Materials Literature
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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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
Abstract X‐ray, differential scanning calorimeter, and density measurements of the degree of crystallinity have been made on ethylene—propylene copolymers which range in composition from 60 to 100 mole‐% ethylene. At 23°C the degree of crystallinity was found to vary from zero to approximately 75 wt‐% in a regular man…