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。
Through the combination of three different, complementary techniques (optical microscopy, x-ray diffraction and atomic force microscopy), we reveal the deformations inside thin smectic films frustrated between two interfaces imposing antagonistic anchorings. We study the model system, 4-n-octyl-4'-cyanobiphenyl (8CB)…
A series of alkyl-substituted polythieno[3,2- b ]thiophenes were synthesized by cross-coupling and oxidative coupling reactions. Their electronic properties were studied by UV−vis absorption and fluorescence spectroscopies. The poly(3-nonylthieno[3,2- b ]thiophene) prepared via Stille coupling of a differentially func…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Selenium Nanoparticle and Its Photocatalytic Application for Decolorization of Methylene Blue under UV IrradiationSudip Nath, Sujit Kumar Ghosh, Sudipa Panigahi, Thomas Thundat, and Tarasankar PalView Author Information Department of Chemistry, Indian Institute of…
Zn 1- x Cd x O films were successfully grown by remote plasma-enhanced metalorganic chemical vapor deposition (RPE-MOCVD). The content ratio of Zn 1- x Cd x O films was controlled by changing the molar ratio of diethyl zinc (DEZn) to dimethyl cadmium (DMCd). The wurtzite structure of Zn 1- x Cd x O films was obtained…
We present a theoretical study of the electronic and mechanical properties of graphyne-based nanotubes (GNTs). These semiconducting nanotubes result from the elongation of one-third of the covalent interconnections of graphite-based nanotubes by the introduction of yne groups. The effect of charge injection on the dim…
Abstract A new photosynthetic reaction center mimic consisting of a porphyrin (P) linked to both a fullerene electron acceptor (C 60 ) and a carotenoid secondary electron donor (C) was synthesized and studied in 2‐methyltetrahydrofuran using transient spectroscopic methods. Excitation of the porphyrin is followed by p…
Polyamorphic transformations of silicon have been investigated by constant-pressure first-principles molecular-dynamics simulations. By pressurizing a normal amorphous Si with tetrahedral coordination, a new high density amorphous (HDA) form that has a strong resemblance to HDA water is obtained. We find that the HDA…
Magnetic tunnel junctions with a magnetically soft Heusler-alloy electrode $({\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Si}∕\mathrm{Al}+\text{oxidation}+\mathit{\text{in}}\phantom{\rule{0.3em}{0ex}}\mathit{\text{situ}}\phantom{\rule{0.5em}{0ex}}\text{annealing}∕{\mathrm{Co}}_{7}{\mathrm{Fe}}_{3}∕{\mathrm{Mn}}_{83}{\mathrm{Ir…
Nanocrystalline metals with grain diameter less than 30 nanometers may exhibit a range of new and interesting deformation mechanisms. In his Perspective, Ma discusses the results reported in the same issue by Shan et al., who recorded motion of the nanograins during deformation of nickel samples using an in situ trans…
The fluorescence of colloidal CdSe/ZnS nanocrystals at room temperature exhibits a perfect antibunching under continuous or pulsed excitation. In this paper, we discuss the consequences of fluorescence properties of CdSe nanocrystals on the generation of single photons. In particular, we examine the role of Auger proc…
OBJECTIVE: To study autologous tissue engineered blood vessels (TEBV) in the descending aorta of juvenile sheep. METHODS: Autologous vascular smooth muscle cells (vSMC) and endothelial cells were obtained from ovine carotid arteries. vSMC were seeded on bioresorbable scaffolds and dynamically cultured for 14 days. Fol…
Abstract Polyimide/silica (PI/SiO 2 ) hybrid nanocomposites were prepared by the sol‐gel process directly from a soluble polyimide. This soluble PI was synthesized from a diamine with a pendant phenyl hydroxyl group, 4,4′‐diamino‐4″‐hydroxy triphenyl methane (DHTM) and a dianhydride, pyromellitic dianhydride (PMDA), f…
The dependence of the surface properties of thin rutile $\mathrm{Ti}{\mathrm{O}}_{2}(110)$ films on the number of layers in two-dimensional slab models has been investigated with first-principles methods based on density-functional theory. A pronounced oscillation of the interlayer distances, surface and adhesion ener…
The field lines of Poynting vector around a small particle are investigated on the basis of classical Mie theory. A particle can effectively absorb incident energy near the optical resonance, where its optical absorption cross-section becomes much greater than its geometrical cross-section. It is shown that absorbed e…
The combination of bandstructure theory in the local density approximation with dynamical mean field theory was recently successfully applied to V$_2$O$_3$ -- a material which undergoes the f amous Mott-Hubbard metal-insulator transition upon Cr doping. The aim of this sh ort paper is to emphasize two aspects of our r…
We discuss different methods of calculation of the screened Coulomb interaction $U$ in transition metals and compare the constraint local-density approximation (LDA) with the GW approach. We clarify that they offer complementary methods of treating the screening and should serve for different purposes. In the GW metho…
Experimental observations of a peculiar behavior observed on heating and cooling ${\rm Sb_2Te_3}$ films at different heating and cooling rate are detailed. The film regained its original resistance, forming a closed loop, on the completion of the heating-cooling cycle which was reproducible for identical conditions of…
The tunneling magnetoresistance (TMR) of a hexagonal array of dipolar coupled anisotropic magnetic nanoparticles is studied using a resistor network model and a realistic micromagnetic configuration obtained by Monte Carlo simulations. Analysis of the field-dependent TMR and the corresponding magnetization curve shows…
We report a first-principles study of vacancy-induced self-diffusion in crystalline silicon. Starting form a fully relaxed configuration with a neutral vacancy, we proceed to search for local diffusion paths. The diffusion of the vacancy proceeds by hops to first nearest neighbor with an energy barrier of 0.40 eV in a…
The random first-order transition theory of the dynamics of supercooled liquids is extended to treat aging phenomena in nonequilibrium structural glasses. A reformulation of the idea of "entropic droplets" in terms of libraries of local energy landscapes is introduced which treats in a uniform way the supercooled liqu…