Materials Literature
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A self-avoiding walk on a lattice, confined between two planes, is examined as a model of the stabilization of a colloidal system by adsorbed polymer. If the walk interacts with neither plane, there is a repulsive force on the planes due to the decrease in the volume of configuration space available to the walk. This…
Abstract Two kinds of glassy crystalline phases (I and III) of cyclohexene were realized by different thermal treatments. The heat capacities of the glassy and the supercooled crystal-I and -III, as well as the stable crystalline phases were measured by an adiabatic calorimeter in the temperature range 12–300 K. The g…
Phase relations have been determined for the system Cu-Sb-As-S between 350 degrees C and 500 degrees C. A new compound, Cu 4 (As,Sb) 2 S 5 , the only quaternary phase synthesized in this study, has not yet been reported as a mineral. It is not stable in either the Cu-Sb-S or Cu-As-S ternary system yet is ideally a ter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew tetrapyrrolic macrocycles. 18 and 20 .pi. Electron homoporphyrinsH. J. Callot and E. SchaefferCite this: J. Org. Chem. 1977, 42, 9, 1567–1570Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissue 1 April 1977https://pubs.acs…
Raman spectra of oriented single crystals of KNO 3 (II) have been recorded at 298 and 77 K. At both temperatures the data are in excellent agreement with the factor group analysis based on the generally accepted Pmcn space group. Additional spectral features observed near room temperature suggest the presence of a sig…
<p>As social networks, shared editing platforms and other collaborative systems are becoming increasingly popular, the demands for proper protection of the data created and used within these systems grows. Yet, existing access control mechanisms are not suited for the challenges imposed by collaborative systems.…
Film breakdown phenomena leading to transpassive high rate dissolution of nickel in nitrate electrolytes were investigated under controlled flow conditions. Current efficiencies for metal dissolution were determined as a function of current density at different p H, temperature, and nitrate ion concentration. Initiati…
Abstract Hellbernsteinfarbene Einkristalle von Na 3 AsS 3 kristallisieren kubisch, a = 8,57 3 Å; d rö = 2,52; d pyk = 2,47 g · cm −3 ; Z = 4. Die dreidimensionale Strukturaufklärung, 428 I 0 ‐Daten (0kl–4kl), MoKα, R = 6,9 und R′ = 7,6% für 428 von 443 möglichen Reflexen, zeigt, daß eine aufgefüllte Variante des NaClO…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe addition of alkyl halides to rhodium(I) dithiolene complexes. The synthesis, structure, and chemical properties of rhodium(III) acyl speciesChien-Hong Cheng, Bruce D. Spivack, and Richard EisenbergCite this: J. Am. Chem. Soc. 1977, 99, 9, 3003–3011Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of multifunctional triarylfluoroethanes. 1. Condensation of fluoro ketonesWilliam D. Kray and Robert W. RosserCite this: J. Org. Chem. 1977, 42, 7, 1186–1189Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissue 1 Apri…
Fission fragment tracks from neutron activation have been used to observe the alpha-emission-induced fragmentation in water of monodisperse particles of 239PuO2 of 0.30 μm geometric diameter into subparticles containing 60–10,000 plutonium atoms. The measured size distribution can be described by a power law relation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of metal oxide catalysts by temperature programmed desorption. 2. Chemisorption of oxygen on copper(II) ion-exchanged Y-type zeolitesMasakazu Iwamoto, Kouji Maruyama, Noboru Yamazoe, and Tetsuro SeiyamaCite this: J. Phys. Chem. 1977, 81, 7, 622–629Publication Date (Pri…
Abstract The kinetics of the reaction of potassium phenyldimethylsilanolate (1) with the series of linear trimethylsilyl‐end‐blocked dimethylsiloxane oligomers and with the series of cyclic dimethylsiloxane oligomers was studied to clear some mechanistic problems of anionic polymerization of siloxanes. The results ind…
We measured the concentration of diatom frustules and amorphous silicon per gram of dry sediment at 5-m intervals in the upper water column (0–40 m), in sediment traps placed at 37 and 60 m below the surface, and in a sediment core. The average concentration of frustules per gram of dry suspended sediment in the water…
The electronic state of high spin MnAs was investigated by using the polarized neutron technique. The experimental results are summarized as follows: i) By analyzing the asphericity of the magnetic form factor with the free ion model, the numbers of electrons in the atomic levels are determined to be (1.0↑+0.3↓, 2.0↑,…
Single crystals of dilute iron alloys of the layer structures Nb${\mathrm{Se}}_{2}$, Ta${\mathrm{Se}}_{2}$, and Ta${\mathrm{S}}_{2}$ have been studied using measurements of magnetoresistance and Hall effect in magnetic fields up to 220 kG. Iron concentrations in the range 0-10 at.% can induce spin-exchange scattering,…
Liquid-crystal optical waveguides may be modulated or switched with high sensitivity by electrooptic, magnetooptic or acoustooptic effects. Such guides, however, have relatively slow response times and relatively high scattering losses so that they currently appear limited to special-purpose applications. A review is…
Abstract Thermal properties of normal and deuterated orthoboric acids were studied through the measurements of heat capacity in the temperature range from 13 to 370 K by using an adiabatic calorimeter and differential thermal analysis curves above room temperature. For both crystals, the heat capacity anomaly was foun…
The decrease in the superconducting transition temperature Tc after fast-neutron irradiation has been measured in V2Hf (C-15 Laves phase), Nb3Al (A-15 phase), PbMo6S7 (Chevrel phase), and SnMo5S8 (Chevrel phase). The samples were irradiated at 6 K and warmed to 300 K during transfer to the measuring cryostat. The Tc o…
Formation of the mixed oxide consisting of RuO 2 and TiO 2 was studied by the DTA/TGA technique and x‐ray diffraction. The coating agent containing RuCl 3 and tetra‐n‐butyl titanate converted into the mixed oxide of RuO 2 and TiO 2 at about 400°C on the Ti substrate, and the reaction was exothermic. The electric resis…