Materials Literature
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Une étude en microscopie et diffraction électroniques a été réalisée sur des échantillons de goethite et d'hématite, associées aux kaolinites, prélevés le long de profils d'altération latéritique (Cameroun). La morphologie de la goethite varie suivant le site de développement, au contraire de celle de l'hématite. Des…
The synthesis and X-ray crystal structures of the anions SnAs144– and As224–, which represent the largest polyarsenides characterized to date, are reported.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduct selectivity during methanol decomposition on titania powdersE. A. Taylor and G. L. GriffinCite this: J. Phys. Chem. 1988, 92, 2, 477–481Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.…
To our knowledge, hexacyanoferrate (III) and hexacyanomanganate (III) are the best representative cases for the study of solvent effects on redox potentials of anions. To enlarge examples in this field, it is shown here that two heteropolyacid potassium salts, and , as studied by slow sweep rate cyclic voltammetry, un…
An exact solution and an approximate solution have been derived for the columnar dendrite model proposed by Ohnaka, 8) in which a solidification rate, equilibrium distribution coefficient and diffusion coefficient in solid are assumed to be constant throughout the solidification. By comparing with the exact solution,…
The effect of exposure of Wyoming bentonite to glacial acetic acid has been studied by F.t.i.r., X.p.s, SEM and acidity measurements, in order to investigate the possibility of using such a non-aqueous technique as an alternative activation process. Treatment with glacial acetic acid, results in an overall increase in…
The complete ODF of titanium, cold rolled up to 80% deformation, was calculated using the series expansion method, including the zero range method. The rolling texture obtained after 80% deformation is mainly characterized by the well‐known orientation {0001} ± 40°TD but with distinct spread ranges about it. At about…
Zinc–chromium mixed oxides, with Zn/Cr atomic percentage ratios between 33:67 and 50:50, have been prepared by a coprecipitation procedure. Their bulk structure has been investigated by the techniques of X-ray diffraction, infrared spectroscopy and electron spin resonance spectroscopy. They all appear monophasic to X.…
Tin(IV)–lead(IV) exchange and mercury(II)–lead(IV) exchange reactions have been used to obtain 2-thienyl-lead triacetate (3), 2-thienyl-lead tribenzoate (4), 3-thienyl-lead triacetate (16), 2-furyl-lead triacetate (21), and 3-furyl-lead triacetate (31). In reactions with the β-dicarbonyl compounds (7), (11), and (13),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBand electronic structure of the lithium molybdenum purple bronze Li0.9Mo6O17Myung Hwan. Whangbo and Enric. CanadellCite this: J. Am. Chem. Soc. 1988, 110, 2, 358–363Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 Jan…
Reaction of [MoCl4(NNMePh)] with (Bun4N)2[Mo2O7] yields a co-ordination complex with the hexanuclear oxomolybdate core, (Bun4N)2[Mo6O18(NNMePh)]; the reaction is general with appropriate precursors in providing a ready entry into the class of co-ordination compounds of the types [Mo5O18(ML)]n– and [W5O18(ML)]n–, with…
Aimed at both the novice and the experienced scientist, this mini-encyclopedia describes over 100 materials methodologies, including evaluation, chemical analysis, and physical testing techniques. Each technique is presented in terms of its use, sample requirements, and the engineering principles behind its methodolog…
Four new pregnane glycosides, named periplocosides J, K, F and O, have been isolated from the antitumor fraction of Periploca sepium (Asclepiadaceae). Their structures were established by various nuclear magnetic resonance techniques and chemical evidence.
During the past 50 years, the 90–10 iron modified cupronickel alloy (CA706) has been developed extensively for marine and offshore applications. It has proved to have good corrosion, erosion–corrosion, and fouling resistance to sea water. The behaviour and protection mechanism of the alloy in these environments has be…
Les supports sont la gomme d'acacia,les dextrines et les maltodextrines. La mesure de la viscosite, l'observation de la forme et des dimensions des globules en microscopie electronique et l'etude de la composition de l'huile par chromatographie phase gazeuse-spectrometrie de masse sont effectuees pour chaque matrice e…
Poly(ethylene oxide) (PEO) adsorbed on small silica (ludox) particles was studied by means of dynamic light scattering, as a function of segmental binding strength (pH). The results show that the hydrodynamic layer thickness δ h is constant or increases slightly with pH up to pH ~ 10.5 and then drops sharply to zero.…
Abstract Electrochemically partially‐oxidized Cu specimens are transferred from the electrolyte (pH 13 and 14) within a closed system without air contact to the UHV and examined with XPS especially by interpreting the x‐ray‐induced Auger signal L 3 MM. The signal was fitted with standard spectra of clean Cu and Cu 2 O…
A brief review of the structural and electronic properties of Fibonacci, Thue-Morse, and random superlattices (SLs) is given. Quasiperiodic Fibonacci SLs and 1-D analogs of quasicrystals; their wave behavior is characterized by critical hierarchy of gaps. The interest in random SLs focuses on the problem of Anderson l…
The synthesis of the µ-carbido species of formula (pcFe)2C (pc = phthalocyaninato dianion) has been accomplished by reaction of pcFe with Cl4, while reaction of (pcFe)2C with 1-methylimidazole produces an adduct of formula [(1-Meim)pcFe]2C; on the basis of i.r. and visible spectra and single crystal X-ray data, both s…
The crystallization process of noncrystalline indomethacin (IMC) obtained by the grinding and by the fusion method was analyzed by a kinetic method. The noncrystalline samples of IMC were the α form ground for 10 h at 4°C (GNCγ), the γ form ground for 10h at 4°C (GNCγ) and the fused solid (NC). Ten kinetic models were…