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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermediates in the formation of gold clusters. Preparation and x-ray analysis of [Au7(PPh3)7]+ and synthesis and characterization of [Au8(PPh3)6I]PF6J. W. A. Van der Velden, P. T. Beurskens, J. J. Bour, W. P. Bosman, J. H. Noordik, M. Kolenbrander, and J. A. K. M. BuskesCi…
Discharge and charge characteristics of cathode‐active materials for lithium batteries were studied. Electron acceptors of charge transfer complex with high electron affinity were examined as cathode‐active materials because they were expected to have high cell voltage. These electron acceptors are 2,4,7‐trinitro‐9‐fl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInduced internal redox processes in molybdenum-sulfur chemistry: conversion of tetrathiomolybdate(2-) ion to octathiodimolybdate(2-) ion by organic disulfidesWie Hin Pan, Mark A. Harmer, Thomas R. Halbert, and Edward I. StiefelCite this: J. Am. Chem. Soc. 1984, 106, 2, 459–4…
This theory determines the dependence of the Huggins coefficient kH on the interaction potential between rigid spheres. Hard-sphere interactions represent a minimum, with kH increasing for either attractive or longer-range repulsive potentials. Although derived for model potentials, the sticky sphere for short-range a…
Description Discusses zirconium extraction and reduction to tubes; recent work on basic properties; fracture properties, including stress-corrosion cracking and hydrogen cracking; high-temperature properties; texture-related work with special interest in creep and growth; and waterside corrosion.
Determination de la structure cristalline de la forme basse temperature de BaB 2 O 4 . Systeme trigonal-groupe d'espace R3c avec a=8,380 A, α=96,65°. Cette structure est voisine de la forme haute temperature de BaB 2 O 4 , contenant des anions [B 3 O 6 ] 3− quasi-plan. Coordination du baryum differente entre les 2 for…
The structural and electrical properties of different (TMTTF)2MF 6 compounds are described and the rôle of the anion size is investigated through the behaviour of the SbF6 salt for which a critical increase of the resistivity occurs below 154 K. The effect of alloying (TMTTF)2SbF6 with AsF6 or PF6 is also studied and…
Diatoms, which possess distinctive skeletal valves of opaline silica, show steady incremental reduction of size with successive vegetative divisions. Size reduction is explained by consistent formation of slightly smaller new valves inside the old ones. Diatoms cannot be induced to become sexual until a certain critic…
Ultrasonic irradiation of a mixture of benzyl bromide, potassium cyanide, and alumina in an aromatic solvent yields benzyl cyanide, whereas mechanical agitation gives the Friedel–Crafts type product; sonication changes the main reaction pathway from aromatic electrophilic to aliphatic nucleophilic substitution.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDicopper(II) chloro and azido inclusion complexes of the [24-ane-N2S4] binucleating macrocycle. Synthesis, crystal and molecular structures, and spectral, magnetic, and electrochemical propertiesYvette Agnus, Remy Louis, Jean Paul Gisselbrecht, and Raymond WeissCite this: J.…
This paper will present evidence indicating that the root cause of cathodic disbondment of protective organic coatings is the displacement of the coating by a high pH aqueous film between the coating and the substrate. This is based upon experiments involving delamination caused by soaking in ammonium hydroxide soluti…
The new mineral katoite, Ca3Al2(SiO4)(OH)8, occurs in Pietramassa near Montalto di Castro (Viterbo, Italy), associated with many other hydrated calcium silicates and aluminates in the vugs of a phonolite which effused through argillaceous marls of Pliocene age. Microprobe and TG analyses yielded the empirical formula…
On montre que les verres de fluorophosphate de plomb et d'etain possedent une association extraordinaire de temperature de transition vitreuse tres basse et de tres bonne resistance a l'attaque de l'eau. Une partie de ce comportement peut etre expliquee par la separation de phases et on propose un modele de structure
The deformation of an initially spherical liquid drop moving under the action of gravity in another fluid with which it is completely miscible is investigated under conditions of small values of the drop Reynolds number. It is found experimentally that such a drop evolves into an open torus which subsequently expands,…
Abstract We synthesized 102 new 1,4‐bis‐[4‐subst.‐benzoyloxy]‐2‐n‐alkylbenzenes of the general formula magnified image with R = alkyl, alkyloxy, alkanoyloxy, alkyloxycarbonyloxy and n = 0 to 16. Surprisingly all of the new compounds are liquid crystalline nematic. Thus it is proved that lateral long chain substituents…
Description Discusses the effects of defects on strength, stiffness, stability, and service life of composite material. 14 papers discuss the observation and measurement of defect location and size; experimental evidence of consequences of defect; analytical models for predicting defect behavior; and observations of f…
The elastic Gibbs function for BaTiO3 introduced by Buessem, Goswami and Cross1 has been modified by including the last symmetry permitted sixth order term HP12P22P32 with a coefficient H = 4.91 × 109 Vm9 C-5. The function predicts the correct high electric field behavior of the low temperature ferroelectric: ferroele…
We have combined the Maier Saupe theory [1] of the nematic-isotropic transition and the Flory Huggins theory of mixtures to describe the phase diagrams of two nematogens A + B. The two components can have different order parameters SA, SB in the mixture. We can then predict the morphology of the phase diagrams in term…
The precipitation of calcium carbonate from aqueous solutions has been studied at supersaturations sufficient for spontaneous precipitation but low enough to enable highly reproducible experiments to be carried out with respect to induction periods and rates of precipitation. The threshold for the onset of calcium car…
Photoexcitation of the oxygen-to-metal charge-transfer band (323 nm, ε= 1.35 × 104 dm3 mol–1 cm–1) of [NBu4]4[W10O32] in acetonitrile results in the reduction of WVI to WV[quantum yield, φ=(1–2)× 10–2] with accompanying formation of 1-butene in less than stoicheiometric yield (70%). Prolonged irradiation leads to the…