Materials Literature
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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…
We report the structural refinement of large-unit-cell bcc crystalline phases found in Ti-Zr-Ni and Ti-Zr-Fe alloys, which are $1/1$ rational approximants of icosahedral quasicrystals in the same alloys. The structure of the stable $1/1$ phase $W(\mathrm{TiZrNi}),$ lattice constant ${a}_{o}=14.317\AA{},$ determined by…
The surface excitation parameter, which describes the influence of surface excitations by electrons for the vacuum side in electron spectroscopies, has been calculated for electrons of 200–2000 eV energies crossing surfaces of Cu, Ag, Au, Fe, Pd, Ni, MgO and SiO2. These calculations were performed for both incident an…
The heats of formation of BH, BH 2, BH 3, and B 2 H 6 have been obtained from ab initio coupled cluster calculations by using a systematic sequence of correlation consistent Gaussian basis sets. The best values were obtained by extrapolating the finite basis set results to the complete basis set limit and by incorpora…
The central part of the Mg-Al phase diagram was experimentally re-investigated. Between the {gamma} and {beta} phases only one additional intermediate phase could be verified. The other phases reported in literature may be explained by a commensurate modulation of the {gamma} phase ({gamma}`) found recently by electro…
Molecular dynamics simulation has been performed to investigate the microstructure and properties of low angle grain boundaries, employing the embedded atom method(EAM) type interatomic potential for Ni-Al alloy. The energies of the low angle grain boundaries with different dislocation densities were calculated, and t…