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 activation energies for olefin epoxidation with Mimoun-type η2-peroxo complexes have been calculated using density functional methods. Six degrees of freedom of the complex [MOL(O2)(OER3)] and the olefin CH2CHR′ have been systematically modified. The calculations were based on the assumptions that the reaction fol…
Five new complex compounds of the formula Ln(phen)2(NO3)3 were prepared. The X-ray structural analyses indicate that they crystallize isostructurally in the monoclinic space group C2/c (no. 15) with cell dimensions for example for Pr(phen)2(NO3)3: a = 11.194(1) Å, b = 18.095(2) Å, c = 13.101(2) Å, β = 100.52(1)°, V =…
The formation of corrosion products during atmospheric corrosion on open and confined surfaces of electrogalvanized steel exposed to periodic wet/dry conditions was studied. The composition of the corrosion products was determined using Fourier transform infrared spectroscopy (FTIR) and extra information about the pha…
Low-k materials etching for FLARE™ and a porous silica were carried out in a magnetic neutral loop discharge plasma at low pressure, below 1 Pa. Fluorinated carbon molecules were used as etching gases for porous silica. The etch rate of the porous silica was approximately two times higher than that of thermal SiO2. Th…
Polarized optical absorption spectra of three synthetic Co-bearing silicates, orthopyroxene, olivine and beryl, were studied at room and liquid nitrogen temperatures. In all three matrices, Co enters octahedral structural sites as the Co 2+ ion. In accordance with the d 7 electronic energy level diagram, the spectra s…
Polyurethane-phosphates combination is known to form flame retardant (FR) intumescent system. But the intumescent formulation could not be permanent because of the water solubility of the phosphate. This problem could be solved by the technique of microencapsulation. Microcapsules of di-ammonium hydrogen phosphate (DA…
The covalent anchoring of metallo(chlorosulfonyl)phthalocyanines 1 onto the acrylic copolymers 2 and 3 has been achieved. When using H2O2 or KHSO5 as oxidant, these supported catalysts are able to oxidize a poorly biodegradable molecule such as 2,4,6-trichlorophenol or a tannin model such as 3,5-di-tert-butylcatechol.…
Poly(3-hydroxy alkanoate) containing unsaturated side chains was produced by feeding Pseudomonas oleovorans with soybean-oil acid (PHA-soybean). The composition of PHA-soybean were found to be 10 mol-% of unsaturated side chains with the saturated hexanoate, octanoate and decanoate units. Methyl methacrylate (MMA) was…
A molecular dynamics (MD) simulation was performed on a linear poly(ethylene) model under bulk amorphous conditions. A molecule was composed of united atoms (CH2 and CH3 unit), and the pressure of the MD cell was controlled to be 1 atm. The system was stepwise cooled from 600 to 120 K. At each temperature 2 ns simulat…
Good properties for magnetostriction and hysteresis losses are obtained in steel with 6.5% Si, making high-Si steels interesting in electrical applications. A research program is described to evaluate the possibility to produce high-silicon steel up to 6.5% Si using an appropriate hot rolling program followed by cold…
The rotational eigenvalues of isotopically substituted hydrogen molecules adsorbed into single-walled carbon nanotubes are calculated using a semiclassical method and using a model potential. The resulting eigenvalues are used to calculate the separation factors due to rotational confinement between different isotopic…
Problems with scaling of conductive-system experimental Mdat″(ω) and σdat′(ω) data are considered and resolved by dispersive-relaxation-model fitting and comparison. Scaling is attempted for both synthetic and experimental M″(ω) data sets. A crucial element in all experimental frequency-response data is the influence…
Ceria (CeO2) is an oxygen storage material vital to the proper functioning of automobile three-way catalysts and is typically viewed as an anion conductor. Prior experimental work using temperature programmed static secondary ion mass spectrometry (TPSSIMS) has indicated that for rutile TiO2, a prototypical oxide, the…
Photochromic liquid crystalline main chain poly(ester imide)s with cinnamoyl moieties and chiral groups as part of the backbone were characterized concerning their liquid crystalline, molecular dynamical, and photochemical properties. Homo- and copolymers were synthesized by polycondensation of mixtures containing iso…
Nanostructured CdFe2O4 spinel powders with various grain sizes ranging from 60 to 4 nm were synthesized by ball milling the bulk material. The magnetization measurements at 1 and 9 T reveal a spin-glass-like surface structure and the material is found to have a large anisotropy. Mössbauer studies at 10 K in external m…
The results of a comprehensive study by the methods of IR absorption, Raman scattering, photoluminescence (PL), and electron spin resonance (ESR) of SiO x films prepared by thermal evaporation of SiO in a vacuum are presented. The nature of structural transformations occurring on annealing the films is determined. Ann…
Abstract The current options for solid‐state consolidation processing of powder‐based advanced aluminum alloys have been very limited and complicated, resulting in a segregation of the applications primarily to the aerospace segment. Throughout any consolidation sequence for aluminum powders, the oxide and/or hydroxid…
The molecular level premelting process of purified biosynthesized polyester poly(hydroxybutyrate-co-hydroxyvalerate) or P(HB-co-HV) (20.4% HV) was investigated by two-dimensional Fourier transform infrared (2D FT-IR) correlation spectroscopy. Intensity variations and band shifts in the characteristic spectral regions…
DAB-Am64-(1B4M-Gd)(64) is a newly synthesized macromolecular liver magnetic resonance imaging (MRI) contrast agent with a polypropylenimine diaminobutane (DAB) dendrimer conjugated with a bifunctional diethylenetriaminepentaacetic acid (DTPA) derivative for complexing Gd(III) atoms. The characteristics of DAB-Am64-(1B…
Corrosion rates for sintered NdFeB magnets are compared with NdFeB magnets prepared from melt spun material (hot pressed and die upset). Corrosion rates were determined by standard electrochemical methods in 0.9 M Na/sub 2/SO/sub 4/, at pH 2.4 and 4.4. Autoclave tests correlated quite well with corrosion rates measure…