Materials Literature
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One of the critical steps in the production of microcellular polymers is the dissolution of gas into a polymer matrix. In this paper, the formation of a gas and semi-crystalline thermoplastic solution is studied in the presence of a crystallizing matrix with particular emphasis on the ultimate effects of crystallinity…
A complete set of sum rules is obtained for polarization-dependent x-ray-absorption fine structure and x-ray circular magnetic dichroism (CMD), analogous to those for CMD derived by Thole et al. These sum rules relate x-ray-absorption coefficients to the ground-state expectation values of various operators. Problems w…
ADVERTISEMENT RETURN TO ISSUEPREVArticle[(Co(H2O)4)2(H2W12O42)]n6n-: A Novel Chainlike Heteropolyanion Formed by Paradodecatungstate and Cobalt(II) IonsCarlos Gimenez-Saiz, Jose Ramon Galan-Mascaros, Smaiel Triki, Eugenio Coronado, and Lahcene OuahabCite this: Inorg. Chem. 1995, 34, 2, 524–526Publication Date (Print):…
A three-dimensional field solution is presented for radially polarized permanent-magnet cylinders. The derived field formulae are evaluated in terms of finite sums of elementary functions. They are readily programmed and ideal for performing rapid parametric studies of the field distribution outside of cylinders made…
The luminescence behaviour of two macrocyclic ligands incorporating naphthyl fluorophores has been studied in water and acetonitrile. The ligands 1,4,7-tris(methylcarbamoylmethyl)-10-(2-naphthylmethylcarbamoylmethyl)-1,4,7,10-tetraazacyclododecane, 1 and 1,4,7,10-tetrakis(2-naphthylmethylcarbamoylmethyl)-1,4,7,10-tetr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStirring Rate as a Critical Parameter in Chiral Symmetry Breaking CrystallizationDilip K. Kondepudi, Kim L. Bullock, Jennifer A. Digits, and Portia D. YarboroughCite this: J. Am. Chem. Soc. 1995, 117, 1, 401–404Publication Date (Print):January 1, 1995Publication History Publ…
Effects of the Ti buffer layer on crystallization processes of lead-zirconate-titanate (PZT) films by the sol-gel deposition technique were investigated. The Ti buffer layer was deposited on a Pt/TiN/SiO 2 /Si substrate by electron beam evaporation at the back-pressure of 1×10 -11 Torr. Homogeneous crystalline PZT fil…
Experimental methods and concepts in high-speed loading dynamic crack propagation rate-dependence and impact fracture toughness of plastics impact behaviour of composites - modelling, characterization and effect on properties.
The catalytic oxidation of tertiary amines to the corresponding N-oxides by [XO4{MO(O2)2}4]3–(X = P or As, M = Mo or W) and by [M2O3(O2)4]2– with H2O2 as co-oxidant has been studied. Epoxidation of alkenes and oxidation of alcohols by [M2O3(O2)4]2– with H2O2 as co-oxidant has also been examined and compared with that…
Coordination of zinc porphyrins by pyridine ligands is used to construct macrocyclic complexes: the self-assembly properties of the cyclic oligomers depends critically on the covalent structure of the monomer units which can be selected to give stable di-, tri- or tetra- meric assemblies.
CuI-exchanged ZSM-5 contacted with N2 at room temperature or at 77 K exhibits a narrow IR band at 2295 cm–1. On the basis of 14N2/14N2 and 14N2/14N15N/15N2 isotopic substitution experiments this peak is assigned to the N—N stretching vibration of CuI—N2 end-on dinitrogen complexes formed on isolated CuI sites inside t…
Abstract A review is presented of recent experimental results of low temperature studies of composition driven metal-insulator transition in perovskite oxides of the ABO3 class. The evolution of physical properties like conductivity, tunnelling, density of states and magnetoconductivity has been studied at low tempera…
The continuous precipitation of the β b.c.c. phase in Mg-Al gives rise to elongated platelets which exhibit a Burgers orientation relationship and whose habit plane is parallel to the matrix basal plane. The habit plane is found to contain a periodic array of secondary edge dislocations. It is shown that the epitaxial…
After referring briefly to the earlier developments of computer-based PD measurements in the 1970s, the paper outlines how the introduction of new technology has resulted in the design and production of a number of digital systems for use in test laboratories and on site. In order to avoid overgeneralization, the basi…
The first synthesis of a porphyrin-2,3,12,13-tetraone and porphyrin-2,3,7,8-tetraones is reported; these compounds are useful compounds for the construction of laterally-extended porphyrin systems as is illustrated by the synthesis of linear and bent tris-porphyrins, 10 and 11, respectively, and the tetrakis-porphyrin…
MCM-41 is loaded with platinum via different pathways, resulting in highly active oxidation catalysts.
In order to understand better the drape phenomenon of fabrics, a non-linear finite-element code was developed and the three-dimensional drape shapes of a woven fabric were simulated by using the code. The woven fabric was assumed to be an elastic material with orthotropic anisotropy. The fabric was considered as a thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Side-Chain Liquid Crystalline Homopolymers and Block Copolymers with Well-Defined Structures by Living Anionic Polymerization and Their Thermotropic Phase BehaviorMasayuki Yamada, Akira Hirao, Seiichi Nakahama, Tsukasa Iguchi, and Junji WatanabeCite this: Macrom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and Bond Energies of the Transition-Metal Carbonyls M(CO)5 (M = Fe, Ru, Os) and M(CO)4 (M = Ni, Pd, Pt)Andreas W. Ehlers and Gernot FrenkingCite this: Organometallics 1995, 14, 1, 423–426Publication Date (Print):January 1, 1995Publication History Published online1…
The effect of temperature on adsorption isotherms of cyclopentane on mesoporous MCM-41 molecular sieves with different pore size has been determined at 243–333 K. The occurrence of adsorption hysteresis upon capillary condensation in mesopores depends on the pore critical temperature, which is lower than the bulk crit…