Materials Literature
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Abstract UV-visible light absorption spectra of dilute suspensions of standard and commercial montmorillonites (bentonites) and of nontronite, hectorite and pyrophyllite, were studied. All montmorillonites exhibit either an absorption band or a shoulder at a wavelength of 245 nm. The absorption peak for nontronite is…
Abstract From equilibrium silica concentrations over imogolite and boehmite at 100–155°C, the heat and free energy of the reaction (HO) 3 Al 2 O 3 SiOH + H 2 O ⇌ 2AlOOH + Si(OH) 4 have been obtained: Δ H ° r (298·15 K)=38·6 ± 4·1, Δ G ° r (298·15 K) = 26.8 ± 1·1 kJ mol −1 , and hence the heat and free energy of format…
Abstract Als erste Vertreter der Familien der Hexatellurodigermanate und der Hexatellurodistannate wurden K 6 [Ge 2 Te 6 ] und K 6 [Sn 2 Te 6 ] dargestellt und ihre Strukturen aufgeklärt. Für die Ge‐Verbindung wurde die Raumgruppe C 2/c gefunden mit den Gitterkonstanten a = 16,010(8) Å, b = 13,619(8) Å, c = 9,713(5) Å…
Abstract The addition of a 10% talc internal standard to North Pacific sediments allows the relative abundances of clay minerals to be determined both accurately and precisely by X-ray powder diffractometry. Linear programming can be used to generate factors for converting talc-normalized peak areas to weight percenta…
Abstract The molecular process involved in the plastic deformation of crystals of linear polyethylene and isotactic polystyrene by necking was investigated by transmission electron microscopy (TEM). The results for the draw ratio, the height, and the shape of the neck and the molecular structure of the deformed materi…
The chloride corrosion behavior of five silver-palladium dental casting alloys was investigated in a 1% NaCl solution through the use of electrochemical hysteresis technique. The corrosion mechanism has been interpreted in terms of the microstructure of these alloys and their possible electrochemical reactions.
High-purity iron single crystals of ·2 mm diameter with a residual resistivity ratio of ∼3500 have been produced by the strain-annealing method from a poly-crystalline rod purified by zone refining in hydrogen gas and in vacuo. These single crystals could be deformed at helium temperature up to several percent strain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA manganese phthalocyanine-dioxygen molecular adductA. B. P. Lever, J. P. Wilshire, and S. K. QuanCite this: J. Am. Chem. Soc. 1979, 101, 13, 3668–3669Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs…
Five new oxidpnictides have been prepared and structurally characterized. They crystallize in the tetragonal system, I4/mmm, with the following constants: Sr 2 Mn 3 As 2 O 2 : a = 416 ± 1 pm, c = 1884 ± 4 pm, c/a = 4.529, Ba 2 Mn 3 As 2 O 2 : a = 424.8 ± 0 5 pm, c = 1977 ± 3 pm, c/a = 4.654, Sr 2 Mn 3 Sb 2 O 2 : a = 4…
Abstract The hydroxyl orientations in 31 dioctahedral and trioctahedral 2:1 phyllosilicate structures have been determined by electrostatic energy calculations. These structures included micas, brittle micas, and other related minerals exhibiting ordered as well as disordered cation distributions. The dioctahedral mic…
The low temperature specific heat was measured in βMn metal and alloys with V, Cr, Fe, Co and Ni. The large enhancement of the electronic specific heat due to spin fluctuations is observed. The coefficient of the electronic specific heat, γ, changes with the excess number of the d electrons per atom in the alloy, Δ n…
The relative performance characteristics of thick-film Pd/Ag conductors (0-34% Pd) for dielectric crossover structures in hybrid microelectronic circuits are described. The materials were supplied from Du Pont and Engelhard. The experiments involved waterdrop (WD) tests and temperature-humidity-bias (THB) tests at 90°…
The compatibility of blends of polybutylene terephthalate and polyethylene terephthalate has been studied. A single glass transition for the blend is observed which varies with composition, suggesting that the components are compatible in the amorphous phase. Studies of the effects of time and temperature in the melt…
A freshwater Spirillum sp., which apparently belongs to a niche of low nutritional status (Matin & Veldkamp, 1978), accumulated poly-beta-hydroxybutyric acid (PHB) during lactate-limited growth in continuous culture. The PHB content varied in a complex manner with the dilution rate (D), but was greatest at the lowest…
The Sm-Co magnet has superior and convenient magnetic properties as compared with conventional ones used hitherto in prosthesis, and even very small pieces can provide the force necessary in dentistry. Also, the magnet has high corrosion resistance and is innocuous to tissues. Therefore, it can be used as a dental mat…
Abstract The ductile‐brittle transitions of nylon‐66 compositions were studied by Izod and falling weight tests. Samples included unmodified and impact modified compositions. Brittle breaks did not occur in the toughest resin with changes in rate of loading, notch radius, thickness, or distance and orientation to the…
Asymmetric syntheses of non-functionalized oxiranes can be accomplished with the aid of the new optically active MoVI peroxo complex (1). Thus e. g., propene, 1-butene, and 3-methyl-1-butene were epoxidized to the corresponding R-oxirane in ca. 29, 31, and 16% optical yield (enantiomeric excess). Previously, only acti…
Phase diagram and thermodynamic data for twenty ternary copper‐silver‐X alloy systems—where X represents Al,Au,Cd,Fe,Ge,In,Mg,Mn,Ni,P,Pb,Pd,Re,S,Sb,Se,Sn,Te,Ti or Zn—were compiled and critically evaluated. Of the twenty ternary systems, thermodynamic data are available for only the seven systems containing Au,Pb,Pd,S,…
We describe a novel room-temperature detector for the wavelength range 10–1000 μm. This detector consists of a thin bismuth bolometer film with dimensions much smaller than a wavelength. The small size of the detector results in reduced NEP and faster response. A video NEP of 1.6×10−10 W/Hz1/2 is obtained at 119 μm, r…
Abstract Chemical and physical treatments of cotton cellulose have been studied in order to elucidate the relationship between the degree of crystallinity of cellulose and the susceptibility of cellulose to cellulase. Cotton cellulose powder was treated with the following solvents: 60% H 2 SO 4 , Cadoxen, and DMSO‐ p…