Materials Literature
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A theory of melting is developed based on the dislocation model, in which liquid is regarded as a crystal saturated with dislocations. It is shown that introduction of dislocations is accompanied with lattice dilatation due to lattice anharmonicity. The dilatation makes the dislocation energy per unit length a decreas…
Various Wittig condensation products from the named meso-formylporphyrins are described, together with some transformations of the products. Vilsmeier formylation of the nickel meso-vinyl derivatives causes substitution mainly in the side-chain, and acid cyclisation of the meso-acrylaldehyde products results in the fo…
The Schiff base NN′-ethylenebis(salicylideneimine) and related bases, H2L, react with hydrated lanthanoid(III) halides to give the complexes Ln(H2L)Cl3·nH2O (Ln = La or Ce; n= O—2), Ln2(H2L)3Cl6·nH2O (Ln = La, Ce, Pr, Nd, Sm, Gd, Ho, or Yb; n= O–2). Ln(H2L)2X3·nH2O (Ln = La, Ce, Pr, Nd, Sm, Gd, Ho, or Yb; X = Cl or Br…
A review is presented of the parameters influencing the nucleation of scale from natural waters on a heat transfer surface and its prevention. Little is known about this phenomenon in comparison to subsequent scale growth. The importance of variations in pressure and temperature, which directly change the saturation l…
Zircaloy-steam reaction rate in flowing steam was measured in the temperature range of 900∼1,330°C. The reaction rate measured from the weight gain followed a parabolic law above 1,000°C, but it deviated from the law at 900 and 950°C. Growth rates of ZrO2 layer and ZrO2+ stabilized α-phase were also parabolic above 1,…
The magnetic properties of (Fe 1- x Ni x ) 2 P single crystal compounds were studied by the measurements of magnetization, susceptibility and electrical resistivity. It was found that the Curie temperature takes a maximum at about x =0.1, while the magnetic moment decreases monotonically with increasing x and the comp…
Abstract Polarized Raman spectra of InSe and InS crystals are obtained, the assignment of frequencies is given, and atomic displacements are found at all normal vibrations. In the InSe crystal, force constants of interaction of In‐Se and In‐In atomic planes are evaluated. It is shown that the Raman spectrum of InS has…
Description 15 papers cover a cross section of subjects in an attempt to understand the nature of the atmospheric corrosion process as it affects steel, zinc, aluminum and copper and the listing aspects thereof.
SiO 2 ‐Al 2 O 3 melts containing 42 and 60 wt% A1 2 O 3 were homogenized at 2090°C (∼10°) and crystallized by various heat treatment schedules in sealed molybdenum crucibles. Mullite containing ∼78 wt% A1 2 O 3 precipitated from the 60 wt% A1 2 O 3 melts at ∼1325°± 20°C, which is the boundary of a previously calculate…
The viscoelastic properties of dispersions of microcrystalline boehmite (AlOOH) particles, covering a range of high concentrations (>10% w/w) and containing different electrolytes, have been measured under oscillatory shear with a Weissenberg rheogoniometer. Stable dispersions were highly elastic and often thixotropic…
Ferroelectric phenomena in chiral smectic liquid crystals appearing as a result of the piezo- and flexoelectric effects in these substances are considered theoretically. The dependence of the amplitude and the pitch of ferroelectric helix on the material parameters is calculated in the framework of the phenomenologica…
This paper deals experimentally with the mechanism of an impulsive pressure generated by a collapsing bubble. In a water filled shock tube, an expansion wave and a subsequent compression wave are applied to single, twin and triadic bubbles. The growth, collapse and rebound of bubbles situated at various distances from…
Molybdenum peroxo complexes stabilized by picolinato and pyridine 2,6-dicarboxylato ligands catalyse oxidation of cyclic ketones by H2O2 to lactones and their derivatives; this represents a catalytic analogue of the Baeyer–Villiger reaction.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of endothermic decomposition reactions. 2. Effects of the solid and gaseous productsAlan W. Searcy and Dario BerutoCite this: J. Phys. Chem. 1978, 82, 2, 163–167Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1…
Previous work on the oxidation of chromium is briefly reviewed and the theoretical aspects relating to the determination of surface concentrations of metal oxide films by X-ray photoelectron spectroscopy is discussed. An ultra-high vaccum, high resolution X-ray photoelectron/Auger electron spectrometer was used to obs…
Abstract Because of the generally immiscible nature of polymers, multicomponent polymers or polymeric alloys often exhibit microphase separation. The morphologies of these heterogeneous materials are determined not only by the composition of the system, but also by the processing conditions. The resulting microstructu…
Observations are reported of the behaviour of a smectic-A liquid crystal, 4-n-octyl-4’-cyanobiphenyl (8CB), as it is sheared in two geometries. In the first an initially-homeo-tropic sample is sheared in a planar shear flow cell, and it is observed that the shear creates textures which resemble those caused by dilatin…
A high-resolution structural study of strain-free SrTiO3 in its cubic phase at room temperature shows that the oxygen thermal motion is not very significantly anharmonic.
The first liquid crystal was discovered about a century ago by Reinitzer (1888), who observed that the organic crystal cholesteryl benzoate melted at a temperature of 145°C yielding a turbid fluid which, upon the further addition of heat, became clear at a temperature of 179°C. The turbid fluid was found to exhibit op…
The theory of intermolecular nuclear spin relaxation by translational self-diffusion in liquid crystals is developed. Torrey's treatment of simple liquids is extended and modified for the liquid-crystalline phases by taking into account the anisotropy of the molecular motion, the elongated molecular shape, and the spi…