Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXAFS and thermogravimetry study of the sintering of calcium supported on carbonD. Cazorla-Amoros, A. Linares-Solano, C. Salinas-Martinez de Lecea, H. Yamashita, T. Kyotani, A. Tomita, and M. NomuraCite this: Energy Fuels 1993, 7, 1, 139–145Publication Date (Print):January 1,…
The kinetics of crystal growth of hydroxyapatite [Ca5(PO4)3OH, HAP], the thermodynamically most stable calcium phosphate phase, at 37 °C, pH 7.4 and ionic strength 0.1 mol dm–3 has been investigated. The kinetics results showed a surface-controlled spiral growth mechanism. The presence of 1,2-dihydroxy-1,2-bis(dihydro…
The X-ray structure of a unique dinuclear copper(II) compound containing a single hexafluorosilicato bridge, [Cu2L2(H2O)2(SiF6)]·2H2O (HL =N3-salicyloylpyridine-2-carboxamidrazone), is reported.
Spunbonded nonwoven fabrics are extensively used in a number of technical applications because of their physical, tensile, and hydraulic characteristics. In many cases, fabric is subjected to normal compressive loads, and the physical, tensile, and hydraulic properties change with these loads depending on the compress…
Reinforcing properties for polymers and elastomers, rheological properties of high density aqueous slurries, hidding power, lubricating properties of platey particles strongly depend on their size distribution and shape factor or aspect ratio (A.R.). Determinations of A.R. of fine particles by conventional methods are…
The complex anion [W2O5(cit)2]6– was obtained by crystallisation from an equimolar aqueous solution of sodium tungstate and citric acid (H4cit). It has been characterised by elemental analysis, IR and 1H and 13C NMR spectroscopy. The IR spectrum is consistent with a monooxo-bridged dinuclear structure as revealed by a…
This study was designed to isolate, chemically characterize, and pharmacologically evaluate the active principles present in a crude extract from the bark of Hymenaea martiana. β-Sitosterol-3-O-glycoside and three rhamnosides (eucryphin, engelitin and astilbin) were identified. As demonstrated previously with an alcoh…
Phthoxazolin A is a new inhibitor of cellulose biosynthesis produces by Streptomyces sp. OM-5714. The active compound was isolated, and the structure was elucidated by spectrometric analyses.
It is well known that trivalent chromium plating technology has many advantages. Although the technology has been applied in production, some problems remain; for instance, the plated film cannot be thickened at will and its glossiness lacks a bluish hue. Accordingly, these factors may, to some extent, prevent the tec…
Threshold hydrogen concentration (CthH) and threshold pH (pHth) for hydrogen-induced cracking (HIC) were determined for commercial sour service linepipe steels exposed to H2S-saturated buffer solutions. Metallographic examination of the steel samples by optical and electron microscopy showed that ultrasonic C-scan is…
The kinetics of the reactions of Br[4p(2PJ)] with CH3SiH3(1) and (CH3)2SiH2(2) have been measured using flash photolysis/time-resolved atomic resonance spectroscopy over the temperature ranges 350–550 and 390–550 K, respectively. The results are k1=(4.0 ± 0.5)× 10–10 exp(–19.7 ± 0.5 kJ mol–1/RT) and k2=(4.3 ± 0.8)× 10…
Spectroscopic investigations of surface flashover of insulators are performed with materials such as alumina and PMMA (polymethyl methacrylate) in vacuum under the application of a high-voltage pulse. The spectra of emitted light from the flashover plasma reveal the roles played by the background gases in the system (…
The product distributions for partial oxidation of methane over Fe2(MoO4)3 catalyst are compared with those for partial oxidation of methanol in the presence and absence of methane over the same catalyst under similar reaction conditions. The results suggest that CH3OH is the precursor of HCHO which is the main produc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMutual solubilities: water-glycol ethers and water-glycol estersRichard M. StephensonCite this: J. Chem. Eng. Data 1993, 38, 1, 134–138Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://pubs.acs.org/d…
The crystal structures of five 4-aminophenyl 4-X-phenyl sulfones (X = NO2, CN, F, OCH3, NH2) are reported. The molecules present a relevant degree of charge redistribution where electronic charge transfer mainly occurs from the amino to the sulfonyl group with consequent shortening of C–N and C–S distances and increas…
All articles of this category 5,6-Dihydro-1,3-dithiolo[4,5- b ][1,4]dithiin-2-one ( 3 ) was prepared in one step starting from thiapendione ( 1 ; [1,3]dithiolo[4, 5- d ][1,3]dithiole-2,5-dione) in 55% yield via 4,5-dimercapto-1, 3-dithiol-2-one ( 2 ). Coupling of 3 in triethyl phosphite gave bis(ethylenedithio)tetrath…
The reaction kinetics for oxidation of H 2 on the Ni-YSZ-cermet electrode in Solid Oxide Fuel Cells (SOFC) have been studied using impedance spectroscopy. The polarisation resistance, R P , has been found to consist of two separate contributions with one being strongly dependent on both the partial pressure of H 2 , p…
Direct nitridation of Al-alloys such as Al-Y, Al-Ca, and Al-Li was investigated with particular emphasis on the alloy composition, reaction temperature and reaction time. The alloys Al-2.3wt% Li, Al-5.0wt% Li and Al-5.0wt% Ca converted completely to AlN in very short soaking time at 1000°C. For Al-1.0wt% Li and Al-0.5…
We measured Raman spectra of diamonds in ureilite meteorites and of diamonds synthesized under static high pressure, under shock-induced high pressure, and by chemical vapor deposition. The full width at half maximum (FWHM) and wavenumber position of a Raman line of F2g (at 1332 cm−1) are compared. Both the wavenumber…
In order to investigate the physical basis of protein stability, two mutant L-lactate dehydrogenases (LDH) and the wild-type enzyme from Bacillus megaterium were analyzed for differences in quaternary structure, global protein conformation, thermal stability, stability against guanidine hydrochloride, and polypeptide…