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 report the synthesis of sulfide nanostructures with trivalent molybdenum, i.e., crystalline Mo2S3 nanorods via a solid-gas reaction between porous Al2O3 impregnated with MoO3 and H2S gas. We show that the introduction of additional 8% H2 gas results in MoS2 nanotubes of the same size. A growth model is proposed for…
Mechanisms of N2 dissociative adsorption on small ruthenium clusters are studied by density functional calculations. The calculations indicate that the step of a ruthenium cluster has high activity for N2 activation, where an ensemble of five Ru atoms on the stepped surface of clusters is responsible for the active si…
Using an atomic force microscope (AFM) modified to perform piezo-AFM we have investigated the piezoelectric response of sol-gel thin film lead zirconate titanate (PZT 30/70, PbZr0.3Ti0.7O3) on Pt-Ti/SiO2/Si to a quasi-dc electric field. By applying a sinusoidal 2 Hz ac waveform between the AFM cantilever and ground we…
The results of extensive ab initio configuration interaction (CI) calculations of the spectrum of the [Ni2(napy)4Br2]+ complex are reported and analyzed. This complex can be seen as the simplest system exhibiting the so-called double-exchange phenomenon. This effect is usually rationalized in the minimal valence space…
The evolution of the second-harmonic signal is monitored as the poled sample is etched with hydrofluoric acid. The sample thickness is measured in real time using an interferometric method. The full set of data allows us to fully reconstruct the nonlinear spatial distribution created inside the glass, whatever the non…
Selective formation of ZnO nanodots was accomplished by metalorganic chemical vapor deposition on nanopatterned SiO2/Si substrates. Self-organized ZnO nanodots were selectively formed in nanopatterned lines of Si created by etching of SiO2 with focused ion beam (FIB), whereas any nanodots were hardly observed on the S…
We apply first-principles molecular dynamics and static calculations in the study of several layers of water adsorbed at an oxide surface. Our aim is to bridge the gap between the well-explored monolayer and the complex, little-understood oxide–water interface by probing this middle ground where there is still contact…
SiO 2 layers 180 nm thick are implanted with 120 keV Ge+ ions at a fluence of 1.2×1016 cm−2. The distribution and coarsening evolution of Ge nanoclusters are characterized by Rutherford backscattering spectrometry and transmission electron microscopy and the results are correlated with photoluminescence measurements a…
Abstract Dielectric measurements were obtained on poly(propylene glycol) (molecular weight: 4000 Da) at pressures in excess of 1.2 GPa. The segmental (α process) and normal‐mode (α′ process) relaxations exhibited different pressure sensitivities of their relaxation strengths, as well as their relaxation times. Such re…
Isostructural II-VI alloys whose components are either rocksalt stable (e.g., CaO-MgO) or zincblende stable (e.g., ZnS-ZnSe) are known to be thermodynamically unstable at low temperatures, showing a miscibility gap and no bulk ordering. In contrast, we show that heterostructural MgO-ZnO is stable, under certain condit…
Bright blue upconversion emission by thulium ions in PbGeO3–PbF2–CdF2 glass triply doped with Nd3+–Tm3+–Yb3+ under diode laser excitation around 800 nm is reported. The results revealed that the Nd3+/Tm3+/Yb3+-codoped sample generated ten times more 475 nm blue upconversion fluorescence than the Yb3+-sensitized Tm3+-d…
We construct a framework for the study of fluctuations in the nonequilibrium relaxation of glassy systems with and without quenched disorder. We study two types of two-time local correlators with the aim of characterizing the heterogeneous evolution in these systems: in one case we average the local correlators over h…
The fracture strength of ultrananocrystalline diamond (UNCD) has been investigated using tensile testing of freestanding submicron films. Specifically, the fracture strength of UNCD membranes, grown by microwave plasma chemical vapor deposition (MPCVD), was measured using the membrane deflection experiment developed b…
Star-shaped PbS crystals have been prepared by a novel thioglycolic acid (TGA) assisted hydrothermal method. X-ray diffraction reveals that the PbS crystals are well crystallized, with the cubic rock-salt structure. Transmission electron microscopy and scanning electron microscopy observations show that the PbS crysta…
Phase diagram and critical properties are studied for three-dimensional double-exchange model with and without quenched disorder. Employing the Monte Carlo method and the systematic analysis on the finite-size effect, we estimate the Curie temperature and the critical exponent as functions of the doping concentration…
Metalworking fluids (MWFs) increase productivity and the quality of manufacturing operations by cooling and lubricating during metal forming and cutting processes. Despite their widespread use, they pose significant health and environmental hazards throughout their life cycle. An obvious environmental improvement to M…
Reaction of yttrium and lanthanum trichloride with 1 equiv of sodium or potassium hydrotris(3,5-dimethylpyrazolyl)borate and 1 equiv of 2,2'-bipyridine gives good yields of the complexes [MCl(2)(Tp(Me2))(C(10)H(8)N(2))] (M = Y (1), La (2)). The analogous compounds with 1,10-phenanthroline, [MCl(2)(Tp(Me2))(C(12)H(8)N(…
The goal of this work was to develop an MRI method for mapping the clearance of interstitial macromolecular plasma proteins after their extravasation from permeable blood vessels. To that end, a well-defined window of exposure to elevated blood levels was generated by inducing rapid clearance of macromolecular contras…
The nanocrystalline Gd-doped lead titanium zirconate (PGZT) with the composition Pb0.92Gd0.08(Zr0.53Ti0.47)0.98O3 has been synthesized by a combination of high-energy ball milling [mechanical alloying (MA)] and sintering. PGZT prepared by MA followed by high-temperature sintering has a higher dielectric constant compa…
This article illustrates a method for the estimation of apparent trap-controlled mobility of charges (i.e., the mobility of charges trapped at different states due to chemical-physical features) in polymeric insulation, based on the results of space charge measurements. The information provided by the so-called depola…