Materials Literature
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Pure aluminum isopropoxide was shown to be a highly active catalyst for the polymerization of ε-caprolactone: the overall kinetics of this polymerization follow a first current order in monomer and a first order in catalyst. Mechanistical studies indicate also that this system operates through a selective acyloxygen c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRotation of phenyl rings in metal complexes of substituted tetraphenylporphyrinsS. S. Eaton and G. R. EatonCite this: J. Am. Chem. Soc. 1975, 97, 13, 3660–3666Publication Date (Print):June 1, 1975Publication History Published online1 May 2002Published inissue 1 June 1975http…
Some of the areas where interfacial protein layers dominate the boundary chemistry are reviewed, and we introduce some nondestructive analytical methods which can be used simultaneously and/or sequentially to detect and characterize the microscopic amounts of matter at protein or other substrates which spontaneously a…
Introduction A method for obtaining interfacial and surface tensions by measuring the shape of a drop of liquid or bubble of gas in a more dense liquid contained in a rotating horizontal tube was first suggested by Plateau's ( 1 ) experiments. Beer ( 2 ) in 1855 considered the problem of the shape of the drop in some…
Abstract The reflection spectra of CaWO 4 and CaMoO 4 single crystals were measured in the region between 4 and 25 eV. The measurements were performed using the electron synchrotron DESY as a light source. Both crystals show very similar spectral features. A relatively sharp, well separated low energy peak is accompan…
Abstract Adsorption isotherms for water vapor, c -spacing and heat of immersion in water of Na- and Ca-montmorillonite were measured at 25°C at various r.h. The amount of water adsorbed as a function of the r.h. increased gradually, whereas the c -spacing increased, and the heat of immersion (per mole of adsorbed wate…
A set of equations has been derived to describe the dynamical motions of small cavitation bubbles in liquids set into motion by an acoustic pressure field. The mathematical formulation takes into account heat conduction inside a bubble and in the surrounding liquid, and the viscosity, compressibility, and surface tens…
1 The effects of adenosine triphosphate (ATP) and adenosine diphosphate (ADP) were investigated on evoked end-plate potentials (e.p.ps) and on miniature end-plate potentials (min. e.p.ps) recorded from muscle fibres of the rat diaphragm and the frog sartorius.2 ATP and ADP decreased the quantum content of the e.p.ps a…
Mechanisms of liquid-liquid phase separation were studied in the binary styrene-acrylonitrile copolymer/poly(methyl methacrylate) system. Evidence is presented which suggests that spinodal decomposition occurs in this system. The Cahn theory provides an interpretation of key experimental results. Both a dispersed, two…
The crystal structures of the ‘cristobalite’ phases of SiO4 and AlPO4 have been determined from X-ray data collected at high temperatures. A model is suggested which gives a much better fit to the data than previously published structures. In this model, the 16 oxygen atoms of the unit cell are statistically distribut…
Some magnetic properties of ACo 2 compounds, where A is a heavy rare earth metal, are shown to be related to properties of YCo 2 . In particular the existence of first order transitions for A=Er, Ho, Dy, but second order transitions for A=Tb, Gd, implies a special temperature dependence of the Landau parameter B which…
The results of a molecular-dynamics study of a simple model of a molten salt are reported. The interionic pair potential which is used consists of the Coulombic term an an inverse-power repulsion which is assumed to be the same for all ions. The structure of the liquid is found to be dominated by charge-ordering effec…
Abstract A method of analysis is given by which the critical strain energy release rate G c for impact tests may be deduced for both Charpy and Izod tests from normal energy measurements. Suitable calibration factors are determined and the method is applied to a range of polymers. Very close agreement is achieved betw…
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Biomaterials are capable of heat transfer-energy transport by virtue of a temperature gradient. In the case of a living biomaterial, the heat transfer capability of the material can be especially important because the state of life may depend upon the maintenance of a specific temperature. All of the three basic mecha…