Temperature and concentration range of the biaxial nematic lyomesophase in the mixture potassium laurate/1-decanol/deuterium oxide
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A spherand azophenol dye: lithium ion specific coloration with "perfect" selectivity
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA spherand azophenol dye: lithium ion specific coloration with "perfect" selectivityTakahiro Kaneda, Shinichi Umeda, Hisako Tanigawa, Soichi Misumi, Yasushi Kai, Hisashi Morii, Kunio Miki, and Nobutami KasaiCite this: J. Am. Chem. Soc. 1985, 107, 16, 4802–4803Publication Dat…
Epoxidation of natural rubber studied by nmr spectroscopy
Abstract Epoxidation of natural rubber with peroxyacids in homogeneous solution (CHCl 3 , benzene) and in latex occurs without main chain fission or isomerization of the cis configuration. There are two possible modes of addition of oxygen to the double bond, which gives rise to diastereoisomers in dyad structures, as…
Reaction of atomic fluorine with silicon
The etch rate of Si with F atoms was measured by the use of F2 microwave plasma over a range of discharge pressures between 2.7×10−2 and 17 Pa. Fluorine atom concentration in the plasma was determined over the same pressure range by means of both gas-phase titration and actinometry using Ar gas. A Si surface etched at…
Corrosion of High Temperature Alloys in the Primary Circuit Helium of High Temperature Gas Cooled Reactors. Part II: Experimental Results
Abstract The reactive impurities H 2 O, CO, H 2 and CH 4 which are present in the primary coolant helium of high temperature gas‐cooled reactors can cause scale formation, internal oxidation and carburization or decarburization of the high temperature structural alloys. In Part I of this contribution a theoretical mod…
Small angle neutron scattering (SANS) of cyclic and linear polystyrene in toluene
Abstract Samples of ring and open chain polystyrene in dilute perdeuterated toluene solution were measured by small angle neutron scattering up to a value of the scattering vector Q = 2 nm −1 . The molar masses 12000 ≤ M /(g/mol) ≤ 22000, the mean square radii of gyration 〈 R 2 〉 and the second virial coefficients A 2…
Synthesis, x-ray crystal structure, and chemical and physical properties of the new linear-chain mixed-valence complex (.mu.-iodo)tetrakis(dithioacetato)dinickel, Ni2(CH3CS2)4I, and x-ray crystal structure of the precursor tetrakis(dithioacetato)dinickel(II), Ni2(CH3CS2)4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, x-ray crystal structure, and chemical and physical properties of the new linear-chain mixed-valence complex (.mu.-iodo)tetrakis(dithioacetato)dinickel, Ni2(CH3CS2)4I, and x-ray crystal structure of the precursor tetrakis(dithioacetato)dinickel(II), Ni2(CH3CS2)4Car…
Phase Characterization of Partially Stabilized Zirconia by Raman Spectroscopy
Raman spectroscopy was used to characterize phase transformations and transition temperatures in partially stabilized zirconia containing ≤20 wt% Y 2 O 3 . The completeness of the martensitic transition and its thermal hysteresis was followed in samples with ≤4 wt% Y 2 O 3 . Between 5 and 12 wt% the spectra indicate a…
Hot Corrosion of Sintered α‐Sic at 1000°C
The hot corrosion of sintered α‐Sic by thin films of Na 2 SO 4 and Na 2 CO 3 was studied at 1000°C in controlled gas atmospheres. Under all conditions corrosion led to 10 to 20 times the amount of SiO 2 formed in pure oxidation after a 48‐h exposure. In addition, small amounts of sodium silicate formed. Melts of Na 2…
Statistical mechanics of pentagonal and icosahedral order in dense liquids
A Ginzburg-Landau model of short-range icosahedral order in bulk liquids, and of pentagonal order in two-dimensional fluids, is used to calculate density correlation functions in these systems. The theory predicts peaks in the structure factor, at positions determined by symmetries of ideal curved-space ``crystals.''…
Cellular Growth During Directional Solidification
During steady state directional solidification of an alloy there is uniform motion of the sample relative to its thermal environment, and the solid liquid interface propagates at constant velocity. In the case of a single phase solid and a planar solid-liquid interface, there exist simple analytical solutions for the…
Critical effects at complete wetting
The approach towards complete wetting is considered for adsorbed liquid layers and for gravity-thinned layers in binary mixtures. These layers are bounded by one or two fluid-fluid interfaces. The thermal fluctuations of those interfaces are studied in the framework of effective interfacial models. Their correlation f…
Hybrid electronic properties between the molecular and solid state limits: Lead sulfide and silver halide crystallites
Tiny single PbS crystals of ∼25 Å diameter are synthesized and studied optically in low-temperature colloidal solutions. Electron microscopic examination shows a simple cubic rock salt structure with a lattice constant unchanged, within experimental error, from the bulk value. These crystallites lack the near infrared…
Differential geometry of crystal structure descriptions, relationships and phase transformation
Article Differential geometry of crystal structure descriptions, relationships and phase transformation was published on August 1, 1985 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 170, issue 1-4).
Jahn-Teller effect of titanium(3+) in octahedral coordination: a spectroscopic study of hexachlorotitanate (TiCl63-) complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTJahn-Teller effect of titanium(3+) in octahedral coordination: a spectroscopic study of hexachlorotitanate (TiCl63-) complexesR. Ameis, S. Kremer, and D. ReinenCite this: Inorg. Chem. 1985, 24, 18, 2751–2754Publication Date (Print):August 1, 1985Publication History Published…
Carlosturanite, new asbestiform rock-forming silicate from Val Varaita, Italy
Carlosturanite is a new rock-forming silicate occurring in a network of veins crosscutting the antigorite serpentinite of Sampeyre in the Monviso ophiolite, Italy. It is light-brown, asbestiform, and the [010] fibers are paralleled by fibrous diopside and chrysotile. The mineral is monoclinic Cm, with a = 36.70, b = 9…
A mathematical model for computer simulation of a direct continuous esterification process between terephthalic acid and ethylene glycol: Part 1. Model development
Abstract A new mathematical model has been developed for the continuous esterification process of terephthalic acid (TPA) and ethlene glycol (EG) with consideration of oligomer characteristics. The liquid weight fraction in the reaction mixture, β, has been selected as a principal parameter in this model. The solubili…
The Effect of Straining on the Transport of Hydrogen in Iron, Nickel, and Stainless Steel
Hydrogen permeation transients for low-carbon iron were measured at room temperature; pure nickel and 17Cr-12Ni austenitic stainless steel (SS) specimens were electrochemically charged with hydrogen. The results for unstrained specimens were compared with those obtained under conditions of continuous stretching. A sli…
The effect of certain processing variables on the form ii to form i phase transformation in polybutene‐1
Abstract Density and wide angle x‐ray scattering techniques were used to study the form II to form I phase transformation in polybutene‐1. The influence of deformation by cold rolling, orientation produced by melt processing (film blowing), and certain additives blended with the homopolymer on the phase transformation…
Scale Formation During Alkaline Flooding
Summary Alkaline chemicals in enhanced recovery operations are used (1) as preflush agents, (2) with polymers and surfactants, and (3) as a principal recovery agent. In these chemical flooding techniques, the precipitation reactions of multivalent hardness ions with alkalis are of particular concern. These reactions m…