Materials Literature
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The kinetics of the catalyzed autoxidation of hydrogen sulfide to sulfur, thiosulfate, and sulfate in aqueous solution has been investigated potentiometrically over the pH range 5-12. The catalytic effects of cobalt(II), nickel(II), and copper(I1) 4,4’,4”,4”'- tetrasulfophthalocyanine have been determined, and differe…
Abstract.- The problem of the stability of gas bubbles in a sound field has been investigated using a model for the motion of a nearly spherical bubble in a slightly viscous liquid. The radial motion amplitude and the pressure amplitude thresholds for the instability of the spherical shape have been obtained by the th…
Measurements of magnetization curves for Fe-Ni Invar alloys have been made at various temperatures between room temperatures and about 450°C. Specimens used were in a sphere shape, which were obtained from the same ingots that the specimens used for the thermal expansion measurements had been taken from. By comparing…
Specially reactive (sr‐) CaO can be produced by decomposing 1‐ to 10‐μm particles of CaCO 3 in vacuum at ∼650°C. Particles of sr‐CaO appear unchanged in dimension from the original CaCO 3 , but have internal pores with surface areas of 92 m 2 /g, more than twice the surface areas reported in a previous study for CaO m…
Abstract A new approach has been proposed to characterize the state of mixing of carbon black-loaded SBR and cis -polybutadiene compounds. The basic concept is that carbon black aggregates, present when the dispersion is imperfect, affect the modulus of the uncured compound more than that of the cured compound. From c…
It is well known that magnetic properties of Goss-oriented silicon-iron are dependent upon external mechanical stress. This paper describes some of the recent work carried out in the UK on the effects of high compressive stress, combined longitudinal and transverse stresses, and also the effects of elevated temperatur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray study of (NH4)7[H2AsW18O60].16H2O: first example of a heteropolyanion containing protons and arsenic(III)Y. Jeannin and J. Martin-FrereCite this: Inorg. Chem. 1979, 18, 11, 3010–3014Publication Date (Print):November 1, 1979Publication History Published online1 May 2002…
Abstract Various approaches to representing the modulus of a semicrystalline polymer as a composite crystal‐amorphous material are applied to the extensive data of Illers on the shear modulus of linear and branched polyethylenes as a function of crystallinity and temperature. It is found that the modulus of linear pol…
The resistivity, Seebeck coefficient, superconducting transition temperature, and upper critical field have been measured in ${\mathrm{Cs}}_{x}\mathrm{W}{\mathrm{O}}_{3}$ for $0.19<~x<~0.30$. In contrast to ${\mathrm{Rb}}_{x}\mathrm{W}{\mathrm{O}}_{3}$, no temperature-dependent anomalies were observed in either…
The Engell‐Stolica potentiostatic method has been used for the kinetic study of the mechanism of pitting initiation of Al 1199. A statistical treatment of the induction time has been developed in order to get meaningful data. Pitting initiation time has been found to be potential‐independent and the linear increase in…
Abstract A systematic understanding of the heat distortion temperature (HDT) of amorphous and semi‐crystalline polymers is possible through a direct correlation with the modulustemperature behavior. For amorphous polymers, the precipitous drop in modulus at the glass transition temperature makes the HDT a well‐defined…
Hydriding and dehydriding kinetics are derived within the framework of the Johnson-Mehl-Avrami equation. Hydriding is considered to be rate limited by hydrogen diffusion through a growing hydride layer, and dehydriding by hydrogen diffusion through a growing metal layer. Incubation time effects due to surface contamin…
The EPR spectra of ${\mathrm{Fe}}^{3+}$ in the three ferroelectric phases of BaTi${\mathrm{O}}_{3}$ could be interpreted on the basis of the Newman superposition model. In the latter, the position of the nearest (oxygen) ligands determines the EPR spectrum. It is found that the ${\mathrm{Fe}}^{3+}$ participates by les…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on strain energiesJames D. Dill, Arthur Greenberg, and Joel F. LiebmanCite this: J. Am. Chem. Soc. 1979, 101, 23, 6814–6826Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs…
We showed previously that fibril formation in vitro from rat tail tendon collagen requires a temperature-dependent initiation (Step 1) following which linear assembly to form thin filaments (Step 2) proceeds as rapidly at 4 degrees C as at 26 degrees C. Step 3, lateral assembly of filaments to form fibrils, is again t…
Abstract Several methods are reviewed for determining compositions in multiphase, reacting mixtures at equilibrium. Wolfe's quadratic programming algorithm is applied and results compared with the Rand method (Dluzniewski and Adler 1972), NASA method (Gordon and McBride 1971) and the George et al. (1976) implementatio…
BaTi${\mathrm{O}}_{3}$ ceramics doped with several iron-group elements up to 2.0 mole% were identically prepared and afterwards annealed at 700\ifmmode^\circ\else\textdegree\fi{}C in ${\mathrm{O}}_{2}$ at 150 bar or in ${\mathrm{H}}_{2}$-${\mathrm{H}}_{2}$O with an oxygen partial pressure of ${10}^{\ensuremath{-}22}$…
The hydriding and dehydriding kinetics of Mg were measured by a method which sweeps through the pressure and reacted-fraction variables. However, a new data-analysis method is employed which permits the derivation of the kinetics at constant pressure, in which form they are much more amenable to interpretation. The eu…
Models based on energy and stress considerations are applied to the phenomenon of spontaneous fracture of materials due to phase transformations and thermal expansion anisotropy. Results are shown to be in reasonable agreement with observations of the grain‐size dependence of such cracking and the effects of internal…
Amorphous films with the compositions MgSiO3 and Mg2SiO4 were condensed by reactively sputtering cathodes with the compositions MgSi and Mg2Si in argon-oxygen atmospheres. Optical constants for these films in the 7-33 micron region were derived by fitting the transmission curves with harmonic oscillators (classical di…