Materials Literature
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It is shown that the best fit of experimental data to the correlation equation as used by Fowkes1 cannot be considered as a criterion of correctness with which the mathematical formula expresses the way of polar interaction at interfaces. Examples of other evidence are given that the polar part of work of adhesion may…
The kinetics of oxidation of arsenic(III) by chromium(VI) has been studied in the temperature range 30–45 °C. The energy and entropy of activation, where a high concentration of arsenic(III) reacts with a low concentration of chromium(VI) to give a 1 : 1 complex, have been evaluated to be 9·1 ± 0·6 kcal mol–1 and –43·…
The molar conductivity of doped MBBA is given by Onsager's equation for electrolytic conduction. The anisotropy of the conductivity is determined largely by the anisotropy of the viscosity of the host material. Experimental values for A° and α are presented.
The overall partition of iodine between air and aqueous solution containing sodium hydroxide is very complicated due to the complex reactions of iodine dissolved in the aqueous phase. The equilibrium constants of the several elementary reactions which influence the overall partition were measured for the range of 10°…
Plasma-sprayed composites, which have good oxidation-resistance and self-lubricating characteristics to 900 C, were developed. The composites are a nichrome matrix containing dispersed glass for oxidation protection and calcium fluoride for lubrication; they are applied to bearing surfaces by plasma spraying layers ab…
Abstract The biomaterials engineer of today has an extremely limited choice of approved metallic implant alloys with which to conduct his studies. There is essentially no incentive for larger companies to initiate basic research in the biomaterials field. New alloys which would have the best chance of developing as bi…
The crystal structure of AgNa(NO2)2 has been determined at 50°C in the paraelectric phase (space group Fddd), and work at 20°C on the ferroelectric phase (space group Fd2d) is in progress. The unit cell contains 8 formula units. The paraelectric structure is partially disordered and each NO2 molecule has two stable po…
Practical rubber formulations are complex mixtures of polymer (s), fillers, plasticizers, curatives, and processing aids. Classical methods exist for determining many of the components of these systems but are too time consuming for routine use in quality control or problem solving activities. Thus a need has existed…
[in Japanese]
Variable-temperature n.m.r. spectra of a series of In, Ru, and Ti complexes of substituted tetraphenylporphyrins show that phenyl ring rotation occurs on the n.m.r. time scale if the phenyl ring ortho-substituents are hydrogen.
Stern-Geary and Tafel polarisation relationships have been obtained for steel in 0·5 M H2SO4 and 1 M HCl containing different concentrations of a wide range of n-alkylquaternary ammonium compounds and thiourea derivatives. The shape of the Stern-Geary polarisation relationship is found to depend on the difference betw…
Abstract
Many mesomorphic compounds undergo decomposition on repeated heating. In the search for compounds which are appreciably stable to heating cycles and which display mesophases over a wide range of temperatures, we have prepared some biphenyl-4-trans-p-n-alkoxycinnamates and have investigated their mesomorphic properties…
Zircaloy-2 having several different microstructures, textures, and compositions has been bombarded with either 5 MeV or 46.5 MeV nickel ions at 300 to 600°C to achieve doses ranging from 0.65 to 87.0 displacements per atom (dpa). Similar material was reactor-irradiated near 320°C to neutron fluences between 0.8 and 3.…
Measurements have been made which show that there is no predictable connection between fibre swelling and the plasticisation of acrylic fibres. The diffusion of dyes into the fibres is controlled by the segmental mobility of the fibrous polymer chains and not by fibre swelling.
The temperature dependence of the lattice constant of SrTiO3, in particular around the 106 K transition, has been measured by using a double-crystal X-ray diffraction method; a relative accuracy of 10−5 is attained. The results are compared with those of EPR in terms of static rotation ø of TiO6 octahedra around [001]…
The anomalous behaviour of powdered barium titanate is confirmed by the use of the formula for mixtures. Systematic measurements of the dielectric properties of BaTiO 3 have been done for two cases: embedded grains and fine-grained pressed powder. The influence of the size and shape of the grains, and of the method of…
20% cold worked Type 316 stainless steel in the form of uniaxially stressed solid rod and pressurized tubes was irradiated at 450°C in the EBR-11. Five irradiated and three unirradiated specimens were examined by transmission electron microscopy to determine the effect of stress on microstructure and possible mechanis…
Four new borates of the formula X 2 Z ( BO 3 ) 2 , with X = Ba , Sr , Ca , and Z = Ca , Mg , are described. Ca 2 Mg ( BO 3 ) 2 is tetragonal, and Ba 2 Mg ( BO 3 ) 2 is hexagonal and isomorphous with the mineral buetschliite. Ba 2 Mg ( BO 3 ) 2 and Sr 2 Mg ( BO 3 ) 2 are related to buetschliite but their diffraction pa…
The presence of a variety of polysilicates, including branched chain species, in aqueous sodium metasilicate solutions has been shown by 29Si n.m.r.