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Enhancement of photonic density of states in finite graphene multilayers

Physical Review B 2013年第19期88卷 195411-195411页

作者： Ashley M. DaSilva You-Chia Chang Ted Norris Allan H. MacDonald Department of Physics The University of Texas at Austin Austin Texas 78712-1192 USA Applied Physics Program The University of Michigan Ann Arbor Michigan 48109 USA Center for Ultrafast Optical Science The University of Michigan Ann Arbor Michigan 48109 USA Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109 USA

We consider the optical properties of finite systems composed of a series of graphene sheets separated by thin dielectric layers. Because these systems respond as conductors to electric fields in the plane of the graphene sheets and as insulators to perpendicular electric fields, they can be expected to have properties similar to those of hyperbolic metamaterials. We show that under typical experimental conditions graphene/dielectric multilayers have enhanced Purcell factors, and enhanced photonic densities of states in both the terahertz (THz) and midinfrared (mid-IR) frequency range. These behaviors can be traced to the coupled plasmon modes of the multilayer graphene system. We show that these results can be obtained with just a few layers of graphene.

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Nanotubes: Chemical Sharpening, Shortening, and Unzipping of Boron Nitride Nanotubes (Adv. Funct. Mater. 28/2014)

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Advanced Functional Materials 2014年第28期24卷

作者： Yunlong Liao Zhongfang Chen John W. Connell Catharine C. Fay Cheol Park Jae‐Woo Kim Yi Lin National Institute of Aerospace 100 Exploration Way HamptonVirginia 23666–6147 USA Department of Chemistry Department of Physics University of Puerto Rico Rio Piedras Campus San Juan Puerto Rico 00931 USA NASA Langley Research Center Hampton Virginia 23681–2199 USA Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville VA 22904 USA Department of Applied Science The College of William and Mary Williamsburg VA 23185 USA

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Tribological properties of transition metal di-chalcogenide based lubricant coatings

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Frontiers of Materials Science 2012年第2期6卷 116-127页

作者： Jun-Feng YANG Braham PARAKASH Jens HARDELL Qian-Feng FANG Department of Applied Physics and Mechanical Engineering Lulea University of TechnologySE-97187 LuleaSweden Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China

Transition metal di-chalcogenides MX2 （X= S, Se, Te; and M = W, Mo, Nb, Ta） are one kind of solid lubricant materials that have been widely used in industry. The lubricant properties of such lubricant coatings are dependent not only on microstructure, orientation, morphology, and composition of the coatings, but also on the substrate, the interface between substrate and lubricant coatings, and the specific application environment. In this review, the effects of parameters on tribological properties of such kind of lubricant coatings were summarized. By comparing advantages and disadvantages of those coatings, the special treatments such as doping, structural modulation and post-treatment were suggested, aiming to improve the tribologicai performance under severe test conditions （e.g. high temperature, oxidizing atmosphere or humid condition）.

关键词： transition metal di-chalcogenide solid lubricant coating tribologicalproperty

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Pressure dependence of the superconducting transition temperature of the filled skutterudite YFe4P12

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Physical Review B 2013年第2期88卷 024514-024514页

作者： J.-G. Cheng J.-S. Zhou K. Matsubayashi P. P. Kong Y. Kubo Y. Kawamura C. Sekine C. Q. Jin J. B. Goodenough Y. Uwatoko Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan Materials Science and Engineering Program/Mechanical Engineering University of Texas at Austin Austin Texas 78712 USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics College of Humanities and Science Nihon University Tokyo 156-8550 Japan Muroran Institute of Technology 27-1 Mizumoto Muroran-shi 050-8585 Japan

We have studied the pressure dependence of the superconducting transition temperature Tc of the filled skutterudite YFe4P12 under various quasihydrostatic pressures up to 8 GPa. DC magnetization measurements up to 1.2 GPa in a piston-cylinder cell yields a linear increase of Tc with a positive coefficient dTc/dP = 1 K/GPa. Resistivity measurements up to 8 GPa in a cubic anvil apparatus show that Tc increases to 9.3 K at 8 GPa, but the slope decreases gradually with increasing pressure. Besides the previously reported LaFe4P12, YFe4P12 becomes the second filled skutterudite superconductor that exhibits a positive pressure coefficient dTc/dP in a broad pressure range. The observed large dTc/dP > 0 of YFe4P12 can be rationalized by our band-structure calculations that show an enhancement of density of states at Fermi energy and the Hopfield parameter under pressure at least up to 8 GPa. On the other hand, similar calculations predict a dTc/dP < 0 for YRu4P12.

关键词： SUPERCONDUCTING transition temperature SKUTTERUDITE HYDROSTATIC pressure MAGNETIZATION measurement COEFFICIENTS (Statistics) SUPERCONDUCTORS

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Processing and characterization of cyanate ester- MWNT nanocomposites 54

Processing and characterization of cyanate ester- MWNT nanoc...

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54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

作者： Lao, Si-Chon Moon, Tess J. Koo, Joseph H. Horváth, Zsolt E. Materials Science and Engineering Graduate Program University of Texas at Austin 204 E. Dean Keeton St./C2201 Austin TX 78712-0292 United States Department of Mechanical Engineering University of Texas at Austin 204 E. Dean Keeton St./C2200 Austin TX 78712-0292 United States Department of Mechanical Engineering Polymer Nanocomposites Technology Laboratory University of Texas at Austin 204 E. Dean Keeton St./C2200 Austin TX 78712-0292 United States Research Institute for Technical Physics and Materials Science Hungarian Academy of Sciences P.O. Box: 49 H-1525 Budapest Hungary

ISBN: (数字)9781624102233

ISBN: (纸本)9781624102233

In this study, a low viscosity, high performance cyanate ester (CE) resin system was used with non-functionalized and functionalized multiwall carbon nanotubes (MWNTs) to create cyanate ester-MWNT nanocomposites. Effects of three different standard functionalizations (i.e. -OH, -COOH, and -NH2) of MWNTs on their dispersion into the CE resin will be studied. Different mixing instruments, such as a high shear mixer, ultrasonicater, planetary mixer, etc. were used to disperse the nanotubes in the cyanate ester resin matrix. Several processing parameters were examined to produce optimal uniform dispersions of nanoparticles into the resin matrix. The parameters studied were mixing speed and duration, and the combination of different mixing techniques. Polymer nanocomposites (PNCs) morphological microstructures were characterized by transmission electron microscopy (TEM) and high resolution scanning electron microscopy (HR-SEM) to determine whether nanotubes are distributed uniformly within the polymer matrix. Thermogravimetric analysis (TGA) and microscale combustion calorimetry (MCC) were used to study the thermal stability and combustion characteristics of these nanocomposites. Dynamic mechanical thermal analysis (DMTA) was used to determine the glass transition temperature (T g) of the PNCs. © 2012 AIAA.

关键词： High resolution transmission electron microscopy

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Nanofluidics-enabled statistical physics in biosystems: nanoscale electrokinetics, single molecule tug-of-war, and bacterial protein oscillators

Nanofluidics-enabled statistical physics in biosystems: nano...

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第二届全国统计物理与复杂系统学术会议暨第七届海峡两岸统计物理研讨会

作者： Chia-Fu Chou Kuo-Tang Liao Jia-Wei Yeh Alessandro Taloni Jie-Pan Shen Yi-Ren Chang Li-Ling Yang Department of Engineering and System Sciences National Tsing Hua UniversityHsinchu 30013Taiwan Department of Applied Physics Cornell UniversityIthacaNY 14853USA Institute of Physics Research Center for Applied Sciences Academia SinicaTaipei 11529Taiwan Institute of Physics Institute of Physics CNR-IENI Via R.Cozzi 5320125 MilanoItaly Institute of Physics Nanoscience and Technology/Taiwan International Graduate Program Academia SinicaTaipei 11529Taiwan Institute of Physics Genomics Research Center

Given its simplicity in geometry, nanofluidic confinement, in the forms of nanoslits and nanoconstrictions, nevertheless offers unique platforms for the study of molecular biophysics and biosensing applications [1-4].We recently demonstrated a new approach, molecular dam, to enhance mass transport for protein enrichment in nanofluidic channels by nanoscale electrodeless dielectrophoresis [5] under physiological buffer conditions [6, 7].

关键词： Electrokinetics DNA Protein Microfluidics Nanofluidics Dielectrophoresis Entropic recoiling Single molecules

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Lineage structure of the human antibody repertoire in response to influenza vaccination

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医用生物力学 2013年第S1期28卷 36-37页

作者： Ning Jiang Jiankui He Joshua A.Weinstein Lolita Penland Sanae Sasaki Xiao-Song He Patrick C.Wilson Harry B.Greenberg Mark M.Davis Daniel S.Fisher Stephen R.Quake Department of Biomedical Engineering the University of Texas at AustinAustinTXUSA Department of Bioengineering Stanford University School of MedicineStanfordCaliforniaUSA Biophysics Graduate Program Stanford UniversityStanfordCaliforniaUSA Department of Immunology and Microbiology Stanford University School of MedicineStanfordCaliforniaUSA VA Palo Alto Health Care System Palo AltoCaliforniaUSA Department of Medicine Stanford University School of MedicineStanfordCaliforniaUSA Department of Medicine University of Chicago Pritzker School of MedicineChicagoIllinoisUSA Howard Hughes Medical Institute Department of Applied Physics Stanford UniversityStanfordCaliforniaUSA Department of Biology Stanford UniversityStanfordCaliforniaUSA

The adaptive immune system produces a large and diverse set of antibodies,each with an individual evolutionary and clonal *** so called"antibody repertoire"protects each individual against insults such as infection and cancer,and responds to vaccination with B cell proliferation in response to the antigenic *** and antigen-specific FACSbased analysis have given us much insight on how the immune system generates the complex and diverse immune response required to protect the body from the wide variety of potential ***,these methods have not been sufficient to make global and unbiased characterizations of the clonal structure of the immune system of a particular individual。

关键词： vaccination clonal antigenic diverse insight stimulation evolutionary immunized protect vaccine

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A partially permeable mixed-mode crack embedded in a functionally graded magneto electro elastic layer

A partially permeable mixed-mode crack embedded in a functio...

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13th International Conference on Fracture（ICF13）

作者： Mongi Rekik Sami El-Borgi Zoubeida Ounaies Applied Mechanics and Systems Research Laboratory Tunisia Polytechnic School University of CarthageB.P.743.La Marsa 2078Tunisia Applied Mechanics and Systems Research Laboratory Tunisia Polytechnic SchoolUniversity of CarthageB.P.743La Marsa 2078Tunisia Texas A&M University at Qatar Engineering BuildingMechanical Engineering ProgramDohaQatar Department of Mechanical Engineering the Pennsylvania State UniversityUniversity ParkPA 16802USA

This paper focuses on the study of the influence of a partially permeable mixed-mode crack on the coupled response of a functionally graded magneto electro elastic material(FGMEEM).The crack is embedded in a 2D layer subjected to magneto electro mechanical *** material is graded in the direction orthogonal to the crack plane and is modeled

关键词： A partially permeable mixed-mode crack embedded in a functionally graded magneto electro elastic layer

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Experimental Observations of Group Synchrony in a System of Chaotic Optoelectronic Oscillators

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Physical Review Letters 2013年第6期110卷 064104-064104页

作者： Caitlin R. S. Williams Thomas E. Murphy Rajarshi Roy Francesco Sorrentino Thomas Dahms Eckehard Schöll Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Physics University of Maryland College Park Maryland 20742 USA Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA Department of Mechanical Engineering University of New Mexico Albuquerque New Mexico 87131 USA Institut für Theoretische Physik Technische Universität Berlin 10623 Berlin Germany

We experimentally demonstrate group synchrony in a network of four nonlinear optoelectronic oscillators with time-delayed coupling. We divide the nodes into two groups of two each, by giving each group different parameters and by enabling only intergroup coupling. When coupled in this fashion, the two groups display different dynamics, with no isochronal synchrony between them, but the nodes in a single group are isochronally synchronized, even though there is no intragroup coupling. We compare experimental behavior with theoretical and numerical results.

关键词： OPTOELECTRONICS MAGNETIC couplings SYNCHRONIZATION SIGNAL processing -- Digital techniques PERTURBATION (Quantum dynamics)

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Suspended Si/air high contrast subwavelength gratings for long-wavelength infrared reflectors

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Proceedings of SPIE - The International Society for Optical engineering 2013年 8633卷

作者： Foley, Justin M. Phillips, Jamie D. Applied Physics Program University of Michigan 450 Church St. Ann Arbor MI 48109-1040 United States Electrical Engineering and Computer Science Department University of Michigan 1301 Beal Ave. Ann Arbor MI 48109-2122 United States

ISBN: (纸本)9780819494023

We report broadband reflectance in the long-wavelength infrared (LWIR, 8-12 μm) utilizing suspended-Si, high-index-contrast subwavelength gratings (HCGs). Iterative design optimization using finite element analysis software has been performed accounting for silicon's wavelength-dependent index of refraction and extinction coefficient. Grating arrays were fabricated using commercial silicon-on-insulator (SOI) substrates, photolithography and reactive ion etching; subsequent selective wet etching of SiO2was used to provide suspended Si/air gratings. Fourier transform infrared (FTIR) spectroscopy demonstrates broadband, polarization-dependent reflectance between 8.5 and 12 μm, which agrees with the simulated response. © 2013 SPIE.

关键词： Infrared radiation Diffraction gratings Finite element method Fourier transform infrared spectroscopy Hyperspectral imaging Infrared devices Reactive ion etching Reflection Refractive index Silica Silicon on insulator technology Silicon oxides Broadband reflector Filter HCG reflector High contrast gratings Long wavelength infrared LWIR

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