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。
Titanium oxo based xerogels obtained through hydrolysis of titanium tetrabutoxide in acidic conditions have been characterised through FTIR,17O MAS and 1H–17O static CP NMR experiments. This latter technique allows the separation of the 17O NMR resonances corresponding to the protonated titanium oxo sites from those o…
The synthesis and crystal structure of a new 14-membered ring gallium oxyfluorophosphate are described: DIPYR-GaPO: Ga7P6O28F3C10N2H16 , Mr=1343.1, space group P , a=12.000(3) Å, b=13.895(4) Å, c=10.280(4) Å, alpha;=101.09(3)°, beta;=100.91(2)°, gamma;=106.41(2)°, Dc=2.83 g cm–3 , F(000)=1297, R=2.89%, Rw=3.63%. The p…
A unique hexagonal system based on an organic π-donor has been tailored by the strong and directional I···N intermolecular interaction, and its highly symmetrical structure including two types of channels and high conductivity are reported.
The stability of oxygen anions and the hydrogen abstraction from methane on a reduced SnO2 (110) crystal surface have been studied theoretically using a point-charge model. The geometric and electronic structures for the present molecules are calculated by means of a hybrid Hartree–Fock/density functional method at th…
A study of lithium insertion in two tetragonal tungsten bronze (TTB) type phases of general formula M 8 W 9 O 47 (M=Nb and Ta), is presented. The electrochemical insertion of up to 20 lithium atoms per formula unit in Nb 8 W 9 O 47 (Li/ΣM=1.2) proceeds through a reversible reaction with several single phase and one tw…
Abstract A detailed low‐energy electron diffraction (LEED)‐IV analysis, complemented by scanning tunneling microscopy (STM) observations, was carried out for the apparent (2 × 2) structure of the oxygen‐covered Ru(001) surface at a coverage of 0.75 ML. We present STM images of incomplete layers which allow one to defi…
Acetobacter xylinum produces cellulose in the form of a twisted thin ribbon assembly. Handedness of the twisted ribbon assembly was examined by transmission electron microscopy (TEM). Special care for correct up-and-down setting of specimens and photographic films was taken to determine the handedness of the twisted a…
For the rotor ring of the hysteresis motor, semihard Alnico magnets have been almost applied until now. However, the hysteresis motor using Alnico magnets has several disadvantages. In order to improve the disadvantages of conventional hysteresis motors, the Fe-Cr-Co magnet steel with magnetic anisotropy is applied fo…
Constant extension rate tensile (CERT) specimens were irradiated in the core of a commercial operating boiling-water reactor (BWR). Subsequent to irradiation, CERT testing was performed in a test loop attached to the reactor water cleanup system in the same BWR, using reactor water at a high flow rate. Testing was per…
The reaction of MI2·xMe3CN (M = Mn, Fe) and TCNE (tetracyanoethylene) leads to unprecedented [C4(CN)8]2– µ4-metal complexes which have been crystallographically characterized and are precursors to M(TCNE)x·yS magnets.
The corrosion behavior of three Ni-Ti alloys with compositions as commercial super-elastic orthodontic wires was investigated using polished plate specimens. Corrosion resistance was estimated by potentiodynamic polarization measurement in 0.9% NaCl and 1% lactic acid solutions and analysis of released metals by atomi…
EPR and kinetic absorption spectroscopy experiments reveal the simultaneous formation of transient radicals and a persistent reduced tungsten radical species during the photoreaction of W10O324– with organic substrates in solution. It is shown that a special kinetic effect operates which causes the observed selective…
The wetting properties of untreated, water-extracted and chromated copper arsenate (CCA)-treated red maple were characterized by contact angle measurements. Conventional experimental and mathematical modeling were employed to evaluate the wetting parameters. Zisman's critical surface tensions, and both acid-base (γABs…
We review some recent developments of high-order response theory and illustrate the utility of this theory for a selection of nonlinear properties. © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 219–239, 1998
The solubility of 3-nitro-1,2,4-triazol-5-one in water was measured over the temperature range from 284.65 K to 367.55 K. The results were correlated by an exponential equation. Densities of the aqueous solutions have been measured at temperatures from 308.15 K to 368.15 K and at mole fractions of 0.0027 to 0.014. The…
New fluorosensors based on azobenzene derivatives have been synthesised, characterised and their photophysical properties investigated. Compounds 2a and 2b undergo E→Z photoisomerisation on irradiation at ≈330 nm accompanied by fluorescence enhancement. Z→E isomerisation in the dark is accompanied by a decrease in the…
The effect of two different thermal/chemical pretreatments on a high surface area zirconia sample has been studied using FTIR spectroscopy. As revealed by high resolution electron microscopy (HREM), the sample exhibits a significant concentration of small pores and cavities with size ranging from 1 to 2 nm. When pretr…
Symmetrical dialkyl trithiocarbonates were readily snythesized in excellent yields from alkyl halides and carbon disulfide under mild reaction condition in the presence of a regenerable hydroxide form of an anion exchange resin.
The manganese(III) complex of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin covalently bound to crosslinked chloromethylated polystyrene can act as an efficient heterogeneous catalyst for alkene epoxidation by sodium periodate.
Heat transfer experiments with a saturated CaS04 solution were carried out in a closed-loop test rig containing an externally heated test section. Reproducible fouling curves were measured for the solution without fibers. The buildup of deposit was asymptotic, which implied that the fouling process was a combination o…