Materials Literature
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A selective thermal oxidation method was developed for the speciation of carbonaceous aerosols collected on filters into organic carbon (OC) and elemental carbon (EC). The technique is based on studying the thermal oxidation of microcrystalline graphite by MnO2as well as various organic compounds. The procedure uses a…
A series of 3,6-dialkylphthalonitriles and 3,6-bis(4,4,4-trimethoxybutyl) phthalonitrile have been prepared via Diels–Alder reactions of 2,5-disubstituted furans or thiophene 1,1-dioxides with fumaro-nitrile. The phthalonitriles were converted into the title phthalocyanines as metal-free and copper(II) derivatives. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtended x-ray absorption fine structure investigations of nickel hydroxidesK. I. Pandya, W. E. O'Grady, D. A. Corrigan, J. McBreen, and R. W. HoffmanCite this: J. Phys. Chem. 1990, 94, 1, 21–26Publication Date (Print):January 1, 1990Publication History Published online1 May…
This investigation has concerned the active dissolution of a duplex stainless steel in two different acidic solutions together with a comparison of the active dissolution of the corresponding α-and γ-phases in order to establish the type of interaction between the phases. In the two acid solutions investigated, it bec…
The structural changes which occur during the swelling and dispersion in water (D2O) of montmorillonite and Laponite RD (a model synthetic hectorite-type clay) have been investigated by neutron diffraction and small-angle neutron scattering (SANS). By using samples where the clay platelets are initially aligned in the…
This review examines the electrochemical methods available to corrosion scientists today and developments that have taken place in the past 25 years. The fundamental principles of the methods are outlined and some practical difficulties explained.
An electron-irradiation induced crystalline-to-amorphous (C-A) transition in α-Sic single crystals of the 6H polytype has been studied as a function of irradiation temperature, incident electron energy and orientation of the incident beam, by means of ultra-high voltage electron microscopy. The C-A transition can be i…
Dynamics of atoms near the glass transition of simple classical liquids is studied on the basis of the mesoscopic stochastic-trapping diffusion model recently developed by Odagaki [J. Phys. A 20, 6455 (1987); Phys. Rev. B. 38, 9044 (1988)]. The jump rate of an atom (tracer) is assumed to have a distribution following…
The cyclic process of biosynthesis and degradation of poly(3-hydroxyalkanoate) (PHA) was studied in Alcaligenes eutrophus under conditions of nitrogen-limitation of growth. A. eutrophus cells, which had accumulated poly(3-ydroxybutyrate) (PHB) of 55 wt% content within cells from butyric acid, were transferred into a n…
2014 Une mthode permettant de corriger les effets d'absorption et de fluorescence en mi- croanalyse X d'chantillons transparents pour la microscopie en transmission (S.) TE.M. est prsente. Cette procdure n'exigeant la connaissance d'aucun paramtre comme l'paisseur ou la densit de l'chantillon ni d'aucun coefficient co…
The Mehlich‐III method used for the determination of available P in 82 Quebec soils was compared to five other chemical methods (Bray‐II, Bray‐I, Mehlich‐II, Mehlich‐I and Olsen) and to two anion exchange resin techniques (F‐ and HCO‐ 3) In general, very good correlations were found between Mehlich‐III, Bray‐II and Br…
A study of the complex atomic susceptibility of erbium-doped fiber amplifiers operating near the 1.53- mu m transition (/sup 4/I/sub 13/2/-/sup 4/I/sub 15/2/) developed from a semiclassical theoretical description is presented. Expressions for the emission cross section sigma /sub e/( lambda ) and absorption cross sec…
Abstract This article discusses the history of shape memory alloys (SMAs) along with their properties, capabilities, and crystallography, including phase transformations that occur during thermal treatment. It describes the thermomechanical behaviors of SMAs and explains how to characterize them using differential sca…
Rotational power losses have been measured on nonoriented grain-oriented silicon steel sheets under different rotational flux conditions. Several methods have been proposed for this purpose. Among these, a method based on the measurement of the field quantities B/sub x/, B/sub y/, H/sub x/, and H/sub y/ seems to be th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegime transitions in fractions of isotactic polypropyleneStephen Z. D. Cheng, James J. Janimak, Anqiu Zhang, and H. N. ChengCite this: Macromolecules 1990, 23, 1, 298–303Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue…
The surface properties of cobalt oxide after two different pretreatments have been investigated by means of Fourier-transform infrared (FTIR) spectroscopy of adsorbed carbon monoxide, methanol and ammonia. The surface of evacuated Co3O4 exposes CO3+ cations that react rapidly with CO, producing Co2+ and probably CO+,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 and aluminum-27 NMR study of zeolite formation from alkali-leached kaolinites: influence of thermal preactivationA. Madani, A. Aznar, J. Sanz, and J. M. SerratosaCite this: J. Phys. Chem. 1990, 94, 2, 760–765Publication Date (Print):January 1, 1990Publication Hist…
Origins of composite materials, J.E.Bailey the potential of composite materials, D.P.Bashford types of materials, D.R.Lovell matrices for advanced structural composites, E.Green the fibre-matrix interface and composite, strength, G.Dorey micromechanics and properties of fibre composites, F.R.Jones a design philosophy…
Abstract All refractory metals, except osmium and iridium, have the highest melting temperatures and lowest vapor pressures of all metals. This article discusses the commercial applications, and production procedures of refractory metals and alloys. These procedures include fabrication, machining, forming, cleaning, j…
The three xylenes, 1,2-, 1,3-, and 1,4-dimethyl benzene, provide a well-characterized family of isomeric molecules within which the melting points vary greatly while fluid-state properties such as boiling points and viscosities remain very similar. Because all pure isomers crystallize rapidly on cooling, their behavio…