Materials Literature
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Abstract L‐Isoleucine and the isomorphic amino acids L‐leucine and L‐valine serve as a model system in the examination of the effects of impurities on the purity and morphology of crystals recovered from batch crystallizations. Factors are determined that influence crystal purity and, concomitantly, crystal size and s…
Oxide axial profiles for Zircaloy-4 cladding measured for 17 fuel rods irradiated from 50 to 60 GWD/t in three different pressurized water reactors (PWRs) were studied. Computer simulation of the magnitude and shape of the various profiles involved five contributing interrelated effects: (1) thermal feedback, (2) radi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTIntramolecular Condensation Reactions of α,ω-Bis(triethoxysilyl)alkanes. Formation of Cyclic DisilsesquioxanesDouglas A. Loy, Joseph P. Carpenter, Sharon A. Myers, Roger A. Assink, James H. Small, John Greaves, and Kenneth J. SheaView Author Information Properties of O…
L'emploi de derives amphiphiles des polyethylene glycols pour la preparation de vecteurs pharmaceutiques colloidaux est etudie. Les micelles preparees a partir de polymeres synthetiques amphiphiles peuvent etre utilisees pour une solubilisation et une stabilisation efficaces de produits amphiphiles therapeutiques ou d…
Low-temperature (400–800 °C) stabilisation of tetragonal zirconia, prepared by a hydroxide gel route and a metal oxalate method, both followed by low-temperature annealing, has been achieved by partial substitution of Zr4+ with Sb3+. XRD and Raman spectroscopy have been used for characterisation of the doped zirconia…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBiomimetic Chemistry of Chromium. Intramolecular Conversion of Hydroperoxochromium(III) to Oxochromium(V)Andreja Bakac and Wei-Dong WangView Author Information Ames Laboratory, Iowa State University Ames, Iowa 50011 Cite this: J. Am. Chem. Soc. 1996, 118, 42, 10325–103…
In this work, bulk Mg2Si has been processed using the PM route. The Mg2Si powders were synthesized by the mechanical alloying technique and were characterized microstructurally and thermally. The mechanical alloying was attained at room temperature by the use of a high ball-to-powder ratio of 33:1. An X-ray diffractio…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSix-Center Concerted Mechanism for Poly(vinyl chloride) Dehydrochlorination. Requiescat in Pace?William H. Starnes,, Joshua A. Wallach, and Hongyang YaoView Author Information Department of Chemistry and Department of Applied Scienc…
The ac conductivity and dielectric behaviors of sodium borovanadate glasses have been studied over wide ranges of composition and frequency. The dc activation energies calculated from the complex impedance plots decrease linearly with the Na 2 O concentration, indicating that ionic conductivity dominates in these glas…
Abstract Palm‐oil‐in‐water emulsions were prepared with mixtures of Tween 40 and Span 40 in various proportions. Stability and droplet‐size distribution of the emulsions were monitored. Interfacial tensions of the palm oil/water interface were also determined in the presence of these emulsifier mixtures. Emulsifying e…
Model liquid crystalline ionomers have been synthesized that consist of low molecular weight linear chains selectively end-capped at one or both end(s) with an ionic mesogenic group. ω- and α,ω-carboxylato and sulfonato polystyrene chains have been prepared by living anionic polymerization and associated with mesogeni…
The low-temperature mechanical relaxations in poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene [poly(aryl ether ether ketone, PEEK], poly(thio-1,4-phenylene) [poly(phenylene sulfide), PPS], and poly(oxy-1,4-phenylenesulfonyl-1,4-phenylene), [poly(aryl ether sulfone), PES] are investigated. All three polym…
The oxide growth rate of zirconium alloys, e.g., Zircaloy-2 and Zircaloy-4, has been proposed to be controlled mainly by the transformation of the zirconium oxide from tetragonal to monoclinic structure at some distance from the metal-oxide interface, leading to cracking. This oxide growth rate model is inconsistent w…
Fine powders in CeO2-ZrO2 system have been prepared from the precipitate mixtures of cerium (III) nitrate solution, zirconium oxychloride solution and an excess amount of ammonia under hydrothermal conditions at 180°C, and their changes in crystal phase and surface area by calcination, sinterability, the crystal phase…
Tungsten(VI) oxo alkoxides and tungsten(VI) oxo alkoxide/β-diketonate complexes are volatile precursors for the low-pressure chemical vapour deposition of tungsten oxide electrochromic films, which are characterized by SEM, XPS, XRD and cyclic voltammetry.
This paper presents the result for the local magnetic properties in a three-phase induction motor model core. The relationship between the magnetic field strength vector H and the magnetic flux density vector B, is obtained through measurements with a special sensor, which utilizes the H-coil method and the double nee…
A reliable calculation of neutron-induced activation of materials requires the inclusion of all kinematically allowed reactions and subsequent reaction chains. While neutron-induced reactions have been sufficiently covered in the past, sequential (x,n) reactions with charged particles x, produced in a first-step react…
ADVERTISEMENT RETURN TO ISSUEPREVErratumNEXTHydroperoxycycloartanes from Tillandsia recurvataGabriela M. Carbrera and Alicia M. SeldesCite this: J. Nat. Prod. 1996, 59, 10, 1002Publication Date (Web):October 22, 1996Publication History Published online22 October 1996Published inissue 1 January 1996https://doi.org/10.1…
The outcome of the reaction of metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with oxyanions is dependent both on the nature of the coordinated metal ion and on the reaction temperature. Metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with relatively electronegative chelated metal ions (CuII, NiII and FeIIICl)react…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTα−γ Disorder in Isotactic Polypropylene Crystallized under High PressureStefano V. Meille, Paul J. Phillips, Khaled Mezghani, and Sergio BrücknerView Author Information Dipartimento di Chimica, Politecnico di Milano, via Mancinelli 7, I-20131 Milano, Italy Department of Materia…