Materials Literature
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The changes in the distribution of type III collagen in bovine skin samples of increasing age have been examined. Analysis of layers from bovine skin of various ages has shown that type III collagen was present in all samples and that the proportion of type III collagen present was greatest in the youngest tissues and…
The polarization resistance is often measured to determine the corrosion rate. However, the electrochemical response signal may become distorted by the presence of a corrosion product film on the metal surface. A number of methods have been devised to overcome this difficulty, but these frequently require more sophist…
Abstract The crystal of β′-(BEDT-TTF)2ICl2 has a modified structure of organic superconductor, β-(BEDT-TTF)2I3. Unlike the β-type salt with a two-dimensional(2D) electronic structure, the anisotropy of the intermolecular overlap integrals of HOMO of BEDT-TTF in β′-(BEDT-TTF )2ICl2 suggests the 1D character of the elec…
We discuss the dominant geometrical aberrations of a grazing incidence reflection grating and new techniques which can be used to reduce or eliminate them. Convergent beam geometries and the aberration correction possible with varied groove spacings are each found to improve the spectral resolution and speed of grazin…
Reduction of porous and dense pellets of ferric oxide were carried out with methane in the temperature range of 1073 to 1298K. The reduction pattern was, broadly speaking, topochemical. Volume of pellets increased upon reduction except at 1298K. Extent of carbon deposition in pellets increased linearly with increasing…
We propose a theory for the zero viscosity (η) or infinite temperature (T) intercept (τ0) in the much used quasihydrodynamic expression τ2=τ0+(const)(η/T) for the second rank orientational correlation time (τ2). Whereas we associate the (η/T) term with the integral over the torque–torque correlation function, we attri…
Blue Phases are cubic crystals with large unit cells. In two systems we studied we find experimentally that they orient with their [100] axis parallel to an electric field, E. By analysing the non-linear polarizability, which we describe in terms of the relevant fourth rank tensor, we show that cubic blue phase crysta…
Water and acetate solutions were irradiated under argon by 300 kHz ultrasonic waves. Oxygen was found to be generated besides the products H2 and H2O2, already known. In the presence of acetate the O2 yield decreased rapidly while that of H2O2 decreased more slowly. Succinic acid was found as a product of the attack o…
Compounds of the type Y3[Sb2BrnCl9–n]{Y = Hpy [pyridinium(1+)], n= 0–9; Y = NMe4+, n= 0,3,6, and 9; and Y = Cs+, n= 0,3,6, and 9} have been prepared by a variety of methods and investigated by i.r. and Raman spectroscopy, mass spectrometry, and X-ray single crystal and powder diffraction. Two further mixed halides [Hp…
The thermal unimolecular decompositions of benzaldehyde (BA), crotonaldehyde (CA), and furfural (FA) have been investigated in a flow reactor at very low pressures by modulated beam mass spectrometry above 1040 K. Each reaction proceeds by a different mechanism. Whereas BA decomposes by C(O)-H bond fission CA readily…
An analysis is presented of the thermodynamics of both isothermal and isobaric hysteresis, leading to equations for the calculation of the irreversible entropy production and the loss of free energy in hysteresis cycles of both kinds. The status of ‘apparent’ enthalpies derived from the temperature dependence of isoth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of spin-state interconversion and cooperativity for ferric spin-crossover complexes in the solid state. 6. Magnetic and spectroscopic characterizations of [Fe(3-OEt-SalAPA)2]X (X = ClO4-, or BPh4-)Mark D. Timken, A. M. Abdel-Mawgoud, and David N. HendricksonCite thi…
A polypyrrole film which was electrochemically synthesized in the presence of NaCl showed permeability in electrochemical doping to Cl– and anions of comparable diameter and prevented anions of larger diameter such as EtSO3– from penetrating the matrix.
The silver oxide Ag 3 O 4 contains crystallographically differentiable di‐ and trivalent silver ions, each in square‐planar oxygen environment. From the bond lengths it is concluded that extensive charge equalization takes place between Ag 2+ and Ag 3+ , Ag 3 O 4 is obtained by anodic oxidation of silver salt solution…
On etudie la redeposition de xylanes sur la matrice cellulosique d'une pâte kraft de bouleau raffinee et on determine la nature des forces qui controlent la reassociation. L'etude est basee sur les interactions entre des microfibrilles de cellulose preparees a partir du roseau Arundo donax et le xylane correspondant p…
Abstract The adsorption of Li, Na, K, Cs, and Sr to montmorillonite is studied within the framework of a model that accounts for specific binding as well as adsorption in the double layer region. Variations in solution concentrations of cations due to adsorption are explicitly considered. The experimental data include…
Plipastatins have been isolated as part of a program designed to find inhibitors of porcine pancreatic phospholipase A2. They were purified from fermentation broth of Bacillus cereus BMG302-fF67 and finally separated into four fractions by reverse phase HPLC. The respective fractions were designated as plipastatins A1…
The inrush current associated with energising power transformers can cause interference and damage to other system components. The paper sets out to describe an accurate analytical method which can be used to find the inrush current in any 3-phase transformer in common use. The method is an extension of one previously…
The Diels–Alder Cyclodimerization of buta-1,3-diene to 4-vinylcyclohexene was found to be catalysed by non-acidic zeolites, especially large-pore zeolites such as Na-ZSM-20, Na-β, and Na-Y, and also by carbon molecular sieves.
Abstract The phase morphology and polymer chain orientation in polyethylene‐polycarbonte blends is investigated. A blend with a dispersed polyethylene phase was found to exhibit phase growth under quiescent conditions. Addition of a styrene‐(ethylene/butene) block copolymer controls the phase morphology and prevents p…