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。
Luminescence from the oxygen-to-metal (O → M) ligand-to-metal charge-transfer (l.m.c.t.) triplet states for polyoxometalates of tungsten and molybdenum was observed below 100 K. The Stokes shift was large and the time profile of the emission decay approximated two exponential decays at all temperatures. The emission y…
Different alkenes are epoxidized with high selectivity in the presence of manganese(III) tetraphenylporphyrin–imidazole–sodium periodate–tetrabutylammonium bromide system in CH2Cl2–H2O media, with high yields (80–100%) at room temperature.
The thermal decomposition of 3,5-dihydroxybenzoyl azide, to generate in situ the corresponding AB2-type dihydroxy isocyanate monomer, was found to give hyperbranched polyurethanes, whose structures were established using IR and NMR spectroscopy.
We present the results of our investigations on the electrooptic properties of the smectic O and O* phases of m7tac (1-methylheptyl terephthalylidene-bis-4-aminocinnamate). At low voltages, we observed striking electrochromic effects and, in O* at high voltages, a field induced phase transition. Freely suspended thick…
Polyaniline serves as a synthetic metal catalyst with reversible redox under oxygen to induce dehydrogenative and/or decarboxylative oxidation of benzylamines and 2-phenylglycine into the corresponding imines and, in combination with copper(II) chloride or iron(III) chloride, dehydrogenation of cinnamyl alcohol into c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDye diffusion in isotropic and liquid-crystalline aqueous (hydroxypropyl)celluloseMazidah B. Mustafa, Debbie L. Tipton, Mary D. Barkley, Paul S. Russo, and Frank D. BlumCite this: Macromolecules 1993, 26, 2, 370–378Publication Date (Print):January 1, 1993Publication History…
A novel degradative procedure for the determination of the degree of branching in hyperbranched macromolecules is presented, and its versatility and scope are demonstrated with the synthesis and characterization of hyperbranched polyesters based on 4,4-bis(4′-hydroxyphenyl)pentanoic acid.
This paper is concerned with a system of nonlinear partial differential equations, in short, the coupled Cahn-Hilliard equations, which consists of a fourth order quasilinear parabolic equation and a second order quasilinear parabolic equation. This system was recently derived by Penrose and Fife and also by Alt and P…
Analyses on the effects of polymeric N-acetyl-D-glucosamine (chitin), which was obtained from squid pen, on histiogenic activation in dogs were carried out with subcutaneous implants (5 x 5 cm2) of polyester non-woven fabric (NWF) supplemented with chitin (chitin group) and NWF (control group). These materials were im…
From our research for novel non-linear optical (NLO) materials for frequency doublers and optical modulators we report on new ferroelectric liquid crystals, which for the first time, exhibit second order NLO coefficients (for example d 22 = 5 pm V−1, which are comparable to those of state of the art inorganic NLO mate…
Enzymatic ring-opening copolymerization of lactones was carried out by using Pseudomonas fluorescens lipase in bulk. In the copolymerizaton of ε-caprolactone (ε-CL) and δ-valerolactone at 60°C for 10 days a copolymer with molecular weight of 3.7×103 was obtained and its structure was found to be of random structure ha…
Cellulosic materials have long been used as cost-cutting fillers in the plastic industry. Among the various factors which determine the final performance of the composite materials depend, to a large extent, on the adhesion between the polymer matrix and the reinforcements, and, therefore, on the quality of the interf…
The microstructure development of a ceramic composite material fabricated by active‐filler‐controlled polymer pyrolysis (AFCOP) was investigated. During heating of a polysiloxane precursor mixed with titanium powder in argon atmosphere up to 1400°C, thermally induced decomposition of the polymer phase is combined with…
T. Okada, Analyst, 1993, 118, 959 DOI: 10.1039/AN9931800959
Description 31 papers cover three wide-ranging topics: • unique small and miniature specimens, as well as nondestructive, nonintrusive, and in-situ test techniques for measuring mechanicals and fracture properties • application of those techniques to assess irradiation-induced embrittlement • and actual examples of th…
Ultrafine powders of TiO2 have been prepared by combined hydrothermal H2O2 oxidation. H2O2 oxidation and gel formation were performed at room temperature. Hydrothermal treatment was carried out at 140 °C. Anatase powder was formed in distilled water and rutile powder was formed in 1.0 mol dm–3 nitric acid solution. DT…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Cu-CuTCNQ-M devices using scanning electron microscopy and scanning tunneling microscopyJ. J. Hoagland, X. D. Wang, and K. W. HippsCite this: Chem. Mater. 1993, 5, 1, 54–60Publication Date (Print):January 1, 1993Publication History Published online1 May 2…
The dinucleating macrocycles H2Lm,n containing two 2,6-di(aminomethyl)-4-methylphenol entities combined through two alkane chains, (CH2)m and (CH2)n, at the amine nitrogens have been prepared for the (m,n) sets (2,3), (2,4), (2,5), (3,3) and (3,4). The dinuclear copper(II) complexes having general formula [Cu2Lm,n][Cl…
Amorphous phases have been prepared by melt spinning technique from the oxide samples having compositions 41.3 mol%SrO-41.3 mol%Fe2O3-17.4 mol%B2O3 (composition S) and 63.1 mol%SrO-19.4 mol%Fe2O3-17.5 mol%B2O3 (composition T). When these amorphous phases are heat-treated by heat treatment, SrO·6Fe2O3 crystal particles…
Isocitrate dehydrogenase (IDH) of Escherichia coli is regulated by phosphorylation and dephosphorylation. This phosphorylation cycle controls the flow of isocitrate through the glyoxylate bypass, a pathway which bypasses the CO2 evolving steps of the Krebs' cycle. IDH is phosphorylated at a single serine which resides…