Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA general free volume-based theory for the diffusion of large molecules in amorphous polymers above the glass temperature. I. Application to di-n-alkyl phthalates in PVCKenneth A. Mauritz, Robson F. Storey, and Scott E. GeorgeCite this: Macromolecules 1990, 23, 2, 441–450Pub…
Abstract The effects of intermolecular and intramolecular triplet quenchers and sensitizers on the photochromism of nitrospiropyran have been examined in order to clarify the role of the triplet state (3A*) as well as that of the excited singlet state (1A*). The rates of photocoloration and fatigue were significantly…
The drastic increase in coercivity observed after adding Al in Fe-Nd-B-based magnet alloys seems to originate partially from the occurrence of new Al-stabilized phases in the grain boundary region and at the surface of the Fe/sub 14/Nd/sub 2/B grains. To describe these phases, they were synthesized and their propertie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFischer-Tropsch synthesis: carbon-14 tracer study of alkene incorporationLi Min Tau, Hossein A. Dabbagh, and Burtron H. DavisCite this: Energy Fuels 1990, 4, 1, 94–99Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 Jan…
The phenomena and the propagation processes of DC and AC arcs on the surface of polluted insulators were observed and investigated by means of a high-speed camera. Time-resolved photographs indicate that there is an obvious distinction between DC and AC flashover processes. Based on the alternating character of an AC…
The authors measured FTO (fast transient overvoltages) at various points of a commercial 550 kV gas-insulated substation (GIS) by operating energized disconnectors. Based on the results of these measurements, the possible levels of FTO at various points of the GIS and the probability of occurrence of large levels are…
Colloidal silver and gold particles have been prepared by reduction of aqueous metal salt solutions in inverse microemulsions. The sols are characterized by absorption spectroscopy and electron microscopy. Ultrasound treatment during reduction results in a narrower size distribution of the colloidal particles, as evid…
Propan-1-ol and 2-methylpropan-1-ol were synthesized selectively by the catalytic reaction of methanol and ethanol over magnesium oxide.
In this paper we study the stability of steady state solutions to Doi’s kinetic equation for rigid rod-like polymers in an arbitrary flow field. It is found that for a certain range of concentration, the addition of flow to an isotropic phase can induce a transition to the nematic phase, if the flow rate exceeds a cer…
A time-of-flight neutron diffraction experiment was undertaken on a powder sample of orthorhombic ZrO2 synthesized at 600°C and 6GPa for 30min. The Rietveld analysis for the diffraction data shows that the space group of this phase is Pbca. The refined lattice parameters are a0=1.00861, b0=0.52615, and c0=0.50910nm.
A series of bowl-shaped dodeca-alkanoyloxy macrocyclic derivatives (1) is described; four compounds of this series (1c–g) display a Dho columnar mesophase.
Cystathionine gamma-synthase catalyzes a pyridoxal phosphate dependent synthesis of cystathionine from O-succinyl-L-homoserine (OSHS) and L-cysteine via a gamma-replacement reaction. In the absence of L-cysteine, OSHS undergoes an enzyme-catalyzed, gamma-elimination reaction to form succinate, alpha-ketobutyrate, and…
Abstract An apparatus has been developed for the measurement of thermal conductivity of polymer melts. Based on the transient “line source method,” it is ideally suited to these materials because measurements can be made quickly, before the onset of thermal degradation. Also, little or no sample preparation is require…
Tracer diffusion coefficient of 51Cr in α-iron has been determined by a serial radio-frequency sputter-microsectioning method in the temperature range 885 to 1174 K. In α-iron of the paramagnetic state from the Curie temperature to the α-γ transformation temperature the diffusion coefficient of chromium shows a linear…
We have grown ultrathin films of layered transition metal dichalcogenides (MoSez,NbSe z ) heteroepitaxially on cleaved faces of mica (muscovite).This is the first success in the heteroepitaxial growth between highly heterogeneous layered materials having different crystal structures and lattice constants that differ b…
The ac impedance of poly-[1-methyl-3-(pyrrol-1-ylmethyl)pyridinium]+(poly-MPMP+) as a function of potential has been investigated in acetonitrile solutions. When the polymer is reduced it acts merely as a barrier to the migration of ions to the double layer of the underlying electrode. Thus the ionic conductivity of t…
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The corrosion of alloy 4130 (UNS(1) G41300) steel has been investigated at temperatures up to 400°F in gaseous environments containing varying amounts of H2S and CO2 and in gas-saturated aqueous environments having dissolved chlorides. Thermogravimetric techniques have been used for establishing the kinetics of corros…
Abstract Nickel in elemental form or alloyed with other metals and materials has made significant contributions to our present-day society and promises to continue to supply materials for a demanding future. This article provides a historical overview and physical metallurgy of nickel and nickel alloys. It lists and d…
Abstract This article discusses the composition, characteristics, and properties of the five groups of wrought stainless steels: martensitic stainless steels, ferritic stainless steels, austenitic stainless steels, duplex stainless steels, and precipitation-hardening stainless steels. The selection of stainless steels…