Materials Literature
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The thermal‐stress fracture behavior of duplex ceramics is investigated by quenching in water and in oil. Comparison with the matrix materials shows that the critical quenching temperature difference, Δ T c , is not or is only slightly reduced, even for duplex ceramics of significantly reduced strength. In sintered co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal reactivity of hydrogenosilsesquioxane gelsV. Belot, R. Corriu, D. Leclercq, P. H. Mutin, and A. ViouxCite this: Chem. Mater. 1991, 3, 1, 127–131Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https…
The title complexes form stable mesomorphic phases, and provide a new series of thermotropic liquid-crystalline complexes containing tertiary phosphines co-ordinated to a transition metal.
Abstract This report describes the synthesis and redox behaviour of polyaniline in aqueous solutions of benzene sulphonic acid and 4‐toluene sulphonic acid. The characterization of the polymer was carried out by electronic spectra, FTIR studies and 1 HNMR in DMSO‐d 6 .
The synthesis and characterisation of a subphthalocyanine and its planar binuclear dimer: the first example of an aromatic macrocyclic dimer containing boron is reported.
The 5-dimethylaminoindolylfulgide–trichloroacetic acid (1 : 1.4) system in toluene was found to constitute a photochromic system having a non-destructive readout ability applicable to rewritable photon mode optical memories.
X-Ray photoelectron spectroscopy (XPS) data of Pd clusters in NaY, MgY and HY zeolites show that the chemical shift of the Pd 3d5/2 line is dependent on the concentration of the protons and their position in the zeolite. The positive charge or ‘electron deficiency’ of the Pd particles is significant even for Pd/NaY wh…
The fracture toughness behavior during crack growth ( K R ‐curve behavior) of duplex ceramics is investigated. Different types of K R ‐curves can be distinguished depending on the microstructural designs of these materials which are characterized by the volume fraction and size of the dispersed pressure zones, and by…
Electrically conducting π-conjugated copolymers consisting of π-excessive thiophene-2,5-diyl and π-deficient pyridine-2,5-diyl monomer units show a unique cyclic voltammogram with an unusually large potential difference between the doping and the undoping peaks, and their electronic and fluorescence spectra support oc…
Systematic investigations have allowed us to formulate a structural model representing the relationship between vitrification and mesogenity in low-molecular-weight liquid-crystalline compounds. The tendency to transform the highly viscous mesophases into glass phases is caused mainly by the bulkiness of the molecules…
A series of palladium clusters containing from four to several hundred Pd atoms in the metal skeleton has been prepared and characterized with respect to structure and chemical properties, including catalytic activity. For smaller clusters good agreement was observed. between single-crystal X-ray and EXAFS structural…
Photoluminescence and intramolecular energy-transfer properties of Eu2(H2O)12[Mo8O27]·6H2O, 1 have been determined in connection with the crystal structure. The compound has been prepared by treating K2[MoO4] with Eu(NO3)3 in aqueous solution at pH 3.0 and isolated in a crystalline form with a belt structure. A single…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCleavage of the nitrogen-nitrogen bond in a high oxidation state tungsten or molybdenum hydrazine complex and the catalytic reduction of hydrazineRichard R. Schrock, Timothy E. Glassman, and Michael G. ValeCite this: J. Am. Chem. Soc. 1991, 113, 2, 725–726Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTpH-responsive liposomes which contain amphiphiles prepared by using lipophilic radical initiatorHiromi Kitano, Yasumasa Akatsuka, and Norio IseCite this: Macromolecules 1991, 24, 1, 42–46Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Pu…
Abstract Raman spectra of the CC stretching region of strained gel‐spun ultradrawn ultrahighmolecular weight polyethylene fibers were recorded. On the low‐wavenumber side of both the asymmetric and symmetric band, an additional broad band appeared during straining of the fiber, indicating the presence of CC bonds ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and catalytic activity of alumina-supported platinum-cobalt bimetallic catalysts. 1. Characterization by x-ray photoelectron spectroscopyZoltan Zsoldos, Tamas Hoffer, and Laszlo GucziCite this: J. Phys. Chem. 1991, 95, 2, 798–801Publication Date (Print):January 1,…
When an aqueous AgClO4–sodium dodecylsulphate (SDS)–isopropyl alcohol (Pri OH) solution was photolysed with 253.7 nm light, a sharp and intense absorption band of colloidal silver (λ= 390–400 nm) appeared after a relatively long induction period. In contrast, the sharp colloidal absorption rapidly developed when an Ag…
Abstract New soluble polyimides with inherent viscosities of 0.2–0.6 dL/g were synthesized from 3,4‐bis (4‐aminophenyl)‐2,5‐diphenylfuran and various aromatic tetracarboxylic dianhydrides by the conventional two‐step method which involved ring‐opening polyaddition and subsequent cyclodehydration. Almost all of the pol…
This review critically evaluates the suitability of Auger spectral line shape analysis as a source of electronic structure information. Methods for extracting the true Auger line shape from the raw data and a theoretical framework for semiquantitative interpretation of that line shape are presented. A wide range of re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-scattering study of kinetics of spinodal decomposition in a polymer solutionJyotsana Lal and Rama BansilCite this: Macromolecules 1991, 24, 1, 290–297Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991h…