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。
The energy dependence of the mean free path $\ensuremath{\lambda}(E)$ in graphite at low kinetic energies (below $\ensuremath{\sim}50\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$) is studied using the synchrotron radiation excited Si $2p$ core level photoemission signal from a SiC substrate attenuated by an epitaxial graphi…
Abstract Delftia acidovorans P4a (DSMZ 10474) was grown in mineral medium on acetic acid at pH 8.0 without an additional supply of nutrients like yeast extract or polypeptone. Using acetic acid and γ‐butyrolactone (GBL), copolymers with a 4HB content from 2–90 mol % were detected in batch experiments, depending on the…
Detailed magnetization measurements $M(T,H,\ensuremath{\theta})$, were performed on single crystals of TbPtIn and TmAgGe (both members of the hexagonal ${\mathrm{Fe}}_{2}\mathrm{P}∕\mathrm{Zr}\mathrm{Ni}\mathrm{Al}$ structure type) for the magnetic field $H$ applied perpendicular to the crystallographic $c$ axis. Thes…
We present results on the in situ, two-dimensional growth (as opposed to the more commonly encountered island-coalescence mechanism) of continuous epitaxial Cu2O films on MgO(011) using dc facing-magnetron sputtering from metallic Cu targets in an oxygen/argon atmosphere. Film growth was studied as a function of depos…
Abstract The NCO‐terminated prepolymers, prepared by reacting a mixture of poly(tetramethylene glycol) and fumed nanosilica with 4,4′‐diphenylmethane diisocyanate, were chain‐extended with 1,4‐ butanediol to yield polyurethane‐silica nanocomposites. The nanosilica particles were well dispersed in the polyurethane matr…
Abstract The purpose of this project was to obtain new composites using filler and resin obtained from renewable resources, combining low cost and good mechanical properties. The matrix consisted of a polyester resin synthesized from linseed oil and further crosslinked with styrene in a peroxide‐initiated reaction. Co…
Abstract The choice of plasma gas can determine the interaction between material and plasma and therefore the applications of the treated materials. Nitrogen plasma can integrate functional groups such as primary amines and carbon dioxide plasma can incorporate carboxylic groups on the surface of polymers. For specifi…
Optical second-harmonic generation (SHG) is used as a noninvasive probe of the interfaces of Si nanocrystals (NCs) embedded uniformly in an ${\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ matrix. Measurements of the generated SH mode verify that the second-harmonic polarization has a nonlocal dipole form proportional to $(\sta…
The possibility of negative optical path length in left-handed media (LHM) is shown to lead to complete suppression of spontaneous emission of an atom in front of a mirror with a layer of LHM. For the same reason two atoms put at the foci of a perfect lens formed by a parallel LHM slab [J. B. Pendry, Phys. Rev. Lett.…
Polarized Raman scattering on single crystals of has been used to determine the symmetry properties and frequencies of the Raman-active vibrational modes over the temperature range from 300 to 425 K, i.e., up to the melting point . Significant softening (by up to 6%) is observed in the modes involving rigid translatio…
Polymer brushes are grown on both hydrophobic and hydrophilic nanocrystals by surface-initiated atom-transfer radical polymerization. The poly{[2-(dimethylamino)ethyl] methacrylate}-coated nanocrystals are well dispersed in both water and most organic solvents without detectable aggregation and deterioration of their…
We report on the optimization of the upconversion photoluminescence in films of conjugated polymers doped with platinum porphyrin. The upconversion emission was observed to take place at pump intensities as low as 0.5kW∕cm2. Comparison between the photoluminescence integral intensity of polyfluorene and ladder-type pe…
We perform analysis of the band structure, phonon dispersion, and electron-phonon interactions in three types of small-radius carbon nanotubes. We find that the (5,5) nanotube can be described well by the zone-folding method and the electron-phonon interaction is too small to support either a charge-density wave or su…
Using x-ray and neutron scattering, we have studied the structural and magnetic properties of the single-layer manganite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{1+x}{\mathrm{MnO}}_{4}(0\ensuremath{\leqslant}x<0.7)$. Single crystals were grown by the floating-zone method at $18\phantom{\rule{0.3em}{0ex}}\mat…
The electronic properties and lattice dynamics of the sodium alanate phases have been studied by the density functional calculations. The phases include $\mathrm{Na}\mathrm{Al}{\mathrm{H}}_{4}$ (space group, $I{4}_{1}∕a$), ${\mathrm{Na}}_{3}\mathrm{Al}{\mathrm{H}}_{6}$ (space group, $P{2}_{1}∕n$), and NaH (space group…
We have assembled tin dioxide nanobelts with low-power microheaters for detecting dimethyl methylphosphonate (DMMP), a nerve agent simulant. The electrical conductance of a heated nanobelt increased for 5% upon exposure to 78 parts per billion DMMP in air. The nanobelt conductance recovered fully quickly after the DMM…
We report the preparation of arsenic doped p-type ZnO films using a Zn3As2∕ZnO target by pulsed laser deposition. Zn3As2 was used as a p-type dopant source material for arsenic doping in ZnO. The existence of As in the As-doped ZnO films was confirmed by the x-ray photoelectron spectroscopy study. The p-type behavior…
In the last decade, computational studies of liquid water have mostly concentrated on ground state properties. However recent spectroscopic measurements have been used to infer the structure of water, and the interpretation of optical and x-ray spectra requires accurate theoretical models of excited electronic states,…
The orientation-dependence of thin-crystal lattice fringes can be gracefully quantified using fringe-visibility maps, a direct-space analog of Kikuchi maps. As in navigation of reciprocal space with the aid of Kikuchi lines, fringe-visibility maps facilitate acquisition of 3D crystallographic information in lattice im…
A monophosphonate analogue of H4dota, 1,4,7,10-tetraazacyclododecane-4,7,10-tris(carboxymethyl)-1-methylphosphonic acid (H5do3aP), and its complexes with lanthanides were synthesized. Multinuclear NMR studies reveal that, in aqueous solution, lanthanide(III) complexes of the ligand exhibit structures analogous to thos…