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Abstract The theories of crystal nucleation from solution and the experimental techniques which have been used to study this phenomenon, are reviewed. A more detailed review of nucleation from aqueous solution follows in which attention is drawn to the two types of nucleation, primary and secondary, which characterise…
The production and properties of sheet infrared transmission polarizers of the parallel wire-grating type are discussed. These polarizers are produced by evaporation of a metal conductor on one side of the grooves of an infrared-transmitting plastic film echelette diffraction grating and were first described by Bird a…
The orbital paramagnetic susceptibilities (χ o r b ) in Ni and Cr metals are calculated based on Kubo-Obata's theory and using the energy band calculated by Fletcher in Ni metal, the energy band calculated by Asdente and Friedel, and the one modified by Lomer in Cr metal. With the assumption of rigid band model, χ o r…
The behavior of the water intercalated into kaolin minerals after intercalation of KCH 3 COO has been studied. Halloysite forms a well-known water complex with a 10.1 A basal spacing, whereas kaolinite forms only a partial, and dickite no water complex. Nacrite forms another well-defined water complex with an 8.35 A b…
Abstract Es wird eine Versuchsanordnung beschrieben, in der unter Benutzung einer Vakuumwaage auch in wasserdampfhaltigen Gassen mit Raupunkten über Raumtemperatur die Gewichtsänderung einer Probe kontinuierlich verfolgt weden kann. Für die Oxydationsversuche standen vier reine FeSiLegierungen mit Gehalten von 0,35…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation W. C. Hagel; Electrical Conductivity of Li‐Substituted Cr2O3. J. Appl. Phys. 1 August 1965; 36 (8…
Abstract Das aus Vanadin(V)‐oxid und Phosphorsäure entstehende V 2 O 5 · P 2 O 5 · 4 H 2 O wird – entgegen anderen Auffassungen – als echtes Hydrat, VPO 5 · 2 H 2 O, erkannt, das ein Schichtengitter mit neutralen (VPO 5 ) ∞ ‐ und H 2 O‐Zwischenschichten besitzt. Bei der Entwässerung, die über ein Monohydrat verläuft,…
Herstellung der im Dreistoffsystem Eisen–Stickstoff–Kohlenstoff auftretenden Nitride und Karbide durch Glühen von Karbonyleisenpulver und Reinsteisenstücken in aufstickenden und aufkohlenden Gasen. Die Kinetik der Phasenbildung bei 500 bis 850 °C. Vorgänge beim Karbonitrieren. Beständigkeit der Nitrid- und Karbidphase…
Two-dimensional analogues of spherulites are formed in the pellicle of bacterial cellulose produced by static cultures of Acetobacter xylinum. These spherulites are much larger (sometimes more than 1 cm diameter) than those usually observed in other natural or synthetic polymers. They are due to the radial orientation…
A method of computing demagnetizing factors using a resistance network analog or an electrolytic tank has been devised, and the demagnetizing factors for spheres, rods, disks, and tubes have been computed for the case μ = ∞. When the size of the model on the analog is appropriate, the value obtained for a sphere is wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of Plant Steroids. I. The Origin of the Butenolide Ring of Digitoxigenin1Edward Leete, Harry Gregory, and Eduardo G. GrosCite this: J. Am. Chem. Soc. 1965, 87, 15, 3475–3479Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Publ…
The Raman spectrum of crystalline sulfur dioxide has been recorded at several temperatures between 9 and 185 °K. The main features are in accord with those predicted from the factor group analysis for the known structure of the crystal. Additional peaks were also observed, some arising from isotopic species and lattic…
A rapid and simple method is described for the bacteriological examination of contaminated surfaces. It uses an imprint process with ‘agar sausages’ sterilized in polyamide casings.
Phase relations in the system PbO‐GeO 2 were determined using the quenching technique. The five compounds detected were: 4PbO‐GeO 2 , 3PbO‐2GeO 2 , PbO‐GeO 2 , and PbO‐4GeO 2 . The 3:2 and 1:1 compounds melt congruently at 744° and 799°, respectively. The 4:1 compound melts incongruently at 726°C to PbO plus liquid, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of Thermal Decomposition of Sodium Dithionite in Aqueous SolutionR. G. Rinker, Scott Lynn, D. M. Mason, and W. H. CorcoranCite this: Ind. Eng. Chem. Fundamen. 1965, 4, 3, 282–288Publication Date (Print):August 1, 1965Publication History Published onlin…
Abstract Qualitative and quantitative results from previous studies of the thermoluminescence induced in polyethylene by irradiation are used in an attempt to deduce the main polyethylene electron traps. It is concluded that the most probable traps are the molecular chains themselves, the different degrees of molecula…
The solidification mechanism of melts of monotectic composition is considered. It is shown that important microstructural differences can arise as a result of changes in the relative magnitudes of the interfacial energies between the two liquids and the solid substrate. Conflicting results from previous publications a…
A technique is developed for estimating the rigid-disk partition function near close packing, by evaluating the specific free-energy contributions from correlated motion of larger and larger sets of contiguous particles. In terms of the reduced density θ=A0/A (A0 is the close-packed value of the closed system's area A…
The decay of individual fluorescent transitions excited by monochromatic radiation was measured for most rare earths in hexagonal LaCl3 and other lattices. At 4°K the decay was found to be invariably exponential within the experimental errors; at higher temperatures it could occasionally be represented by several expo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption and Reaction of Coordination Complexes on Silica GelRobert L. Burwell Jr., Ralph G. Pearson, Gary L. Haller, Pueh B. Tjok, and Stephen P. ChockCite this: Inorg. Chem. 1965, 4, 8, 1123–1128Publication Date (Print):August 1, 1965Publication History Published onl…