Takahiko Kojima、Tatsuaki Nakanishi、Ryosuke Harada 等 6 位作者2007-07-30Chemistry - A European Journal
A doubly protonated hydrochloride salt of a saddle-distorted dodecaphenylporphyrin (H2DPP), [H4DPPP]Cl2, forms a porphyrin nanochannel (PNC). X-ray crystallography was used to determine the structure of the molecule, which revealed the inclusion of guest molecules within the PNC. Electron-donating molecules, such as p…
Photochemistry and Electron Transfer StudiesPhotosynthetic Processes and MechanismsPorphyrin and Phthalocyanine Chemistry
James E. Baumgardner、Aaron A. Pesetski、J.M. Murduck 等 6 位作者2007-07-30Applied Physics Letters
The authors consider the suitability of carbon nanotubes for use in analog rf amplifiers, where the linearity of the device is critical. They show that in the limit of large electrostatic gate-channel capacitance, their theory predicts that an Ohmically contacted, ballistic carbon-nanotube-based field-effect transisto…
Quantum and electron transport phenomenaAdvancements in Semiconductor Devices and Circuit DesignCarbon Nanotubes in Composites
Zhongrui Li、Hom Kandel、Enkeleda Dervishi 等 7 位作者2007-07-30Applied Physics Letters
As electrically conductive and optically transparent thin coating material, double-wall carbon nanotube network was found to have better transparency-conductance performance as compared with single-wall carbon nanotube (SWNT) and multiwall carbon nanotube (MWNT). The electronic transportability and optical properties…
Neuroscience and Neural EngineeringMechanical and Optical ResonatorsCarbon Nanotubes in Composites
Takahiro Yamada、Aki Miyake、S. Kishimoto 等 6 位作者2007-07-30Applied Physics Letters
Low resistivity Ga-doped ZnO films were prepared on a glass substrate by ion plating with direct current arc discharge. Thickness dependent changes in the electrical properties of the films are reported, focusing on the thin films of less than 100nm thickness. Structural analyses showed that the thinnest film of 30nm…
Copper-based nanomaterials and applicationsGas Sensing Nanomaterials and SensorsZnO doping and properties
Lai‐Chang Zhang、Haibo Lu、C. Mickel 等 4 位作者2007-07-30Applied Physics Letters
The authors report on ductile ultrafine-grained (Ti0.72Fe0.28)100−xTax (0⩽x⩽4) alloys with not only high fracture strength but simultaneously high yield strength exceeding 2000MPa along with distinct plasticity, which are superior to high-strength Ti-based bulk metallic glasses and bimodal composites. All alloys mainl…
Metallic Glasses and Amorphous AlloysHigh Entropy Alloys StudiesMicrostructure and mechanical properties
Qinyu He、Qing Hao、Gang Chen 等 7 位作者2007-07-30Applied Physics Letters
100% dense bulk TiOx samples have been made by first oxidizing TiO and then direct current induced hot press. It was found that the Seebeck coefficients are negative at room temperature and change to positive at higher temperature for 1<x<1.25, positive at room temperature and change to negative at highe…
Advanced Thermoelectric Materials and DevicesTransition Metal Oxide NanomaterialsGas Sensing Nanomaterials and Sensors
O. Taylor、A. Carrington、J.A. Schlueter2007-07-30Physical Review Letters
We present high resolution heat capacity measurements of the organic superconductors $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{ET}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ and $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{ET}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}$ in f…
Magnetism in coordination complexesRare-earth and actinide compoundsOrganic and Molecular Conductors Research
Shangjie Xu、Ying Luo、Rainer Haag2007-07-30Macromolecular Bioscience
A simple general synthetic concept to build dendritic core-shell architectures with pH-labile linkers based on hyperbranched PEI cores and biocompatible PEG shells is presented. Using these dendritic core-shell architectures as nanocarriers, the encapsulation and transport of polar dyes of different sizes is studied.…
RNA Interference and Gene DeliveryDendrimers and Hyperbranched PolymersAdvanced Polymer Synthesis and Characterization
A.B. Campos、A.Z. Simões、E. Longo 等 8 位作者2007-07-30Applied Physics Letters
A combined experimental and theoretical study was conducted to analyze the photoluminescence (PL) properties of ordered and disordered CaWO4 (CW) and CaMoO4 (CM) powders. Two mechanisms were found to be responsible for photoluminescence emission in CW and CM powders. The first one, in the disordered powders, was cause…
Inorganic Fluorides and Related CompoundsLuminescence Properties of Advanced MaterialsGlass properties and applications
Zhengfei Wang、Q. W. Shi、Qunxiang Li 等 8 位作者2007-07-30Applied Physics Letters
Stimulated by recent advances in isolating graphene, the authors discovered that a quantum dot can be trapped in a Z-shaped graphene nanoribbon junction. The topological structure of the junction can completely confine electronic states. By varying the junction length, the authors can alter the spatial confinement and…
Quantum and electron transport phenomenaGraphene research and applicationsGraphene and Nanomaterials Applications
Yogesh Singh、D. C. Johnston2007-07-30arXiv
Magnetic susceptibility and specific heat versus temperature measurements on polycrystalline samples of Sr3Cr2O8 and the isostructural, nonmagnetic compound Sr3V2O8 are reported. A Curie-Wiess fit to the high-temperature susceptibility data for Sr3Cr2O8 indicates that the Cr atoms are in the rare Cr^5+ (Spin S = 1/2)…
Materials ScienceStrongly Correlated Electrons
Niharika Mohapatra、Kartik K Iyer、Sudhindra Rayaprol 等 4 位作者2007-07-30arXiv
The results of ac and dc magnetic susceptibility isothermal magnetization and heat-capacity measurements as a function of temperature (T) are reported for Sr3NiRhO6 and Sr3NiPtO6 containing magnetic chains arranged in a triangular fashion in the basal plane and crystallizing in K4CdCl6-derived rhombohedral structure.…
Materials ScienceStrongly Correlated Electrons
Daqin Chen、Yuansheng Wang、Yunlong Yu 等 4 位作者2007-07-30Applied Physics Letters
The infrared to ultraviolet upconversion emissions of Tm3+ I61→F43 (346nm) and D21→H63 (362nm) transitions, originating from the five- and four-photon upconversion processes, respectively, were observed in the Tm3+∕Yb3+ codoped precursor glass and glass ceramic containing β-YF3 nanocrystals. The ultraviolet luminescen…
Glass properties and applicationsRadiation Detection and Scintillator TechnologiesLuminescence Properties of Advanced Materials
A Rycerz、J Tworzydło、C. W. J Beenakker2007-07-30Europhysics Letters (EPL)
We have studied numerically the mesoscopic fluctuations of the conductance of a graphene strip (width W larger than length L ), in an ensemble of samples with different realizations of the random electrostatic potential landscape. For strong disorder (potential fluctuations comparable to the hopping energy), the varia…
Advanced Physical and Chemical Molecular InteractionsThermal properties of materialsGraphene research and applications
Juhun Song、Mahabubul Alam、André L. Boehman2007-07-30Combustion Science and Technology
In this work, fuel formulation exerted a strong influence on the properties of diesel particulates leading to differences in oxidation rate. These differences were especially significant when comparing soot derived from the combustion of soybean oil-derived biodiesel fuel (B100) and soot obtained from combustion of a…
Catalytic Processes in Materials ScienceBiodiesel Production and ApplicationsCatalysis and Oxidation Reactions
Bastian Ewald、Ya‐Xi Huang、Rüdiger Kniep2007-07-30Zeitschrift für anorganische und allgemeine Chemie
Abstract A concept for the classification of crystalline (metallo)borophosphates in terms of structural chemistry is proposed and the compounds known to date are classified in an overview. Similarities and differences with (alumo)silicates and Liebau 's classification are discussed with respect to the observation that…
Zeolite Catalysis and SynthesisCrystal Structures and PropertiesChemical Synthesis and Characterization
Peter R. Stone、Jeffrey W. Beeman、Kin M. Yu 等 4 位作者2007-07-30arXiv
We have synthesized Ga1-xMnxAs1-yPy and Ga1-xMnxP1-yNy by the combination of ion implantation and pulsed-laser melting. We find that the incorporation of isovalent impurities with smaller atomic radii leads to a realignment of the magnetic easy axis in Ga1-xMnxP1-yNy/GaP and Ga1-xMnxAs1-yPy/GaAs thin films from in-pla…
Materials Science
E. Katzav、M. Adda-Bedia、M. ben Amar 等 4 位作者2007-07-30arXiv
We investigate propagating fronts in disordered media that belong to the universality class of wetting contact lines and planar tensile crack fronts. We derive from first principles their nonlinear equations of motion, using the generalized Griffith criterion for crack fronts and three standard mobility laws for conta…
cond-mat.dis-nncond-mat.stat-mechMaterials Science
Gang Wu、Xiaoping Yang、Jinming Dong2007-07-30arXiv
Using the first principles calculations we have studied the vibrational modes and Raman spectra of a (10, 10) single-walled carbon nanotube (SWNT) bundle under hydrostatic pressure. Detailed analysis shows that the original radial breathing mode (RBM) of the SWNT bundle disappears after the structural phase transition…
Materials ScienceMesoscale and Nanoscale Physics
Paolo Marconcini、Massimo Macucci2007-07-30arXiv
The dispersion relations of carbon nanotubes are often obtained cross-sectioning those of graphene (zone-folding technique) in a rectangular region of the reciprocal space, where it is easier to fold the resulting relations into the nanotube Brillouin zone. We propose a particular choice of the unit vectors for the gr…
Mesoscale and Nanoscale PhysicsMaterials Science