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作者： Vogt, Bryan D. Qiang, Zhe Xue, Jiachen Deng, Guodong Karim, Alamgir Cavicchi, Kevin A. Department of Polymer Engineering University of Akron AkronOH44325 United States Material Science Engineering and Commercialization Program Texas State University San MarcosTX78666 United States

ISBN: (纸本)9780841229662

Cooperative assembly of block copolymers (BCPs) with carbonizable polymer precile route to nanoporous carbon materials with well-defined pore size and morphology. There is a subtle balance in reaction kinetics of the carbonizable precursor and ordering of the BCP that controls the extent and length scale over which the ordered structure persists. The use of low molecular weight precursors such as phenolic resin oligomers (resol) enable processing to further order and orient the ordered domains prior to "locking-in" the structure by thermally crosslinking the carbonizable precursor. Processing with solvent, either by exposure to their vapors or use of low volatility solvents in the casting solution, provides one low temperature route to markedly enhance order, but these nanostructures lack long-range orientation. Directional forces through application of a thermal gradient or shear enable large scale orientation of the nanostructures. © 2014 American Chemical Society.

关键词： Block copolymers

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Ground and excited state properties of high performance anthocyanidin dyes-sensitized solar cells in the basic solutions

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AIP Conference Proceedings 2015年第1期1677卷

作者： Eka Cahya Prima Brian Yuliarto Suyatman Hermawan Kresno Dipojono 1Advanced Functional Material Laboratory Engineering Physics Institut Teknologi Bandung Indonesia 2Computational Material Design and Quantum Engineering Laboratory Engineering Physics Institut Teknologi Bandung Indonesia 3International Program on Science Education Universitas Pendidikan Indonesia Indonesia

The aglycones of anthocyanidin dyes were previously reported to form carbinol pseudobase, cis-chalcone, and trans-chalcone due to the basic levels. The further investigations of ground and excited state properties of the dyes were characterized using density functional theory with PCM(UFF)/B3LYP/6-31+G(d,p) level in the basic solutions. However, to the best of our knowledge, the theoretical investigation of their potential photosensitizers has never been reported before. In this paper, the theoretical photovoltaic properties sensitized by dyes have been successfully investigated including the electron injections, the ground and excited state oxidation potentials, the estimated open circuit voltages, and the light harvesting efficiencies. The results prove that the electronic properties represented by dyes’ LUMO-HOMO levels will affect to the photovoltaic performances. Cis-chalcone dye is the best anthocyanidin aglycone dye with the electron injection spontaneity of −1.208 eV, the theoretical open circuit voltage of 1.781 V, and light harvesting efficiency of 56.55% due to the best HOMO-LUMO levels. Moreover, the ethanol solvent slightly contributes to the better cell performance than the water solvent dye because of the better oxidation potential stabilization in the ground state as well as in the excited state. These results are in good agreement with the known experimental report that the aglycones of anthocyanidin dyes in basic solvent are the high potential photosensitizers for dye-sensitized solar cell.

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Corrigendum to "Combination therapy with lenalidomide and nanoceria ameliorates CNS autoimmunity", [Exp. Neurol. 273 (2015), 151-160]

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Experimental neurology 2016年 280卷 121页

作者： Erez Eitan Emmette R Hutchison Nigel H Greig David Tweedie Hasan Celik Soumita Ghosh Kenneth W Fishbein Richard G Spencer Carl Y Sasaki Paritosh Ghosh Soumen Das Susheela Chigurapati James Raymick Sumit Sarkar Srinivasulu Chigurupati Sudipta Seal Mark P Mattson Laboratory of Neurosciences National Institute on Aging Intramural Research Program Baltimore MD 21224 USA. Translational Gerontology Branch National Institute on Aging Intramural Research Program Baltimore MD 21224 USA. Laboratory of Clinical Investigation National Institute on Aging Intramural Research Program Baltimore MD 21224 USA. Laboratory of Immunology National Institute on Aging Intramural Research Program Baltimore MD 21224 USA. Material Science and Engineering College of Medicine University of Central Florida Orlando FL 32816 USA. Arkansas Regional Laboratory Office of Regulatory Affairs U.S. Food and Drug Administration 3900 NCTR Road Building 26 Jefferson AR 72079 USA. Division of Neurotoxicology National Center for Toxicological Research/FDA Jefferson AR 72079 USA. Advanced Materials Processing and Analysis Centre Nanoscience Technology Center Mechanical Materials Aerospace Engineering University of Central Florida Orlando FL 32816 USA. Laboratory of Neurosciences National Institute on Aging Intramural Research Program Baltimore MD 21224 USA Department of Neuroscience Johns Hopkins University School of Medicine Baltimore MD 21205 USA. Electronic address: mark.mattson@nih.gov.

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Temperature-dependent time-resolved photoluminescence study of monocrystalline CdTe/MgCdTe double heterostructures with low defect density

Temperature-dependent time-resolved photoluminescence study ...

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2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

作者： Xin-Hao Zhao Michael J. DiNezza Shi Liu Pathiraja A. R. D. Jayathilaka Odille C. Noriega Thomas H. Myers Yong-Hang Zhang School for Engineering of Matter Transport and Energy Arizona State University Tempe Arizona School of Electrical Computer and Energy Engineering Arizona State University Tempe Arizona Material Science Engineering & Commercialization Program Texas State University San Marcos TX

Confocal photoluminescence scans of monocrystalline CdTe/MgCdTe double heterostructures epitaxially grown on lattice-matched InSb substrates reveal very low twin defect density, below 1 × 10 5 cm -2 . Room-temperature Shockley-Read-Hall (SRH) lifetimes of these samples are determined in the range of 35 ns to 86 ns using time-resolved photoluminescence (TRPL) measurements. Temperature-dependent TRPL measurements show that the carrier lifetime reaches a peak of 910 ns at 200 K. Excitation-dependent PL measurements reveal the radiative recombination coefficient of CdTe to be 4.3 × 10 -9 cm 3 ·s -1 .

关键词： Temperature measurement Thickness measurement Nuclear measurements Abstracts Indexes Molecular beam epitaxial growth

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Graphene-Enhanced Phase Change materials for Thermal Management of Battery Packs

Graphene-Enhanced Phase Change Materials for Thermal Managem...

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IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems

作者： Pradyumna Goli Alexander A. Balandin Nano-Device Laboratory Department of Electrical Engineering and Material Science Engineering Program Bourns College of Engineering University of California Riverside

ISBN: (纸本)9781479952687

Graphene and few-layer graphene reveal exceptionally high thermal conduction properties, which can be used for thermal management. Here we show that incorporation of graphene and few-layer graphene to the hydrocarbon-based phase change material allows one to increase its thermal conductivity by more than two orders of magnitude while preserving its latent heat storage ability. A combination of the sensible and latent heat storage together with the improved heat conduction results in a composite material with the exceptional thermal management capabilities. We show that the graphene-enhanced phase change material can substantially improve the thermal management of Li-ion and other advanced types of batteries.

关键词： Battery Thermal Management Graphene Phase Change material Composite

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Robotic materials with controllable stiffness 19

Robotic materials with controllable stiffness

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19th International Conference on Composite materials, ICCM 2013

作者： McEvoy, M. Farrow, N. Correll, N. Department of Computer Science and University of Colorado Boulder United States Material Science Engineering Program University of Colorado Boulder United States

We present an approach to control the local stiffness of a composite polymer material by using sensing, actuation, computation and communication embedded in a periodic fashion. We call this class of materials "Robotic materials". Initial stiffness is achieved by a polycaprolactone (PCL) grid. Each PCL bar is equipped with a dedicated heating element, thermistor and networked microcontroller that can drive the bar to a desired temperature/stiffness. We present experimental results using a 4×1 grid that can assume different global conformations under the influence of gravity by simply changing the local stiffness in individual parts. We also show how the conformation changes as a function of the temporal order of stiffness transitions while keeping the external force constant. We also explore the potential of such a material to change its configuration upon application of arbitrary forces from built-in actuators using Finite Element Simulation. © QinetiQ Ltd 2013.

关键词： Embedded computation Multi-functional smart composite programmable stiffness

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One-pot fabrication of FePt/reduced graphene oxide composites as highly active and stable electrocatalysts for the oxygen reduction reaction

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Carbon 2014年 68卷 755-762页

作者： Dan Chen Xin Zhao Shanshan Chen Huifeng Li Xinning Fu Qingzhi Wu Shipu Li Yu Li Bao-Lian Su Rodney S. Ruoff State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Biomedical Material and Engineering Center Wuhan University of Technology Wuhan 430070 China Department of Mechanical Engineering and the Materials Science and Engineering Program The University of Texas at Austin 1 University Station C2200 Austin TX 78712 USA Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles B-5000 Namur Belgium Clare Hall College University of Cambridge Cambridge UK

FePt nanoparticles (NPs)/reduced graphene oxide (rG-O) composites have been synthesized using a one-pot strategy without surfactants. Monodisperse FePt NPs were homogenously loaded onto rG-O sheets. By controlling the concentration of dispersed graphene oxide (GO), uniform FePt flower-like nanoclusters can be obtained. FePt/rG-O composites exhibited exceptionally high electrocatalytic performance in the activity and durability for the oxygen reduction reaction (ORR), much superior to that of the commercial Pt/C (60%). The straightforward synthesis of FePt/rG-O composites provides a low-cost and high performance catalyst for the ORR, which is also a promising strategy for the synthesis of various Pt-based bimetallic alloy/rG-O composites for potential uses in catalysis and energy fields.

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Tin (Sn) for enhancing performance in silicon CMOS

Tin (Sn) for enhancing performance in silicon CMOS

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2013 IEEE 8th Nanotechnology materials and Devices Conference, IEEE NMDC 2013

作者： Hussain, Aftab M. Fahad, Hossain M. Singh, Nirpendra Torres Sevilla, Galo A. Schwingenschlögl, Udo Hussain, Muhammad M. Integrated Nanotechnology Lab Electrical Engineering Program of King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia Material Science and Engineering Program King Abdullah Universe of Science and Technology Thuwal 23955-6900 Saudi Arabia

ISBN: (纸本)9781479933877

We study a group IV element: tin (Sn) by integrating it into silicon lattice, to enhance the performance of silicon CMOS. We have evaluated the electrical properties of the SiSn lattice by performing simulations using First-principle studies, followed by experimental device fabrication and characterization. We fabricated high-κ/metal gate based Metal-Oxide-Semiconductor capacitors (MOSCAPs) using SiSn as channel material to study the impact of Sn integration into silicon. © 2013 IEEE.

关键词： Tin

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Comparative analysis of the surface functionalization and texturization of HDPE after H2 and O2 ion plasma immersion

Comparative analysis of the surface functionalization and te...

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2012 International Conference on Environmental and materials engineering, EME 2012

作者： Camacho, Melissa Angelica C. Ramos, Henry J. Material Science and Engineering Program College of Science University of Philippines Diliman Quezon City Philippines National Institute of Physics College of Science University of Philippines Diliman Quezon City Philippines

ISBN: (纸本)9783037856017

An in-house constructed Plasma Enhanced Chemical Vapor Deposition (PECVD) facility was used in this study to facilitate the surface chemistry improvement on High Density Polyethylene (HDPE) sheets and allow an increase in adhesion of copper thin films on HDPE sheets. The material's wet ability and polymer-metal adhesive strength are compared before and after plasma treatment to understand the creation and rearrangement of the functional groups present on the surface of H2 and O2 ion irradiated HDPE sheets. Results showed the detection of O-H, C≡C, C{box drawings double horizontal}C and C-O bonds on the surface of the irradiated samples. H2 ion irradiated sheets, however, showed no surface chemical functionality changes. © (2013) Trans Tech Publications, Switzerland.

关键词： Surface treatment

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Heteroepitaxial growth of ZnO nanosheet bands on ZnCo204 submicron rods toward high-performance Li ion battery electrodes

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Nano Research 2013年第5期6卷 348-355页

作者： Chan Woo Lee Seung-Deok Seo Dong Wook Kim Sangbaek Park Kyoungsuk Jin Dong-Wan Kim Kug Sun Hong DepartmentofMatefials Science andEngineering Seoul National University Seou1151-744 Korea WCU Hybrid Materials Program Department of Materials Science and Engineering Seoul National University Seou1151-744 Korea Department of Material Science and Engineering Ajou University Suwon 443-749 Korea Department of Chemistry Northwestern University 245 Sheridan Road Evanston IL 60208 USA

We report the direct synthesis of ZnC0204 and ZnO/ZnC0204 submicron rod arrays grown on Ni foil current collectors via an ammonia-evaporation-induced method by controlling the ratio of Zn to Co. These three-dimensional （3D） hierar- chical self-supported nanostructures are composed of one-dimensional （1D） ZnCo204 rods and two-dimensional （2D） ZnO nanosheet bands perpendicular to the axis of the each ZnCo204 rod. We carefully deal with the heteroepitaxial growth mechanisms of hexagonal ZnO nanosheets from a crystallographic point of view. Furthermore, we demonstrate the ability of these high-surface-area ZnO/ZnCo204 heterostructured rods to enable improved electrolyte permeability and Li ion transfer, thereby enhancing their Li storage capability （-900 mA.h.g-1 at a rate of 45 mA.h.g-1） for Li ion battery electrodes.

关键词： ZnCo204 submicron rods ZnO nanosheets hierarchicalheterostructure ammonia-evaporation-induced method Li ion battery

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