Materials Literature
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The solution properties of complexes formed from azo(benzo-18-crown-6)(1) and polymethylene-α,ω-diammonio cations [H3N+(CH2)nNH3+(2)] have been evaluated through measurements of average molecular weights, viscosity, n.m.r. spectra, and electrical conductance. The trans compound (1) and (2; n= 6) forms a polymeric comp…
Dicopper(II) complexes of 20-membered N4 binucleating macrocycles L1–L3 derived by a cyclic [2 + 2] condensation of diformylthiophene or diformylfuran with the appropriate diamine have been synthesised and characterised by analytical, spectroscopic, magnetic, and X-ray diffraction methods. A pair of bridging ligands,…
The hydrated volumes, Vh, of collagens extracted from various fish species were calculated by using the Simha-Einstein equation, and it was found that the hydration of warm-water fish collagen is greater than that of cold-water fish collagen (halibut). Although the intrinsic viscosities of warm-water fish (bigeye-tuna…
Abstract The mechanism of the thermal oxidation of polyethylene and polypropylene is discussed, based on the observations concerning the oxidation products. The reactions leading to the active radical and molecular intermediate products are given and the differences in the number and structure of the intermediates for…
Some experimental results on the macroscopic spreading of hanging and sessile drops on smooth surfaces are presented. The results for sessile drops nicely corroborate the main aspects of the spreading theory of de Gennes and Joanny. However, it is shown that one assumption of the theory, namely the retainment of a sel…
Tetragonal‐to‐rhombohedral stress‐induced phase transformation was studied by X‐ray diffraction on the ground surfaces of tetragonal zirconia polycrystals and partially stabilized zirconia containing 2.0 to 5.0 mol% Y 2 O 3 prepared by hot isostatic pressing. The rhombohedral phase increased with Y 2 O 3 content and a…
The bond energies of ennea- and octa-aqua-coordinated polyhedra of lanthanoid ions have been calculated on the electrostatic model. Sums of coordination bond energies and Born hydration enthalpies of the aqua complexes predict an exclusive stabilization of the enneahydrate regardless of whether the central metal ion i…
The speed and precision of salt fog contamination testing of insulators is improved using stepwise voltage application to give numerous flashovers in a single test. A similar technique for the clean fog method, which gives comparable results to conventional tests at constant voltage, is proposed. Valuable information…
The validity of using artificial seawater and seawater transported to the laboratory to predict the performance of stainless steel alloys in natural seawater service has been investigated. Crevice corrosion tests on a range of alloys showed damage to be dramatically less in artificial seawater than natural seawater. T…
A scenario is presented to explain the Vogel-Fulcher "law" which describes the slowing down of relaxation processes associated with many glasses: ${\ensuremath{\tau}}^{\ensuremath{-}1}=\ensuremath{\tau}_{0}^{\ensuremath{-}1}\mathrm{exp}[\frac{\ensuremath{-}E}{(T\ensuremath{-}{T}_{0})}]$. It assumes that relaxation pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of electron-withdrawing groups on carbonyl O-oxides. Trifluoroacetophenone O-oxide and hexafluoroacetone O-oxideWolfram W. SanderCite this: J. Org. Chem. 1988, 53, 1, 121–126Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Publish…
Submicron powders of SiC were synthesized at different temperatures (1700°-2000°C) by reaction of a mixed powder of carbon and silicon dioxide prepared by the spray thermal decomposition method. The structural and quantitative analyses of the synthesized SiC were carried out using the Rietveld method on the basis of t…
The intergranular fracture (IGF) in high purity molybdenum and high purity iron are discussed together with the effects of interstitial and substitutional solutes on it.Recrystallized molybdenum is inherently susceptible to IGF. Purification does not improve it. Grain boundary segregation of carbon increases the grain…
Description This volume continues to document progress in composite materials testing. Twenty-seven papers represent the following areas: Analysis; Impact and Compression; Materials Characterization; Failure Mechanisms; Nondestructive Evaluation; and Filament Wound and Woven Composites.
This book considers the technological processes which are involved in the manufacture of coated materials, substances which play an important role in modern industry. The quality of textile materials depends on the fibrous component and fabric manufacturing method and most importantly on the preparation applied during…
Three new pregnane glycosides, named periplocosides A, B and C, have been isolated from the antitumor fraction, which was obtained by subjecting the CHCl3 extract of Periploca sepium to column chromatography over silica gel and eluting with CHCl3-MeOh (10 : 1). Their structures were established by various nuclear magn…
The solubility of hydrogen in liquid pure aluminium has been redetermined for temperatures from 943 to 1123 K and pressures from 67 to 113 kPa (0·66 to 1·12 atm), using an appropriate version of Sieverts' method. The results fit the Van't Hoff isobar and Sieverts' isotherm. Recommended values for the solubility (S) ar…
It was found that pigeon lysozyme binds one calcium ion, as does equine lysozyme. The protein was eluted with equimolar calcium ions from a Bio-Gel P-60 column. The binding constants of equine and pigeon lysozymes were determined to be 2 x 10(6) and 1.6 x 10(7) M-1, respectively, in 0.1 M KCl at pH 7.1 and 20 degrees…
Research Article| April 01, 1988 Diatoms in Antarctic ice cores: Some implications for the glacial history of Antarctica L. H. Burckle; L. H. Burckle 1Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar R. I. Gayley; R. I. Gayley 2Department of…
Long-chain conjugated polymers are described which have electronic transitions with energies of approximately 2–4 eV. Excitation of these transitions by electromagnetic radiation results in strong absorption bands in the visible region of the spectrum and hence a coloured appearance to the polymer. It is shown that th…