Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Abstract Using a modification of the vibroscope technique, studies have been made of the sorption kinetics of water vapor in single wool fibers. Small changes in water content, described as interval sorption and desorption, occur in two stages, the first occupying a few minutes and the second many hours (at room tempe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic Polysaccharides. I. Polycondensation of Glucose1Peter T. Mora and John W. WoodCite this: J. Am. Chem. Soc. 1958, 80, 3, 685–692Publication Date (Print):February 1, 1958Publication History Published online1 May 2002Published inissue 1 February 1958https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effect of Various Parameters on the Rate of Formation of Fibers from Collagen Solutions1Howard B. Bensusan and Barbara L. HoytCite this: J. Am. Chem. Soc. 1958, 80, 3, 719–724Publication Date (Print):February 1, 1958Publication History Published online1 May 2002Published…
The cha nges in chemical structure occu ring in pol y (vinyl chloride) as a res ul t of heati ng ina vacu um in t he range 100 to 400 C wer e studied using infrared spectropho to metry. The pri ncip a l changes occ urri ng in t he residue during p yrolysis in a vacuum were the format ion of unsaturated s tructures a n…
Abstract Butadiene copolymers of low molecular weight containing combined acid groups react with metal oxides to give products with unusual properties. The salts, particularly the zinc and cadmium compounds, exhibit plastic flow under slowly applied stresses but are highly elastic on sharp impact; products closely res…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative X-Ray Diffraction AnalysisL. E. Copeland and R. H. BraggCite this: Anal. Chem. 1958, 30, 2, 196–201Publication Date (Print):February 1, 1958Publication History Published online1 May 2002Published inissue 1 February 1958https://doi.org/10.1021/ac60134a011RIGHTS &…
Calcite crystal fragments of known surface area were decomposed in controlled carbon dioxide atmospheres. The decomposing sample was weighed continuously on an automatically recording thermobalance and a rate of weight loss per unit area was obtained. A rate expression involving actual and equilibrium CO 2 pressures a…
The superexchange interaction energy for an ${\mathrm{Fe}}^{3+}$-${\mathrm{O}}^{2\ensuremath{-}}$-${\mathrm{Fe}}^{3+}$ linkage is considered for seven oxides in which ${\mathrm{Fe}}^{3+}$ is the only magnetic ion present, and for magnetite. The superexchange energy may be estimated from the value of $\frac{{T}_{C}}{n}…
The relations between corrosion rates and different forms of sulfide corrosion product are defined by the application of standard and novel x-ray diffraction studies of the corrosion products. Preliminary studies showed that in aqueous-H2S environments, different sulfides affect the corrosion rate of steel in various…
A general Hamiltonian formalism is developed to treat from first principles the motion of electrons in solids, including their mutual Coulomb interaction. By a series of canonical transformations it is shown that under suitable circumstances (which obtain in nearly all solids) plasmons (a quantized collective plasma o…
Abstract Differential dissolution in NaOH solution was investigated as a means of purification of clay. It was discovered that a large quantity of allophane and free alumina and silica were dissolved from clay preparations in 0.5 N NaOH solution by boiling for as little as 2.5 min, provided the ratio of clay weight to…