Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Highly ordered mesoporous silica can be regenerated from a mesoporous carbon CMK-3 that is a negative replica of mesoporous silica SBA-15, indicating reversible replication between carbon and inorganic materials.
The local electronic structure of N atoms in a diluted GaAs1-xNx (x=3%) alloy, in view of applications in optoelectronics, is determined for the first time using soft-X-ray absorption (SXA) and emission (SXE). Deviations from crystalline GaN, in particular in the conduction band, are dramatic. Employing the orbital ch…
Effect of contact interfaces, between metallic single-wall carbon nanotubes (SWCNT) and external electrodes made also of nanotubes, on the electrical conductance is studied. A tight-binding model with both diagonal and off-diagonal disorder, a recursive Green function technique as well as the Landauer formalism are us…
We synthesize, for the first time, using sol−gel technique and without doping any trivalent impurities, monodispersed, spherical ZrO 2 particles in size range of ∼500−600 nm, exhibiting metastable tetragonal crystal structure at room temperature. It is revealed using high-resolution transmission electron microscopy th…
Due to the complex interplay of magnetic, structural, electronic, and orbital degrees of freedom, biaxial strain is known to play an essential role in the doped manganites. For coherently strained La(2/3)Ca(1/3)MnO(3) thin films grown on SrTiO(3) substrates, we measured the magnetotransport properties both parallel an…
Planar light-emitting diodes (LEDs) fabricated within a single high-mobility quantum well are demonstrated. Our approach leads to a dramatic reduction of radiative lifetime and junction area with respect to conventional vertical LEDs, promising very high-frequency device operation. Devices were fabricated by UV lithog…
Reduction factors (RF), that are needed when modeling vibronic systems by an effective Hamiltonian in an electronic basis, are calculated for the T_1u x h_g Jahn-Teller (JT) system. The results obtained will be useful when modeling the fullerene anion C_60-, which is believed to exhibit a T_1u x h_g JT effect in its g…
Two series of uniaxial tensile tests are performed on isotactic polypropylene with the strain rates ranging from 5 to 200 mm/min. In the first series, injection-molded specimens are used without thermal pre-treatment, whereas in the other series, the samples are annealed for 51 h at 160C prior to testing. A constituti…
Photoluminescence excitation spectroscopy and scanning-tunneling spectroscopy are used to study the electronic states in CdSe quantum rods that manifest a transition from a zero-dimensional to a one-dimensional quantum-confined structure. Both optical and tunneling spectra show that the level structure depends primari…
This work demonstrates multistage complementary NOR, OR, NAND, and AND logic gates and ring oscillators (frequency ∼220 Hz) with arrays of p- and n-type nanotube field effect transistors (FETs). The demonstration is made possible by progress in three aspects of nanotube synthesis and integration. First, patterned grow…
Carbon nanotubes have unique properties that make them a most promising system on which to base molecular electronics. We briefly review the electrical characteristics of carbon nanotubes, and then focus on carbon nanotube field-effect transistors (CNTFETs). Procedures by which hole-transport, electron-transport and a…
In this work, X-ray studies of the amorphous oxide films obtained by thermal evaporation of WO(3) powder in a vacuum and by anodic oxidation were carried out. X-ray diffraction patterns were obtained in the symmetric reflection geometry on a DRON-4 diffractometer (Mo K(alpha) radiation, LiF monochromator) in automatic…
Abstract Blends of maleated polypropylene with maleic anhydride (PP–MAH) and maleated styrene–butadiene–styrene triblock copolymer with maleic anhydride (SBS–MAH) were compatibilized with 4,4′‐diaminediphenylmethane, at various concentrations, as the coupling agent for the functionalized polymers. Their properties wer…
Structural proteomics aims to provide one or more representative three-dimensional (3D) structures for every structural domain family in nature. As part of an international effort in structural proteomics, the Northeast Structural Genomics Consortium has targeted clusters of strongly conserved eukaryotic protein famil…
Calculations of traditional wave function and DFT based reactivity descriptors are reported for the nanocluster [(RSn)12O14(OH)6]2+ (R = CH3) in order to get insight into the factors determining the exact nature of its interactions with anions or neutral nucleophiles (F−, Cl−, OH−, H2O, acetone, DMSO). Two levels of c…
A quantitative measurement method of the linear dielectric constant using cantilever-type scanning nonlinear dielectric microscopy (SNDM) is reported. Using this method, we succeed in quantitatively measuring the linear dielectric constant distribution of TiO 2 –Bi 2 Ti 4 O 11 ceramics with higher resolution than that…
Silver and silica nanoparticles stabilised by long chain alkanes have been prepared and characterised using 1H-NMR, transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). Upon solvent evaporation, the alkane stabilised silica and silver nanoparticles self-assemble into close-packed two- and th…
Abstract Physically crosslinked hydrogels are formed upon mixing equal amounts of aqueous solutions of dextran grafted with L ‐lactic acid oligomers and dextran grafted with D ‐lactic acid oligomers. In this paper, the dex‐lactate hydrogels are analyzed by X‐ray diffraction to provide evidence that hydrogel formation…
The dynamics of atactic polypropylene has been explored with quasielastic neutron scattering (QENS) measurements in the temperature range 4−460 K and momentum transfer range q = 0.2−2.25 Å -1 . In parallel, molecular dynamics simulations of the same polymer have been conducted in the temperature range 260−600 K, using…
We present new time-resolved powder diffraction data measured in situ during the hydrothermal crystallisation of two families of crystalline inorganic materials. In the first study, we have used time-resolved energy-dispersive X-ray diffraction (EDXRD) to follow the formation of zeolitic zinc phosphates from amine pho…