Materials Literature
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Infrared spectra of thin solid films formed by the condensation of gaseous mixtures of NH3 or ND3 and CO2 at low temperatures were obtained in the region from 4000 to 400 cm—1 at —25°, —78°, and —190°C. Two types of spectra were obtained, depending upon the temperature of formation of the solid. Type I, formed at —78°…
The mechanical and physical properties of pyrolytic graphite are closely related to the structure produced during its deposition. It is shown how various features of the deposited structure can be predicted with some accuracy. These features include the structure of isolated nodules, the influence of various substrate…
The system porous glass saturated with respect to water was studied in the temperature range +2 to -40 degrees. Calorimetric measurements with simultaneous observations on length changes revealed that two kinds of transformations took place at different temperatures below the normal melting point of bulk water. The am…
Abstract The structure of glassy carbon has been investigated by determining the interlayer spacing, crystallite size and disorganized carbon content, and by an analysis of the radial distribution function. Glassy carbon has been found to be a typical non-graphitizing carbon. From the analysis of the first peak of the…
The relation between cloth flexural rigidity and single-fibre flexural rigidity is discussed, and a mathematical formula is derived for the minimum cloth flexural rigidity, neglecting interactions between the fibres; this formula takes account of the twist and crimp in the yarns. An instrument is described which enabl…
Growth of 10 species of unicellular marine algae, representative of seven classes, in an enriched seawater medium was compared with growth in several artificial media. All media were buffered with glycylglycine, which was found to be less inhibitory than tris(hydroxymethyl)aminomethane. Growth of most species in natur…
Fourteen species of motile pennate diatoms obtained from a Georgia salt marsh were cultured under uniform conditions (19°—20°C, 16,000—23,000 lux) in soil—water medium at salinities between 1 and 68 %. All species grew well over at least the range of 10 to 30%; several species grew well over the entire salinity range.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistribution Coefficients for Certain Actinide and Fission Product Chlorides in the Immiscible Salt Systems: LiCl-KAlCl4.R. H. MooreCite this: J. Chem. Eng. Data 1964, 9, 4, 502–505Publication Date (Print):October 1, 1964Publication History Published online1 May 2002Publishe…
Abstract The Theory of Crystallization of bulk linear polymers with chain folding is discussed in terms of recent developments. Specific topics covered are: (a) Rate of crystal growth and size of folded nuclei, (b) theoretical and experimental estimates of the fold surface free energy, and estimates of the surface fre…
By streaming potential measurements, the zero point of charge (zpc) of or‐Al 2 O 3 having a fully hydroxylated surface was found to occur at pH 9.2 ± 0.2. By calcining the alumina at temperatures above 1000°C, the zpc was lowered to about pH 6.7. By aging the calcined material in water at room temperature for a period…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The refractive indices of ADP and KDP have been measured at 25 wavelengths between 2138 Å and 1.529 μ, and at 24.8°C. The measured values have been corrected to give absolute indices. Curves have been fitted to the measured and to the corrected data.The measured and the computed data are given both in air and in vacuu…
The ESR spectra of vanadyl acetylacetonate and tetraphenylporphyrin have been studied in various liquid solvents and frozen glasses. The spectra have been analyzed and the components of the g tensor and of the vanadium hyperfine interaction tensors have been determined, and for the porphyrin the nitrogen extrahyperfin…
Bayerite, fl-AI(OH)3, and boehmite, 7-A1OOH, both with crystallite sizes of some tenths of a micron, were used for this investigation.
Abstract On oxidation of graphitic carbon, acidic surface oxides (or hydroxides in the presence of water) are formed at the boundaries of the carbon layers. It was found that the reaction of oxygen with microcrystalline carbon at 400–450°C yields four groups of different acidities. One strongly acidic group and one we…
The barrier‐layer model previously proposed to explain the anomalous increase in resistivity that occurs in doped BaTiO 3 has been reexamined in the light of data obtained from more recent experiments. The picture thus obtained describes correctly and quantitatively the resistivity anomaly and the frequency and voltag…
The interaction between particles and an advancing solid-liquid interface has been investigated both experimentally and theoretically. For each particular type of particle, a ``critical velocity'' was observed, below which the particles are rejected by the interface, and above which they are trapped in the solid. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Orbital View of Chemisorbed Carbon MonoxideGeorge BlyholderCite this: J. Phys. Chem. 1964, 68, 10, 2772–2777Publication Date (Print):October 1, 1964Publication History Published online1 May 2002Published inissue 1 October 1964https://pubs.acs.org/doi/10.1021/j10079…
Abstract The nature of the electronic-vibrational states of a d9 ion in an octahedral complex is discussed in term s of an adiabatic model in which th e electronic motion follows the nuclear motion exactly. Expressions for the g-values and the hyperfine structure parameters of the e.s.r. spectrum at high and low tempe…
The resistance of VO2 through the semiconductor-to-metal transition has been measured as a function of hydrostatic pressure. The transition has been studied in pure and partially hydrated single crystals of VO2 and in powdered VO2. The temperature of the transition is shifted by less than 0.5 C° by pressures up to 6×1…