Materials Literature
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Abstract Recent work is presented on the plastic deformation of linear polyethylenes. This work demonstrates the importance of molecular weight and initial morphology in determining the drawing behavior, and shows that by appropriate choice of these two factors a substantial increase in draw ratio and hence stiffness…
A neutron-scattering study has been carried out on magnetite at temperatures just above the Verwey transition point of ${T}_{V}=123$ K. No critical scattering was observed at the (0,0,2) reciprocal-lattice point where the magnetic scattering appeared below ${T}_{V}$ due to the Verwey ordering as previously reported by…
Abstract Pronounced maxima in resistivity–temperature curves have been found at or above T g for a number of amorphous polymers (PS, PMMA, PVC) containing a small percentage of carbon black. The maxima appeared only after a certain period of storage at T < T g or at heating rates substantially higher than those use…
The use of triazole, benzotriazole, and naphthotriazole as corrosion inhibitors for copper is briefly reviewed. The corrosion of copper immersed in acidic, neutral, and alkaline solutions containing these compounds is reported. Triazole has generally been found to be a poor inhibitor, while benzotriazole and naphthotr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigher oxidation level phthalocyanine complexes of chromium, iron, cobalt and zinc. Phthalocyanine radical speciesJ. F. Myers, G. W. Rayner. Canham, and A. B. P. LeverCite this: Inorg. Chem. 1975, 14, 3, 461–468Publication Date (Print):March 1, 1975Publication History Publis…
A reversible photoinduced change in the intermolecular distance has been observed in a well−annealed As2S3 film using a detailed x−ray diffraction technique. This phenomenon is strongly related to the reversible optical absorption edge shift (i.e., photodarkening) by successive cycles of band−gap illumination and anne…
The transport characteristics of a hollow-fiber blood ultrafilter were studied in vitro to provide an understanding of the factors which control solute removal rate and to permit design of a full-scale clinical device. The dependence of ultrafiltrate flux on transmembrane pressure difference, protein concentration, fl…
We explore the problem of electrohydrodynamic instabilities in nematic liquid crystals in the parallel (planar) orientation, in the context of the one-dimensional time-dependent model proposed by Dubois-Violette, de Gennes and Parodi. In the first part of the paper, we solve the equations of motion analytically in the…
New substances of the type of unsymmetrical substituted biphenyls R1[MATH]R2 with R1 or R2 = n-alkyl, n-alkoxy and H-alkanoyl were synthezised. Miscibility measurements in binary systems, texture observation and comparative studies of the trends of the transition temperatures in homologous series yield a classificatio…
Summary The effect of heat treatment in air at temperatures from 200°C to 1000°C of two Cornish biotites has been studied using the M6ssbauer effect in 57 Fe. One of the micas was also studied after heating in vacuo . Progressive changes in the Mössbauer spectra of the materials after heat treatment can be correlated…
The 4'-n-alkyl-4-cyanobiphenyls and 4'-n-alkoxy-4-cyanobiphenyls provide colourless liquid crystal phases which are chemically and photochemically stable. In many cases, the mesophases are produced at quite low temperatures, and indeed two members of the n-alkyl series are nematic at room temperature. Eutectic mixture…
The theory of stress distribution in the insulation of high-voltage direct current (dc) cables is refined by accurately including the effects of heating by the leakage current. The results have specific implications with respect to thermal instability; in particular, a new type of instability is identified. Numerical…
Abstract The deformation of polyethylene in terms of structural processes has been investigated by low‐and wide‐angle x‐ray diffraction in the case of low‐density and, to a lesser extent, high‐density polyethylene. The samples possessed a range of simple textures which enabled the deformation processes to be identifie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of oxyhyponitrite (sodium trioxodinitrate(II)) in aqueous solutionFrancis T. Bonner and Baruch RavidCite this: Inorg. Chem. 1975, 14, 3, 558–563Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue 1 March…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix isolation infrared studies of lithium bondingBruce S. Ault and George C. PimentelCite this: J. Phys. Chem. 1975, 79, 6, 621–626Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue 1 March 1975https://pubs.acs.org/doi/10…
The growth of microscopic voids during the irradiation of metals is due to the preferential drift of interstitials to dislocations, thus allowing the excess vacancies to accumulate at voids. The preference arises from the stronger interaction between a dislocation and an interstitial than between a dislocation and a v…
Cracks in brittle crystals can be lattice-trapped, as dislocations are by the Peierls barrier. Previous estimates of the range of loads within which a crack will not propagate more than one atomic spacing have varied greatly. The author's earlier computer model is extended to examine the effects of varying the shape o…
The experimental data of Mozzi and Warren have boon re-evaluated. One of the numerical constants in the analytical technique has been altered and a continuous analytical distribution function has boen substituted for the discrete or non-analytical distributions of interatomic distances used by Mozzi and Warren. Thoir…
Single crystals of Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 are grown by a floating zone technique. Strontium tantalate belongs to D 2 h 14 or D 2 h 17 space group at room temperature. Ferroelectric phase transition temperature is -107°C. The Curie-Weiss temperature θ 0 and the Curie constant C P are: θ 0 =161 K(=-112°C) and C…
Measurements of H and D diffusion in TiO2, using the isotope exchange technique described in the preceding paper, are reported. Use of this technique resulted in diffusion which was accurately described by Fick’s law with a constant diffusion coefficient, as predicted theoretically, in sharp contrast to single ion dif…