of Mechanical Engineering University of California Riverside U.S.A. Department of Electrical Engineering University of California Riverside U.S.A. Department of Chemistry University of California Riverside U.S.A. Materials Science and Engineering Program University of California Riverside U.S.A.

Using chemical vapor deposition technique, a novel 3D carbon nano-architecture called a pillared graphene nanostructure (PGN) is in situ synthesized. The fabricated novel carbon nanostructure consists of CNT pillars of variable length grown vertically from large-area graphene planes. The formation of CNTs and graphene occurs simultaneously in one CVD growth treatment. The detailed characterization of synthesized pillared graphene shows the cohesive structure and seamless contact between graphene and CNTs in the hybrid structure. The synthesized graphene-CNT hybrid has a tunable architecture and attractive material properties, as it is solely built from sp2 hybridized carbon atoms in form of graphene and CNT. Our methodology provides a pathway for fabricating novel 3D nanostructures which are envisioned for applications in hydrogen storage, nanoelectronics, and supercapacitors.

关键词： C chemical vapor deposition (CVD) (chemical reaction) nanostructure

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