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 electrical conductivity, magnetic susceptibility, magnetization, and submillimeter (v=5∓20 cm−1) permittivity and dynamic conductivity of La1−x Sr x MnO3 (0≤x≤ 0.45) single crystals are investigated. The anomalies in the temperature dependences of these quantities are identified with diverse magnetic and structura…
This book surveys recent theoretical and experimental studies of optical properties of low-dimensional materials. As an extended version of Optical Properties of Low-Dimensional Materials (Volume 1, published in 1995 by World Scientific), Volume 2 covers a wide range of interesting low-dimensional materials including…
A microphase separation transition (MST) of a thermoplastic elastomer based on soft segments of poly(tetra methylene oxide) and hard crystalline segments of poly(tetra methylene terephthalate) has been studied by means of rheological measurements, differential scanning calorimetry (DSC), and wide-angle X-ray scatterin…
Oxidation of [Rh 2 (O 2 CEt) 4 (PR 3 ) 2 ] (R: cy = cyclohexyl and Pr i = iso-propyl) with ferrocenium ion gave stable salts of their cationic radicals. Their X-ray structures showed ca. 0.048 Å longer Rh−Rh and ca. 0.12 Å shorter Rh−P bonds than those of the diamagnetic neutral complexes. The pyramids of the phosphin…
Abstract Adsorption-desorption of Cd to Ca montmorillonite (SAz-1) was studied at concentrations ranging from 44.5 to 266.8 μ M . An adsorption model was employed in the analysis of the data. The procedure consists of solving the electrostatic Gouy-Chapman equations and calculating adsorbed amounts of the cations as t…
Shape- or size-selective micro- and mesoporous solids find applications as catalysts, catalyst supports, and membrane materials. Here the synthesis of a high surface area microporous base is reported. This material, prepared by ammonolysis of oligomeric methylsilazanes, is a nitride analogue of amorphous silica-based…
A new optically active (>99% ee) organosilicon compound, 1-(1-naphthyl)-1-phenyl-1-vinyl-3,3-dimethyl-3-hydro-1,3-disiloxane was prepared. This bifunctional disiloxane was used as the monomer to synthesize optically active and isotactic poly[{(1 S )-1-(1-naphthyl)-1-phenyl-3,3-dimethyldisiloxane-1,3-diyl}ethylene] via…
A tetrafunctional epoxy monomer, N,N,N′-N′-tetraglycidyl-4,4′-diaminodiphenyl methane (TGDDM), has demonstrated to be a highly efficient reactive compatibilizer in compatibilizing the immiscible and incompatible polymer blends of polyamide-6 (PA6) and poly(2,6-dimethyl-1,4-phenylene ether) (PPE). This epoxy coupler ca…
Molecular beam epitaxy of SrTiO 3 thin films on a Si(100)-2×1 surface has been studied using reflection high-energy electron diffraction (RHEED), an atomic force microscope (AFM) and X-ray diffraction (XRD) as a function of the thickness of the SrO buffer layer and growth temperature. Epitaxial SrTiO 3 films do not gr…
Composites of polyaniline and were prepared by casting on a Ni electrode substrate an N ‐methylpyrrolidinone solution containing dissolved polyaniline in its reduced state and dispersed crystalline powder. Charge‐discharge tests of the as‐prepared composites showed that redox reactions of both polyaniline and particle…
Abstract N-Isopropylcholamide afforded three kinds of matters in organic solvents; organogels, inclusion crystals, and guest-free crystals. The gelation occurred in aromatic liquids in the presence of methanol as a good solvent, while the inclusion crystals were formed when adding ethanol, 1-propanol, or acetone as a…
A facile and rapid method for the production of protein C-terminal thiocarboxylates on DNA-encoded polypeptides is described. This method, which relies on the mechanism of the cleavage reaction of intein-containing fusion proteins, can produce multi-milligram quantities of protein C-terminal thiocarboxylate quickly an…
In this paper, we report careful transport and magnetic measurements on single crystals of deuterated $\ensuremath{\kappa}\ensuremath{-}{(\mathrm{ET})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2})]\mathrm{Br}.$ By cooling the sample at different rates, it is found that cooling through 80 K has a dramatic effect on th…
The bremsstrahlung spectra of electrons interacting with neutral rare gas atoms are calculated for temperatures from 5000 to 40 000 K. The calculations were previously shown to be in agreement with measurements of such spectra recorded under a variety of conditions. The computational results are compared with measured…
A molecular-dynamics simulation is performed for a supercooled liquid of rigid diatomic molecules. The time-dependent self and collective density correlators of the molecular centers of mass are determined and compared with the predictions of the ideal mode coupling theory (MCT) for simple liquids. This is done in rea…
The oxidation behaviors of monolithic Si 3 N 4 and nanocomposite Si 3 N 4 ‐SiC with Yb 2 O 3 as a sintering aid were investigated. The specimens were exposed to air at temperatures between 1200° and 1500°C for up to 200 h. Parabolic weight gains with respect to exposure time were observed for both specimens. The oxida…
A surface anchoring transition of a nematic at polymer surfaces created by polymerization-induced phase separation is presented. This transition is unusual in that it occurs far from bulk nematic phase transitions and it is tunable across nearly the entire nematic temperature range by modification of the polymer side…
${\mathrm{La}}_{1.35}{\mathrm{Sr}}_{1.65}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ is investigated in the regime where 3D magnetic order is lost but 2D correlations are strong. ESR shows that the localized ${t}_{2g}$ spins are coupled into intralayer ferromagnetic clusters of fixed size. The ${e}_{g}$ carriers form polarons…
In situ ultraviolet–visible spectroscopy has been used to study diffusion of two azo-dyes in a CO2-swollen matrix of poly(methyl methacrylate) (PMMA). The diffusivity of both dyes can be tuned simply be changing the system pressure. Higher pressure of CO2 enhances diffusion of a dye in PMMA. The diffusion of dyes in C…
The magnetization of a novel supramolecular grid structure consisting of four bis(bipyridyl)-pyrimidine ligands and four ${\mathrm{Ni}}^{2+}$ ions and that of the mononuclear analogue ${\mathrm{Ni}(\mathrm{terpy})}_{2}$ was measured. Magnetic anisotropy was determined from investigations of powder as well as of crysta…