Materials Literature
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Synthese des etudes cristallographiques realisees sur les composes d'addition 1:1 de l'hexafluorobenzene avec des hydrocarbures et des amines aromatiques. Dans tous les composes etudies, les molecules associees sont empilees alternativement en des colonnes infinies. Beaucoup de ces composes ont des structures cristall…
An attempt at reviewing the present knowledge of dislocation intrinsic mobility in single phase chemically stable crystals is made. Metals as well as non-metals are considered. It is shown that plasticity of materials is in general dominated by dislocation core effects.
The X-ray crystal structure of (InOPri)5(µ2-OPri)4(µ3-OPri)4(µ5-O) reveals a square-pyramidal arrangement of indium atoms about a central oxygen; five of the alkoxo groups are terminal, four are µ2 about the basal metals, and four are µ3 about the triangular faces of the pyramid; the geometry about each metal is highl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultilayer activity and implications of hydrogen peroxide in the catalytic reduction of dioxygen by a dicobalt cofacial bis(porphyrin) (Co2FTF4)James P. Collman, Neil H. Hendricks, Charles R. Leidner, Emmanuel Ngameni, and Maurice L'HerCite this: Inorg. Chem. 1988, 27, 2, 38…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRoom temperature photoassisted formation of hydrogen-molybdenum bronzes with an alcohol as a hydrogen sourcePierre Pichat, Hoang Van Can, and Can Hoang VanCite this: J. Phys. Chem. 1988, 92, 2, 467–470Publication Date (Print):January 1, 1988Publication History Published onli…
The square planar S4 donor complex [Pd(L1)]2+(L1= 7,16-dimethyl-1,4,10,13-tetrathia-7,16-diazacyclo-octadecane) shows a reversible PdII/I redox couple at E½–0.74 V vs. Fc/Fc+; in contrast, the complex [Pd(L2)]2+(L2= 1,4,10,13-tetrathia-7,16-diazacyclo-octadecane) shows distorted octahedral N2S2+ S2 co-ordination, and…
The constrained blister test (CBT) was designed to measure the energy of interfacial adhesion ( y) of polymeric films and coatings. Theoretical analysis of the CBT established a relationship between blister growth and interfacial parameters of the form A(t) A(t0)=exp[βp2h ph-γ (t- t0)] where A(t) is the blister area a…
L'etude des relations composition structure est menee par spectrometrie RMN avec rotation de l'echantillon selon l'angle magique. L'etude porte sur les trois systemes suivants: Li 2 O−SiO 2 −P 2 O 5 ; K 2 O−SiO 2 −P 2 O 5 et Na 2 O-SiO 2 -P 2 O 5
Etude du systeme SnF 2 −P 2 O 5 . On etudie le mecanisme de la fonte du verre, la structure du systeme en fonction de la composition, la dilatatation thermique, la densite, la durete et la stabilite chimique
The characteristics of combined buoyancy and thermocapillary flow for liquid metals in a rectangular cavity have been studied numerically. Results show that, for augmenting buoyancy and surface tension forces, qualitative flow patterns and isotherms are unchanged, but enhanced fluid velocities and heat transfer rates…
A computational method is presented for fitting woven fabric to nonalgebraic surfaces by using numerical-analysis techniques. The method is based upon modelling the process of smoothing fabric over a surface. Fabric co–ordinates are mapped onto the surface to be fitted. No assumptions are made about the surface to be…
Abstract To test the possibility that the structural Fe 3+ in clay minerals can be biologically reduced, nontronite was mixed with sucrose and an aqueous extract from a Chinese paddy soil and incubated for 14 d at room temperature. Reflectance spectra, x‐ray diffraction patterns and Fe 2+ /Fe 3+ ratios were determined…
Preparation de nouveaux complexes verts de cerium(IV) dans lesquels le metal est pris en sandwich entre deux coordinats macrocycliques differents (une porphyrine et une phtalocyanine) ont ete prepares et caracterises par spectroscopie UV-visible, RMN du proton, voltammetrie cyclique et diffraction RX a −100°C. Une oxy…
The techniques of differential scanning calorimetry and electron microscopy were combined to locate collagens with different thermal stabilities in bovine dermis. When calfskin was heated at 1.25 degrees C/min, denatured cores developed in the fibrils at 65 degrees C, leaving native-banded sheaths. Coincident with the…
The electrical resistivity of bulk GexTe100-x glasses has been measured as a function of temperature and pressure. Under high pressure, all the glasses were found to undergo sharp discontinuous transitions from glassy semiconductors to crystalline metal. Several of the observed properties such as the transition pressu…
By means of detailed calculations with the Finnis-Sinclair potential and short-memory augmented rate theory we have investigated the isotope effect for vacancy diffusion in b.c.c. α-Fe. The experimental value is consistent with a model in which a double barrier bars the diffusion path.
Abstract An improved synthesis for 5,10,15,20‐tetrakis(pentafluorophenyl)porphyrin, 5,10,15,20–tetrakis(2,4,6‐trimethylphenyl)porphyrin and 5,10,15,20‐tetrakis(2,6‐dichlorophenyl)porphyrin by an acid‐catalysed condensation of pyrrole and properly substituted aldehyde, followed by oxidation, is reported, with yields of…
The spin-gas model of liquid crystals is employed to describe and explain single, double and quadruple reentrances of nematic and smectic phases, as well as reentrances below the monolayer smectic A1 phase, all of which are observed experimentally. New sextuple (and octuple) reentrances are predicted in the sequence n…
Abstract Cs 4 Sn 5 S 12 · 2 H 2 O wurde durch hydrothermale Reaktion von Cs 2 CO 3 mit SnS 2 bei einer Temperatur von 130°C dargestellt. Eine Röntgenstrukturanalyse ergab, daß die Verbindung schichtartige Polythiostannat(IV)‐Anionen [Sn 5 S ]∞ beinhaltet, in denen die Grundelemente trigonale SnS 5 ‐Bipyramide sowie Sn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray analysis of the structure of the thermotropic copolyester XYDARJohn Blackwell, H. M. Cheng, and A. BiswasCite this: Macromolecules 1988, 21, 1, 39–45Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988ht…