Materials Literature
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The thermodynamic properties of amorphous phases of linear molecular chains are obtained from statistical mechanics by means of a form of the quasi-lattice theory which allows for chain stiffness and the variation of volume with temperature. A second-order transition is predicted for these systems. This second-order t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Graphitic OxideWilliam S. Hummers Jr. and Richard E. OffemanCite this: J. Am. Chem. Soc. 1958, 80, 6, 1339Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958https://pubs.acs.org/doi/10.1021/ja01539…
Precise measurements of lattice expansion of high-purity copper held near 10\ifmmode^\circ\else\textdegree\fi{}K during deuteron bombardment were made using a rotating single-crystal method. An expansion of (4.1\ifmmode\pm\else\textpm\fi{}0.2) \ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}21}$ per 7-Mev deute…
Possible elementary excitations in solids are studied with the aid of the general theoretical approach developed in the preceding papers of this series. Particular attention is paid to the basic theoretical justification for the individual-particle-like elementary excitations ("effective" electrons). It is concluded t…
Small-signal dielectric constant measurements were made on single domain crystals of BaTi${\mathrm{O}}_{3}$ from 25\ifmmode^\circ\else\textdegree\fi{}C to 170\ifmmode^\circ\else\textdegree\fi{}C at 24 kMc/sec. A typical Curie behavior was observed with a dielectric constant ${\ensuremath{\epsilon}}_{11}$ of about half…
Abstract Part of the research on the structure, synthesis, and properties of clay minerals in Yugoslavia is reviewed with particular reference to the following problems: (a) attempts to synthesize halloysite from solutions under normal conditions; (b) structure and properties of synthetic montmorillonites; (c) dehydro…
Abstract Protocatechuic acid which is available from tree sources was converted to a hydroxymethyl‐1,4‐benzodioxan carboxylic acid by reaction with epichlorohydrin. This hydroxy acid was condensed by heating under vacuum to from a linear polyester which was converted to fibers by melt spinning. By applying stretch dur…
The general features of nitrite inhibition and the mechanism of its action, so far as known, are discussed. Particular cases of nitrite inhibition in hydraulic fluids, cutting fluids, storage fluids, fire-extinguishing plant, canned goods, automobile cooling systems and marine turbine systems are then reviewed. The ad…
Zirconium and titanium inhibit solution mass transfer of steels by liquid bismnuth, mercury, and lead. It is shown that in bismuth and mercury, these adsorb on the surface of the steels and subsequently react with nitrogen and possibly carbon from the steels to form inert, adherent surface layers of ZrN, TiN, or TiN +…
The adsorption isotherms of water vapour on a wide range of commercial secondary cellulose acetate and cellulose triacetate fibres have been measured at 22°C. Conversion of cellulose acetate flake into fibres causes a drop in sorption, but otherwise the sorption is almost unaffected by the filament denier, conversion…
Neumessung der Konstanten bei der Verzunderung von Elektrolyteisen von 480 bis 1080° C in Sauerstoff bei Atmosphärendruck unter Verwendung eines Fallbügelreglers zur Vermeidung von Übertemperaturen. Vergleich der Ergebnisse mit Angaben aus dem Schrifttum. Bedeutung der Temperaturen von 566, 579, 616, 755 und 910° C fü…
Abstract Melting points of three polyamides, four polyesters, and their mixtures with diluents have been determined by application of dilatometry to observe the latent volume change during gradual melting extending over many days in each case. Heats of fusion were calculated from the depressions of the melting point b…
Dislocations introduced into single crystals of silicon by plastic bending at an elevated temperature have been studied quantitatively by the etch-pit technique. The average etch-pit density after deformation is approximately two to three times higher than the calculated dislocation density. Prolonged annealing of the…
The diffusion of cobalt and chromium in sintered samples of CoCr2O4 has been measured in the temperature region 1400°C—1600°C where it is believed that bulk diffusion predominates. The diffusion can be represented as DCo=(10—3) exp(—51 000/RT), DCr=(2) exp(—70 000/RT).
ABSTRACT The clay mineral assemblage in an area of active deposition is dependent largely on the character of the source area. This conclusion is based on a study of the clay mineralogy of sediments of the lower Mississippi River, the active delta region, the St. Bernard Sub-delta, and the Mississippi Sound-Mobile Bay…
Abstract A study has been made of the adsorption by varieties of silica of a number of aromatic compounds, (chiefly dyes), from aqueous solution. Basic dyes are adsorbed by ion‐exchange in the form of a monolayer of cationic micelles, the amount adsorbed being considerably in excess of that required to cover the surfa…
Abstract Samples of a montmorillonite, a mixed-layer mineral (mica and montmorillonite) “illite”, kaolinite, and halloysite were immersed in 50 ml sea-water for 10 days, and additional samples of the first three were immersed for 150 days. The exchangeable cations were determined both before and after treatment. It wa…
Superexchange interaction in the MnO crystal is studied by using the Heitler-London picture including overlap. Mechanisms proposed by Slater, Kramers and Anderson, and Goodenough are developed on the same basis. The energy difference between the antiparallel spin state and the parallel spin state is computed numerical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Copper ManganiteA. P. B. Sinha, N. R. Sanjana, and A. B. BiswasCite this: J. Phys. Chem. 1958, 62, 2, 191–194Publication Date (Print):February 1, 1958Publication History Published online1 May 2002Published inissue 1 February 1958https://pubs.acs.org/…
Abstract n ‐Amyltriethoxysilane and phenyltriethoxysilane were hydrolyzed in organic solvents in the presence of acidic or basic catalysts. The bulky substituents allow relatively large amounts of low‐molecular‐weight partial hydrolysis products to be isolated and stabilize the silanol functions present against furthe…