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。
We reveal the hydrogen isotope effect of three chemical reactions, i.e, the reflection, the absorption and the penetration ratios, by classical molecular dynamics simulation with a modified Brenner's reactive empirical bond order (REBO) potential potential. We find that the reflection by pi-electron does not depend on…
We present scanning tunneling microscopy (STM) images of single-layer graphene crystals examined under ultrahigh vacuum conditions. The samples, with lateral dimensions on the micrometer scale, were prepared on a silicon dioxide surface by direct exfoliation of crystalline graphite. The single-layer films were identif…
In the present article, the characteristics of the polyaniline (PANI)-fullerene-nematic liquid crystal (NLC) have been studied. It has been noticed that dealing with nanostructured medium based on fullerene-doped PANI sufficiently accelerates transitional processes in a dispersed LC structure, causing the mesophase re…
The theoretical description of the optical properties of confined chiral liquid crystals (CLC) under action of a varying external agent for light propagating along the chiral axes is performed. The observed jumps and the hysteresis of the optical properties of confined CLC under action of a varying external agent are…
In the present research, we consider nanoporous silicon filled with nematic liquid crystal (LC) n-pentyl-n' -cyanobiphenyl (5CB) as a specimen of hybrid systems with high quantum yield of fluorescence (FL). The steady-state and time-resolved FL spectra of this system excited by a nitrogen laser (λ = 337 nm) are measur…
Zinc oxide (ZnO) films were grown on bulk ZnO substrates by the RF magnetron sputtering system. High resolution x-ray diffraction and photoluminescence spectra of the homoepitaxial films showed sharp and intense peaks with full-width at half-maximum values of 10–65 arcsec ((0 0 0 2) peak) and 106–116 meV (band edge em…
We sketch a rigorous derivation of Fourier's law from a system of closure equations for a nonequilibrium stationary state of a Hamiltonian system of coupled oscillators subjected to heat baths on the boundary. The local heat flux is proportional to the temperature gradient with a temperature dependent heat conductivit…
We report results of the optical characterization of dried thin films obtained from the well-aligned nematic phase of a lyotropic chromonic liquid crystal (LCLC) by two different deposition techniques. The first one, the electrostatic layer-by-layer deposition technique, was used to prepare aligned LCLC films of a nan…
Hard x-ray photoemission spectroscopy has been used to study intrinsic core-level electronic structure evolution of heavily boron-doped superconducting diamond films made with a microwave plasma-assisted chemical-vapor deposition method. The boron concentration dependent $\mathrm{C}\phantom{\rule{0.2em}{0ex}}1s$ core-…
Abstract Charge transfer (CT) resonance mechanisms of 2,2′‐bipyridine (2,2′‐BiPy), 2,4′‐bipyridine (2,4′‐BiPy), and 4,4′‐bipyridine (4,4′‐BiPy) on silver nanoparticle surfaces have been comparatively investigated by means of surface‐enhanced Raman scattering (SERS) at the excitation wavelengths of 457, 514, 633, and 7…
Bi 3 Ti 1 − x W x Nb O 9 + δ (x=0.15) (WBTN-15) ceramics were prepared using the solid state reaction method, and the behaviors of oxygen vacancies were confirmed and investigated by annealing the ceramic samples in O2 and Ar gas atmospheres. Dielectric measurements showed that oxygen vacancies had great contributions…
Several test methods exist for determining the water vapour permeability or resistance of textile fabrics or garments. The differences and interrelationships between these methods are not always clear, which presents a problem in comparing results from different test methods. This study is aimed at investigating the r…
We investigated the thermal hysteresis of a pelleted sample of the spin-crossover compound $[\mathrm{Fe}{(\mathrm{N}{\mathrm{H}}_{2}\text{\ensuremath{-}}\mathrm{trz})}_{3}]{\mathrm{Br}}_{2}$ by means of spectroscopic ellipsometry, in the temperature range $264--358\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The ellipsomet…
Highly conductive PrBaCo2O5.5+δ thin films were grown on (001) SrTiO3 by pulsed laser deposition. Microstructural studies from synchrotron x-ray diffraction and transmission electron microscopy reveal that the as-grown PrBaCo2O5.5+δ films are a-axis oriented with excellent single crystallinity. Two domain structures w…
Electron emission from multiwall carbon nanotubes (CNTs) with a cone-shaped tip, on the apex of which five pentagons are present, has been studied by field emission microscopy (FEM). Two types of FEM patterns were observed: one is a well-defined “pentagon” pattern that is typically observed for ordinal multiwall CNTs…
Evidence for ferromagnetism at the surface of a $\mathrm{La}\mathrm{Co}{\mathrm{O}}_{3}$ single crystal is reported using a scanning superconducting quantum interference device (SQUID) microscope. Stray magnetic flux detected with the scanning SQUID shows typical ferromagnetic behavior in $\mathrm{La}\mathrm{Co}{\math…
Thin TiO2 films with rutile short-range atomic order grown at room temperature have a nanostructure of rectangular domains based on a faulted rutile structure. Raman scattering by nanomosaic rutile in single layer TiO2 and TiO2–Al2O3 nanolaminate films is reported here. In all architectures, the Eg phonon mode frequen…
Sputter-deposited Ba0.5Sr0.5TiO3 films on (001) MgO were characterized for their dielectric properties with different lattice structures. With varying Ar:O2 ratios during deposition, the films showed either in-plane (c<a) or out-of-plane (c>a) tetragonal distortions, significantly affecting the dielectri…
Zn O ∕ Mg 0.1 Zn 0.9 O multiquantum-well (MQW) structures were grown on ZnO substrates by molecular beam epitaxy. Abrupt interfaces and well/barrier width in the MQWs were confirmed by x-ray diffraction measurement and transmission electron microscopy. The transition energy of the localized exciton in the ZnO∕Mg0.1Zn0…
Magnetoresistance (MR) of a nanostructured material, monodisperse Fe3O4 nanospheres of about 200nm coated with thin SiO2 and compactly cold pressed and sintered, has been investigated. A high MR, up to 10.8% at 1T and 17% at 8T, has been observed at 100K. This enhanced MR is likely arising from the spin-polarized tunn…