Materials Literature
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The formation of particulate TiO2 has been studied by the addition of small quantities (10–5–10–3 mol fraction) of TiCl4 vapour to a lean CO + O2+ N2 flame with a maximum temperature of about 1400°C. Measurements of TiCl4 concentration have been made as a function of height (residence time) by u.-v. absorption spectro…
For certain conditions, alloys composed of metals of different nobility anodically dissolve without noticeable preferential dissolution of the less noble metal (simultaneous dissolution). In principle, an induction period of disproportionate dissolution of the less noble metal should precede simultaneous (nonselective…
Pitting potential measurements were performed by potentiodynamic scanning at 200 mV/hr in and in , each saturated with nitrogen. Over the entire temperature range studied, 1°–70°C, molybdenum additions up to the limit of solid solubility caused a continuous increase in the pitting potentials of 18% Cr ferritic stainle…
Partially ordered polyarnide-hydrazides were produced by the poly condensation of diacid chlorides with aminobenz-hydrazides, the order that results being a consequence of the considerably more rapid reaction of a diacid chloride with the hydrazide group in competition with the aromatic amine group of the aminobenzhyd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of .alpha.-pyrone in solid argonRichard G. S. Pong and James S. ShirkCite this: J. Am. Chem. Soc. 1973, 95, 1, 248–249Publication Date (Print):January 1, 1973Publication History Published online1 May 2002Published inissue 1 January 1973https://pubs.acs.org/doi…
A detailed investigation has been made regarding the variation in internal friction and Young's modulus with temperature in manganese–copper alloys containing 11.74–26.08 wt.-% Cu. It was confirmed that the transformation temperature for the fct → fcc reverse martensitic transformation in quenched specimens is reduced…
The effect of terminal alkyl and alkoxy substituents on the mesomorphic properties of p-alkylphenyl p-alkylbenzoates, p-alkylphenyl p-alkoxybenzoates, p-alkoxyphenyl p-alkylbenzoates, and p-alkoxyphenyl p-alkoxybenzoates was studied. It was found that, with relatively few experiments, one could make reasonable predict…
SummaryThe mechanism by which coloured films form on stainless steel when immersed in a solution containing chromic and sulphuric acids at 70°C has been studied. The variation of the potential of the steel with time of immersion in 2·5M CrO3 + 5M H2SO4 was measured and the weight change of the metal and the thickness…
Binary chromium(IV) alkyls, CrR4, R = CH2CMe3, CH2CMe2Ph, CH2CPh3, and CH3, have been prepared and characterised by electronic, i.r. and e.s.r. spectroscopy. The electronic and magnetic properties of tetrahedral chromium(IV) compounds are discussed.
The E.S.R. spectrum of an electron irradiated, type IIa diamond has been studied after it had been annealed at various temperatures up to 1400°C. Six sets of lines were identified following anneals in the temperature range 700°C–1000°C. They all arose from centres with ⟨110⟩ symmetry and a spin of 1. The centres are t…
The results of wide- and small-angle X-ray studies on bulk vulcanizates of natural rubber are described. At room temperature no discrete X-ray peaks occur at small angles, even for highly strained (700%) specimens for which a significant degree of crystallinity is present at room temperature. Below the isotropic melti…
Abstract A battery of characterizational tests have been performed on a systematically varying series of segmented polyurethanes. These tests include small angle light scattering (SALS), small angle and wide angle x‐ray diffraction, optical and electron microscopy, and mechanical testing (both tensile and dynamic). Ob…
A theory is developed to describe the shape of a long thin elastic film peeling from a rigid substrate under a constant load. The theory is verified by static measurements of spring steel strip and by slow peeling experiments using rubber and paint films. Extension of the theory to the case of viscoelastic peeling fil…
Abstract not Available.
A detailed study has been made of the deformation modes which operate in polyethylene single crystals when drawn on a Mylar substrate. The orientation relationships associated with the stress-induced twinning and monoclinic phase transformations have been determined by electron diffraction and compared with prediction…
The weak-beam technique of electron microscopy (Cockayne, Ray and Whelan 1969) has been used to image the fourfold dissociation of superlattice dislocations in a DO3-ordered Fe-26 at.% Al alloy. Values of 77±12 and 85±16 erg cm-2 have been obtained for the first and second nearest-neighbour antiphase boundary energies…
Exchange splittings of $3s$ electrons in $3d$-group transition-metal compounds have been obtained by x-ray photoemission spectroscopy. The data for the difluorides exhibit the expected dependence on $d$-shell spin and $s$-electron binding energy, and yield a $3s$ splitting of 2.6 eV/spin. Data on a series of manganese…
At a late stage in sensescence cucumber cotuledons lose fresh weight rapidly; at the same time there is an increase in apparent free space and large quantities of electrolyte leak out when discs of cotyledon tissue are floated on water. It is concluded that tonoplast and plasma membrane become leaky at this time. Phos…
Martensitic transfromation in TiNi alloys of the near-equiatomic composition has been studied by utilizing electron microscopy and diffraction under various thermal treatments. It has been observed that the martensitic transformation is associated with the variants of the product. Two orientations of the martensitic p…
The usual way to align a liquid crystal layer homogeneously is rubbing the substrate, wherby micro-grooves are produced. We investigated the orienting influence of micro-grooves of variable density using different substrate materials and different liquid crystals. Some theoretical considerations concerning the alignin…