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。
From the variation of magnetic properties with temperature trans-bis[1,2-bis(diethylphosphino)ethane]-di-iodochromium(II) undergoes a sharp S= 2 to S= 1 spin-state transition between 165 and 175 K.
The rate of alkene epoxidation promoted by 30% H2O2 and catalysed by MnIII tetra (2,6-dichlorophenyl)porphyrin is strongly enhanced by the addition of lipophilic carboxylic acids and lipophilic imidazole or pyridine axial ligands, in 1–8 : 1 and 1 : 1 molar ratios with respect to the porphyrin.
—The influence of the roughness of solid surfaces on the contact angle hysteresis, Δ, was studied for low-energy solids (paraffin, PTFE, PMMA) using pure liquids. Taking Δ as dependent on the roughness, the contact angle data can be linearly approximated. The value of Δ = 0 is considered as the equilibrium contact ang…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidative co-oligomerization of guaiacol and 4-chloroanilineKathleen E. Simmons, Robert D. Minard, and Jean Marc BollagCite this: Environ. Sci. Technol. 1989, 23, 1, 115–121Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissu…
Three kinds of corrosion tests, a humidity test (80 degrees C, 90% RH), an autoclave test (120 degrees C, 2 atm saturated with water vapor), and a salt spray test (35 degrees C, 5% NaCl), were performed on a sintered magnet treated with nickel plating. For comparison, samples with epoxy resin coating, Al ion plating,…
Abstract Cationic starches are widely used as wet end additives in paper making. They provide many benefits, classified into 4 categories: improvement of mechanical strength; better retention of fines and fillers; faster drainage; reduction of waste water pollution. According to the accepted theory, a 2‐part electrica…
Polymer films containing droplets of nematic liquid crystal form an important class of new electro-optic light valves and displays. While previous work has shown that the nematic droplet size is an important factor in the electro-optic properties of these films, here we report that the droplet shape is equally importa…
Performed measurements showed that in Na0.5Bi0.5TiO3 single crystals the long-time variation of the electric permittivity is connected with the existence of polar regions. The size and dynamics of the polar regions change with temperature. These regions may be ordered in an external electric field.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR investigation of local dynamics in bulk polymers at temperatures well above the glass-transition temperature. 3. cis-1,4-Polybutadiene and cis-1,4-polyisopreneR. Dejean de la Batie, F. Laupretre, and L. MonnerieCite this: Macromolecules 1989, 22, 1, 122–129Publ…
A supported Mn–porphyrin catalyst was prepared by strong adsorption of the tetracationic Mn[meso-tetra(4-N-methylpyridiniumyl) porphyrin](Cl)4+4Cl– on silica, and was found very efficient for cyclo-octene epoxidation (95% yield, 13 turnovers per min) and for alkane hydroxylation, with alcohol yields and alcohol: keton…
The structure of media whose short-range order cannot be extended crystallographically in flat space (disordered metallic and covalent systems, Frank-Kasper phases, quasicrystals, blue phases and various molecular phases) is describable in terms of distributions of defects in a crystal situated in a space of constant…
Long-wavelength magnetic excitations are investigated in the quasiperiodic layered structures consisting of alternating magnetic and nonmagnetic layers, distributed according to the recently introduced generalized Fibonacci sequences. Both periodic and real boundary conditions are used. Spin-wave spectra for Fibonacci…
A cyclic trinuclear porphyrin host has been synthesised; its binding properties show that it has a spacious cavity which prefers an open conformation but which can close around small bidentate ligands such as 4,4′-bipyridyl.
Extending a design concept for liquid-crystalline compounds with large lateral substituents, we have synthesized several new variants of twin compounds: lateral-terminal flexible bound, and lateral-lateral flexible bound with and without ring systems in the flexible spacer. X-ray investigations of the nematic phases o…
Experimental data on the electrical conductivity of conducting polymers is reviewed. Polyacetylene is regarded as a prototype and the conductivity is studied as a function of doping level, temperature, frequency and conjugation length. The consistency of the data with a model of anisotropic variable range hopping is p…
This brief history and review of liquid crystalline polyesters (LCPs) is limited to all-aromatic LCPs except for a description of the discovery of the first thermotropic polymer to be injection molded or melt spun and characterized as being liquid crystalline: an Eastman PET/PHB (p-hydroxybenzoic acid) copolyester (fi…
Microcapsules were prepared using a poly (L-lactic acid) (L = PLA), mol. wt. 43,200, by an emulsification and solvent evaporation technique. Phenobarbitone (PB) was used as a reference drug, (core to polymer ratio, 1:1). Both the o/w and w/o emulsion system were investigated in order to study microcapsule properties a…
Oxidative electropolymerization of cobalt and nickel complexes of tetra-aminophthalocyanine in dimethyl sulphoxide rapidly leads to electrode modification, and the thin polymeric coatings obtained by this method are highly electronically conductive under a wide variety of conditions.
"Encyclopedia of materials science and engineering." International Materials Reviews, 34(1), p. 246
Article The Hot Pressing of Dry-formed Wood-based Composites. Part II. A Simulation Model for Heat and Moisture Transfer, and Typical Results was published on January 1, 1989 in the journal Holzforschung (volume 43, issue 3).