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 crystal structure of the title compound was determined at 250 K in space group I 4 bar 2m, a = 20.661(5) Å , c = 6.764(7) Å , Z = 8. The individual dithiadiazole rings form two sets of contrarotatory 4-member pinwheels clustered around a 4-fold rotation-inversion axis located halfway along the unit cell edges, des…
This paper presents an experimental study on the manufacture of low-density fine-cell high density polyethylene (HDPE) foams in extrusion using CO 2 as a blowing agent. The strategies adopted to produce low-density, fine-cell HDPE foams were to generate a large number of cells by a rapid pressure drop, to suppress cel…
Rate coefficients for the depletion of ground-state nitrogen atoms by O 2 have been measured using a high-temperature photochemistry reactor. The N atoms were generated by VUV flash photolysis of N 2 O, and the relative concentrations were monitored by resonance fluorescence. The data are best fitted by the expression…
This paper deals with analysis by FEM for iron losses considering vector magnetic properties. We define the tensor magnetic reluctivity and calculate it from the data measured with two-dimensional measurement method. This numerical method is applied to the direct magnetic loss analysis. As a result, it is shown that t…
Abstract Oxalate is one of the dominant low molecular weight organic anions in many soils under forest ecosystems. Through its complexation reactions with Fe and Al, both in solution and at mineral surfaces, oxalate increases the availability of nutrients such as P in these soils. This investigation was designed to st…
Three new perylene-3,4-dicarboximide chromophores5a–c have been synthesized. They are characterized by high extinction coefficients and excellent thermal and photochemical stability. They display liquid crystallinity and exhibit several discotic phases depending upon temperature and substitution pattern.
The gas-phase reactions of molybdenum oxide cluster ions Mo x O y + ( x = 1−3, y = 1−9) with small alcohols have been investigated using Fourier transform ion cyclotron resonance mass spectrometry. The product branch ratios are reported. The reactions of Mo x O y + with alcohols can be envisioned as proceeding via met…
The non-hydrolytic sol–gel route has been used in the solvent-free synthesis of binary inorganic oxides based on silicon, aluminium and titanium. Where necessary, iron(iii) chloride was used as a catalyst. Clear evidence for the formation of true, amorphous binary systems was obtained only in the case of aluminosilica…
The ab initio determination of relatively complex crystal structures of flexible molecules without the need for single crystals is discussed. A method is described based on simulated annealing in which the powder diffraction patterns of randomly generated trial structures are calculated and compared with the observed…
Time-resolved in situ Raman spectroscopy was used to follow the decomposition of supported crystalline BaO 2 into defect-rich BaO. This decomposition occurred under O 2 partial pressures which were small compared to those expected from a calculated phase diagram. However, the O 2 partial pressures at which this BaO 2…
Different crystal forms of ibuprofen (IBF) were prepared using methods such as cooling hot solution of the drug and precipitation of crystals from the drug solution. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), melting point, x-ray powder diffractometry, infrared absorption spectroscopy…
The europium(II)-doped aluminates, SrAl2O4 and CaAl2O4with β-tridymite structure and BaMgAl10O17 with β-Al2O4 structure, have been investigated by means of EPR spectroscopy. From the complicated X-band EPR spectra observed for SrAl2O4:Eu,Dy and CaAl2O4:Eu,Nd it is deduced that they have large zero-field splittings in…
A rhenium(I) complex with boronic acid pendant is synthesized and characterized; the complex is shown to exhibit pH dependent electronic absorption characteristics; the photophysical properties and sugar sensing behaviour are also investigated.
We report measurements of the absolute differential cross sections for charge transfer scattering of 0.5-, 0.85-, 1.5-, 2.8-, and 5-keV ${\mathrm{O}}^{+}$ by ${\mathrm{N}}_{2}$ at scattering angles between 0.04\ifmmode^\circ\else\textdegree\fi{} and 3.1\ifmmode^\circ\else\textdegree\fi{} in the laboratory frame. Cross…
Simple dissolution of 3:1 mixtures of aromatic carboxylic acids with suitable solubilising groups and tris(4,5- dihydroimidazol-2-yl)benzene 6 gave branched hydrogen-bonded assemblies 7 that were soluble in chlorinated and aromatic solvents.
We report the synthesis, crystal structure, physical properties and hydrolysis kinetics of [(O)(tmpa)V(IV)(&mgr;-O)V(V)(tmpa)(O)](3+) (tmpa = tris(2-pyridylmethyl)amine), the first cation in its class for which both solid state and solution-phase characteristics are fully consistent with expectations for a Robin-Day t…
Complexation of a bipyridine-based nitronyl nitroxide biradical with nickel(II) affords two complexes that differ by the nature of one axial ligand and by their magnetic behaviour: in both cases ferromagnetic interactions between high-spin nickel(II) and the radicals are observed.
The synthesis and mesomorphic properties of a homologous series ofN-(2-hydroxy-4-n-alkoxybenzylidene)-3′,4′-di-n-alkoxylanilines and their copper(ii) complexes bis[(N-3′,4′-dialkoxyphenyl)-4-n-alkoxylsalicylaldiminato]copper(ii) are reported. The disc-like copper complexes exhibited columnar hexagonal disordered mesop…
A wide variety of extracted and synthesised drug molecules have electron transfer capabilities which allow them to generate reactive oxygen species (ROS). In particular, many antibiotics that kill or inhibit bacteria, yeasts and cancer cells readily transfer electrons to oxygen making superoxide and hydrogen peroxide…
Simulation of surfaces and grain boundaries of α-alumina were carried out by the molecular dynamics method using an ionic pair potential. Simulation of five different surfaces, (1101), (1104), (1102), (1120), (0001), showed that, although a distorted structure formed at the surface, the calculated surface energies (γs…