Materials Literature
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Abstract The general method of obtaining the partition function and thermodynamic characteristics of polymer chains near an adsorbing surface, simulated by random walks on a lattice, is developed. The method takes into account the effect of short‐range interactions in polymer chains, in particular, the chain stiffness…
Abstract A nucleation theory for strain‐induced crystallization is formulated to explain and to predict the effects of molecular strain on crystallization kinetics and crystallite size. Unlike any current theories that have based their formulations on some assumed extended‐chain line nuclei or folded‐chain crystals, t…
ABSTRACT The effects of temperature and the presence of oxygen and reducing agent on the thermal stability of two naturally occurring labile folates were investigated Microbiological assay of samples heated from 49–100°C for various lengths of time revealed that the loss of 5‐methyltetrahydrofolic acid in aqueous solu…
The equation relating current to voltage for an electrode under charge-transfer control has been solved for a sinusoidal modulation of the electrode potential. The rectified Faradaic component has been obtained, so as to derive its value as a function of the Tafel parameter and of the amplitude of the modulating volta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttachment of organic groups to heteropoly oxometalate anionsFrans Zonnevijlle and Michael T. PopeCite this: J. Am. Chem. Soc. 1979, 101, 10, 2731–2732Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Viscosity of Poly(dimethylsiloxanes) with Random BranchesEnrique M. Valles and Christopher W. MacoskoCite this: Macromolecules 1979, 12, 3, 521–526Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979http…
Aqueous oxidation of the nickel‐based alloy Inconel‐600 has been studied using x‐ray photoelectron spectroscopy as the primary means of determining the elemental composition and chemistry of the surface films produced. Composition profiles of the entire film thickness back to the metal‐oxide interface were determined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrans-cis photoisomerization of the stilbenes and a reexamination of the positional dependence of the heavy-atom effectJack Saltiel, A. Marinari, David W. L. Chang, James C. Mitchener, and E. Dennis MegarityCite this: J. Am. Chem. Soc. 1979, 101, 11, 2982–2996Publication Dat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetamagnetic properties of one-dimensional decamethylferrocenium 7,7,8,8-tetracyano-p-quinodimethanide (1:1):[Fe(.eta.5-C5Me5)2]+.cntdot.(TCNQ)-.cntdot.G. A. Candela, L. J. Swartzendruber, Joel S. Miller, and M. J. RiceCite this: J. Am. Chem. Soc. 1979, 101, 10, 2755–2756Pub…
It is shown that microchannel plates (MCPs) tend to act as if they were discrete stage electron multipliers with a fixed number of stages or dynodes if a plausible assumption is made regarding the behavior of the secondary electrons emitted from the semiconducting sidewalls of tubular channel electron multipliers unde…
γ irradiation of vitreous silica normally leads to the formation of a large number of optical defects and to an increase in density. Irradiation of hydrogen-impregnated vitreous silica suppresses the formation of these optical defects, but does result in the formation of large quantities of bound hydroxyl and hydride.…
Abstract The variation of solution Al 3+ activity with pH, the effect of suspending salt solution cation on Al 3+ activity, and the buffering intensity were determined for salt solution suspensions of three soil samples and an Al substituted peat that contained one equivalent of Al 3+ for each equivalent of carboxyl g…
A new high pressure volumetric technique, which employs a fine glass capillary as joint sample chamber and pressure vessel is described. Because of the small samples used, it is suitable for supercooled liquid studies. The compressibilities κT of water and of D2O have been determined over the applied pressure range 0.…
The oxidation state of iridium ions in an oxide film, grown electrochemically on an Ir metal reflector electrode, can be rapidly and reversibly modulated according to the electrochromic redox reaction Ir OH n transparent ⇄ IrO x OH n − x blue ‐ black + x H + + xe By suitable choice of electrolyte composition and poten…
In this paper we reinterpret the magnetic-susceptibility data and present and discuss specificheat data on MEM-${(\mathrm{TCNQ})}_{2}$ in terms of a spin-Peierls transition theory. We find that the data can be described reasonably well by a mean-field spin-Peierls transition theory which suggests that at low temperatu…
Abstract Fourier‐transform infrared (FTIR) studies of the poly(ϵ‐caprolactone) (PCL)–poly(vinyl chloride) (PVC) blend system are presented. The results indicate that there are specific interactions between the PCL and PVC in both the molten and solid states which could be responsible for the apparent compatibility of…
Calcium ion plays an essential role in many biological processes. The environment about Ca 2+ may be probed by substitution of tripositive lanthanide ions, Ln 3+ . Ca 2+ proteins fall into two broad classes: those that are inhibited by Ln 3+ substitution and those that are not. It is suggested that although Ca 2+ unde…
Microstructural development during aging of supersaturated solid solutions of cubic ZrO, stabilized with MgO was studied, principally using transmission electron microscopy. The starting materials were commercial Mg‐PSZ, solution‐annealed at 1850°C for 4 h. Optimum mechanical properties are obtained at aging temperatu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman and ultraviolet spectroscopic characterization of molybdena on alumina catalystsHelge. Jeziorowski and Helmut. KnoezingerCite this: J. Phys. Chem. 1979, 83, 9, 1166–1173Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue…
A rigorous theoretical formalism describing the diffraction of a P polarised plane wave by a perfectly conducting double grating is presented. The use of such structures as long wavelength Fabry-Perot interferometers is investigated and the individual effects of the design parameters are determined. In particular, it…