Materials Literature
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The compound Bi 1/2 Ag 1/2 TiO 3 has been synthesized, for the first time, at 14−14.5 GPa and 1000 °C using the uniaxial split sphere anvil type press (USSA-2000). The structure of the quenched powder sample was refined from synchrotron X-ray diffraction data using the Rietveld method. At room temperature, Bi 1/2 Ag 1…
The NH protons of the chlorins (17,18-dihydroporphyrins) and fully conjugated porphyrins can undergo tautomerization between the four central nitrogens. We have investigated the NH tautomerization process of bonellin dimethyl ester by NMR spectroscopy and molecular modeling. In this natural chlorin derivative, the tau…
Sulfur K-edge X-ray absorption spectroscopy (XAS) has been used to investigate the distribution of sulfur types in two whole blood cell samples, in selected subcellular blood fractions, and in cell-free plasma from the tunicate Ascidia ceratodes . Whole blood cells are rich in sulfate, aliphatic sulfonate, and low-val…
Photoisomerization of the azo component in the supramolecular hydrogen-bonded assembly between 4,4‘-azabipyridine and 4-alkyloxybenzoic acid brings about a marked increase in its crystal to liquid crystal phase transition temperature.
It was observed that the photolysis of 4‘-chlorostilbenecarboxylic acid (CSC) in N,N -dimethylformamide (DMF) yielded mainly a syn head-to-head dimer. The molecular alignment in hydrotalcite interlayers has been investigated by electric linear dichroism (ELD) at room temperature in order to clarify the correlation bet…
The new monomer 1,2- o -isopropylidene-[ d ]-xylofuranose-3,5-cyclic carbonate (IPXTC) was prepared. The organometallic catalysts AlR 3 −H 2 O (R = ethyl, isobutyl), ZnEt 2 −H 2 O, and Sn(Oct) 2 were evaluated for the copolymerization of [ l ]-lactide ([ l ]-LA) with IPXTC. This work showed that Sn(Oct) 2 was preferre…
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The reorientation transition of the magnetization of ferromagnetic films is studied on a microscopic basis within a Heisenberg spin model. Using a modified mean field formulation it is possible to calculate properties of magnetic thin films with non-integer thicknesses. This is especially important for the reorientati…
The giant transverse magnetoresistance is observed in the case of photoinduced nonequilibrium carriers in an asymmetric undoped system of three GaAs/AlGaAs quantum wells at room temperature. In a magnetic field of 75 kOe, the resistance of nanostructure being studied increases by a factor of 1.85. The magnetoresistanc…
Definitions of fundamental quantities, and their units, for ionizing radiation are given, which represent the recommendation of the International Commission on Radiation Units and Measurements (ICRU). © 2011 International Commission on Radiation Units and Measurements.
Factors that affect quantitative analysis by surface-enhanced resonance Raman scattering (SERRS) have been investigated using azobenzotriazol and reactive dyes. Preaggregation of the silver colloid was the most effective method to obtain repeatable and reproducible scattering. Aggregation by poly(l-lysine) or spermine…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A new system has been developed for the study of both bulk and surface metal oxides by temperature programmed reduction (TPR) under both conventional linear heating and constant rate thermal analysis (CRTA) conditions. It is shown that constant rate temperature-programmed reduction (CR-TPR) is capable of producing hig…
New layered perovskite compounds, M II [La 2 Ti 3 O 10 ] (M = Co, Cu, and Zn) were synthesized by the ion-exchange reaction of the parent Na 2 La 2 Ti 3 O 10 in molten salts. The crystal structure of the as-synthesized phases was determined by the Rietveld refinement for the powder X-ray diffraction patterns. The unit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDegree of Acetylation of Chitin and Extent of Grafting PHB on Chitosan Determined by Solid State 15N NMRGa-er Yu, Frederick G. Morin, Geoffrey A. R. Nobes, and Robert H. MarchessaultView Author Information Pulp and Paper Research Ce…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Model PS(PI)5 and (PI)5PS(PI)5 Nonlinear Block Copolymers of Styrene (S) and Isoprene (I)Gabriel Velis and Nikos HadjichristidisView Author Information Department of Chemistry, University of Athens, Panepistimiopolis, Z…
Silica-supported Pd−Au clusters were characterized by Pd K and Au L 3 extended X-ray absorption fine structure (EXAFS) spectroscopy and Au L 2,3 X-ray absorption near-edge structure (XANES) spectroscopy. Pd−Au/SiO 2 catalysts with Pd/Au atomic ratios of approximately 1:1 were prepared by coadsorption of [Pd(NH 3 ) 4 ]…
Condensation reactions of mono- and didodecyl-substituted-2,5-diformylthiophene with hydrazine, p -diaminobenzene, 2,7-diaminofluorene, and 1,5-diaminonaphatalene give the corresponding polyazines (PAZs) and polyazomethines (PAMs), which have been characterized by thermal, structural, and optical analyses. The former…