Materials Literature
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Abstract The const rainment of the noncrystalline regions in polyethylene samples with various thermal and mechanical histories has been determined from measurements of the degree to which the activity of para ‐xylene sorbed in the polymer is enhanced relative to its hypothetical value in the absence of crystallites.…
Abstract The temperature dependence of the electrical conductivity and of the Seebeck coefficient of NiO samples with various Ni 3+ concentrations is determined. These samples are obtained from a nickel salt, using various decomposition temperatures. The temperature dependence of the hole concentration, p α , is calcu…
D. Nicholson, Trans. Faraday Soc., 1965, 61, 990 DOI: 10.1039/TF9656100990
The solubilities in the system CaSO 4 –NaCl–H 2 O, at 1 atm pressure and 35°, 50°, and 70°C, have been determined by approaching the solubility curves from both the undersaturation and supersaturation sides. The experimental runs are of long duration, as much as 3 months; these rates should be commensurate with those…
The influence of CaCO 3 on the hydration of 3CaO Al 2 O 3 containing about 90% C 3 A is studied with compacts of their mixtures proportioned to 0, 2.5, 10, 20, and 50 wt% CaCO 3 . The compacts are exposed to H 2 O in liquid and in vapor phase, the attendant expansion being measured as a function of time. Differential…
A hitherto undescribed form of boron can be prepared by subjecting ordinary forms of boron to pressures exceeding about 100 kilobars and temperatures between about 1500 degrees to 2000 degrees C. The new form has a density of about 2.52 g/cm(3) and yields a characteristic DeBye-Scherrer pattern. No large crystals have…
The technique of transmission electron microscopy has been used to study neutron irradiation damage and its behaviour on annealing in molybdenum. Micro-hardness tests were carried out on all specimens before thinning to obtain some indication of the relation between structural effects and the mechanical properties. Th…
The adsorption of 4‐ethylpyridine, 4‐ethylpiperidine, and very low molecular weight poly (4‐vinylpyridines) was studied in cyclohexane solutions containing hydrogen reduced steel powder. Isotherms were obtained for the monomers at 30°C. They show that an amount equivalent to monolayer formation is adsorbed at equilibr…
The adoption of as a new red ‐emitting primary in color television has stimulated investigation of a new class of phosphors obtained by appropriate substitutions in . Substitution of Y 3+ by Gd 3+ and Lu 3+ provides equally efficient hosts for Eu 3 + with no significant spectral differences. Substitution of Y 3+ by La…
Abstract The original fringed micelle model of a crystalline polymer solid assumed two phases, submicroscopical bundled chain crystals embedded in an amorphous matrix. Every macromolecule passed alternately through crystalline and amorphous regions. This model ideally represented the crystallization with highly stretc…
Stress corrosion cracking of α‐brass was studied in nearly neutral ammoniacal copper sulfate. Under the test conditions, this solution produced a thin, adherent oxide film on the brass. Microstructural studies of the fracture surfaces suggest that alternate formation and rupture of this film leads to initiation and pr…
Geometrical shapes of interstices of two types of closest packing of uniform spheres, 1) hexagonal closest packing, 2) face centered cubic closest packing are studied, and the structures of interstices of these two types of packing are used to represent those of the actual foamed elastomers. Equivalent elastic constan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDichloro(phthalocyanino)siliconMichael K. Lowery, Albert J. Starshak, John N. Esposito, Paul C. Krueger, and Malcolm E. KenneyCite this: Inorg. Chem. 1965, 4, 1, 128Publication Date (Print):January 1, 1965Publication History Published online1 May 2002Published inissue 1 Janu…
Lundgren, D. G. (Syracuse University, Syracuse, N.Y.), R. Alper, C. Schnaitman and R. H. Marchessault. Characterization of poly-beta-hydroxybutyrate extracted from different bacteria. J. Bacteriol. 89:245-251. 1965.-Poly-beta-hydroxybutyrate (PHB) from different bacterial genera was studied with regard to its crystal…
Summary Phase-equilibrium relations have been determined at 1000 kg/cm 2 water pressure for compositions within the system NaAlSi 3 O 8 -KalSi 3 O 8 -NaAlSiO 4 -KAlSiO 4 in the area adjacent to the temperature minimum. The composition and temperature of the minimum are Ne 50 Ks 19 Qz 31 and 750° ± 7° C respectively. T…
An electron microscope study on the cell wall of the diatom Cylindrotheca fusiformis was carried out using stereoscopic and sectioning techniques. Material prepared by an enzyme treatment or by a mechanical method showed that the wall consists of two major components: a silica shell and organic material. Vapor of hydr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Study of Adsorption of Ammonia on Dry γ-Alumina1J. B. PeriCite this: J. Phys. Chem. 1965, 69, 1, 231–239Publication Date (Print):January 1, 1965Publication History Published online1 May 2002Published inissue 1 January 1965https://pubs.acs.org/doi/10.1021/j100885a034…
The dependence of the Raman-scattered intensity on exciting frequency is investigated theoretically for the case where this frequency is close to an absorption line or absorption band of the scattering crystal. Both spontaneous and stimulated Raman scattering are discussed. For scattering by electronic levels of impur…
Abstract A theoretical model for interstitial liquid flow in a stationary or moving foam was devised by relating the physical structure of the foam to the physical properties of the surfactant and the foam movement. This was accomplished through a differential momentum balance within a typical capillary (Plateau borde…
The Hamiltonian (Pauli approximation) which gives rise to the spinrotation coupling tensor and the electron spin g tensor is set up for a 2Σ polyatomic molecule. A relationship between the spin-rotation interaction and the Zeeman effect is suggested. The magnitudes of those terms which prevent this relationship from b…