Elektrochemie ihre Geschichte und Lehre
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Materials Literature
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Crystal and molecular structure of chloropentacarbonylmanganese
ClMn(CO)5 crystallises in space group Pnma, a= 11·54(2), b= 11·52(2), c= 5·95(1)Å, Z= 4. The crystal structure has been determined by a three-dimensional X-ray analysis based on 653 non-zero reflections measured by counter diffractometry. Refinement by block-diagonal least-squares methods with individual anisotropic t…
Pulse flow reactor studies of the oxidation of methane over palladium catalysts
A kinetic and mechanistic study of the oxidation of methane over palladium and palladium oxide catalysts has been carried out in a pulse flow micro-reactor. The system used was designed especially for the identification of unstable intermediates, but only trace quantities of formaldehyde, carbon monoxide and hydrogen…
Monolayers of polyorganosiloxanes on water
Abstract Linear organosiloxanes with various substituents differ in their spreading velocities and with respect to the film structure formed on aqueous substrates. The material investigated allows a distinction between siloxanes in which the molecules placed on the subphase in helical form become oriented on the surfa…
Magnetic properties of cobalt(II) complexes. Part I. Trigonally distorted octahedral geometries
The theoretical behaviour of principal and average magnetic moments of octahedral cobalt(II) complexes perturbed by spin–orbit coupling and a D3d symmetry crystal-field distortion is presented. Calculations were performed using a complete spin–quartet basis and the crystal-field parameterized by second- and fourth-ord…
Kinetics and Morphological Development of the Sulfide Scale on a Nickel-20 w/o Chromium Alloy in Hydrogen Sulfide-Hydrogen Atmospheres at 700°C
The sulfldation kinetics of a Ni‐20 w/o (weight per cent) Cr alloy exposed to hydrogen sulfide‐hydrogen atmospheres at 700°C have been determined as a function of the sulfur pressure. The morphology and phase composition of the duplex sulfide scale formed as a corrosion product have been investigated. The kinetics app…
Folding chain model and annealing of cellulose
Abstract A folded chain model of cellulose fine structure has been developed, together with a new hypothesis on cellulose “weak links”. Essentially, single cellulose molecules are folded back and forth in the (101) plane to form “platellites” which are the smallest physical and structural unit of crystalline cellulose…
Effect of molecular structure on optical second-harmonic generation from organic crystals
Optical second-harmonic generation coefficients have been measured for several organic molecular crystals. Variations in coefficients for related compounds can be correlated with differences in molecular structure. Highly polarizable aromatic molecules with substituent groups arranged to produce a large static polariz…
The Prediction of Surface Tensions of Liquid Polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Prediction of Surface Tensions of Liquid PolymersL. S. Siow and D. PattersonCite this: Macromolecules 1971, 4, 1, 26–30Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue 1 January 1971https://pubs.acs.org/doi/10.1021/m…
Electron Microscopy Study of the Precipitation Processes in Cu-2 wt% Be Alloy
In order to make clear the precipitation processes in Cu–Be alloy, the structural changes upon ageing of the 2 wt% Be alloy were examined in detail through an electron microscopy in particular by the use of the selected-area electron diffraction technique. The change in electron diffraction patterns with increasing ag…
Chemistry of Saline Soils and Their Physical Properties
An outline of the forces involved in clay particle interaction (swelling and dispersion) is given as a background for the interpretation of the physical behaviour of sodic soils, especially in relation to electrolyte levels. The electrolyte concentration below which appreciable decreases in soil permeability are encou…
Effects of Mn, Si, Cr and Ni on the Solution and Precipitation of Niobium Carbide in Iron Austenite
The influence of manganese, silicon, chromium and nickel on the solubility of niobium carbide in iron austenite have been studied on iron austenites containing various quantities of these elements with niobium by the method of equilibration with methane-hydrogen mixture gas. Manganese and chromium increased the solubi…
Catalysis of radical-recombination reactions in flames by alkaline earth metals
The rate of recombination of hydrogen atoms in fuel-rich hydrogen/oxygen/nitrogen flames containing metal additives has been measured using the lithium/lithium hydroxide method to monitor hydrogen atom concentrations. It is found that the rate of the recombination reaction is accelerated by the addition of alkaline ea…
Stability of Montmorillonites: I. Belle Fourche and Clay Spur Montmorillonites
Abstract Seven samples of montmorillonite from Belle Fourche, South Dakota and one from Clay Spur, Wyoming were equilibrated with various solutions for 3 to 4 years. Most samples did not exhibit a static equilibrium, yet solution compositions moved along or toward definite solubility lines in relation to pH‐⅓ pAl 3+ v…
Tracer study of kinetics and mechanism of hydrolytically induced interfacial failure
Abstract Analysis of the kinetics of hydrolytic desorption of chemisorbed C‐14 labelled polymeric APS (gamma‐aminopropyltriethoxysilane, a coupling agent for glass reinforced epoxy resins) from flat silica or borosilicate surfaces, indicated that the polymer probably consisted of short chains each chemisorbed at one e…
The Crystallinity of Ethylene-Vinyl Alcohol Copolymers
各種組成のエチレンー酢酸ビニル共重合体 (EVAc) をアルカリケン化することにより得られるエチレンービニルァルコール共重合体 (EVA) の物性と構造をX線的に研究し, 次の結果を得た。(1) EVAcは酢酸ビニル含有量約20mol%以上で非晶性となるが, EVAは全組成領域にわたり結晶性である。(2) EVA試料の比重は結晶化度にはほとんど依存せず, 共重合組成とほぼ直線関係にある。(3) EVAの融点はビニルアルコール含有量20mol%付近に極小をもつ連続的曲線で表わされ, 非晶性コモノマーのランダム共重合体に関するFloryの式には従わない。(4) X線的に求めた結晶の形態学的パラメーターから, EVAの結晶構造は三つに大…
Anodic Polarization Behavior of 25% Chromium Ferritic Stainless Steels
Potentiodynamic polarization curves in 1 N H 2 SO 4 and in 1 N HCl were obtained for 25% Cr ferritic stainless steels containing 0–5% Mo and 0–4% Ni. High‐purity alloys and alloys containing the usual commercial levels of C,N, Si, and Mn were investigated. The critical current density was decreased by molybdenum and m…
Crystal and molecular structure and magnetic anisotropy of µ-oxo-bis-[NN′-ethylenebis(salicylideneiminato)iron( III )]–dichloromethane
The crystal structure of [Fe(salen)]2O, CH2Cl2 has been determined by three-dimensional X-ray methods. The crystals are monoclinic, space group P21/c, with Z= 4, and cell dimensions a= 12·44, b= 14·11, c= 19·83 Å and β= 110·4°. Atomic co-ordinates were obtained by Fourier methods and refined by full-matrix least-squar…
Application of Spectroscopy in the Study of Glassy Solids, Part II. Infrared, Raman, EPR, and NMR Spectral Studies
The current review of spectroscopic studies in the glassy state concludes in this part with the consideration of wavelengths in the infrared region and below, Of all the spectral regions, the infrared is the most extensively studied, as can be readily seen from a statistical appraisal of interest, a s judged from the…
Intramolecular environmental effects on the bonding of cyanide and carbonyl
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular environmental effects on the bonding of cyanide and carbonylRichard F. Fenske, Roger L. DeKock, and Allen C. SarapuCite this: Inorg. Chem. 1971, 10, 1, 38–43Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue…