Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving pseudoanionic polymerization of iε-caprolactone. Poly(iε-caprolactone) free of cyclics and with controlled end groupsAndrzej Duda, Zbigniew Florjanczyk, Andrzej Hofman, Stanislaw Slomkowski, and Stanislaw PenczekCite this: Macromolecules 1990, 23, 6, 1640–1646Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal x-ray structures of the polyoxotungstate salts K8.3Na1.7[Cu4(H2O)2(PW9O34)2].cntdot.24H2O and Na14Cu[Cu4(H2O)2(P2W15O56)2].cntdot.53H2OTimothy J. R. Weakley and Richard G. FinkeCite this: Inorg. Chem. 1990, 29, 6, 1235–1241Publication Date (Print):March 1, 199…
It has been found that the respective substitutions of La and Ni in by small amounts of Zr and Al remarkably improved the cycle life of the alloy anode, scarcely causing a lowering of capacity. In order to clarify the mechanism, the relations between chemical compositions and anode properties for , such as capacity, c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of metals and protons with algae. 2. Ion exchange in adsorption and metal displacement by protonsRay H. Crist, J. Robert Martin, Paul W. Guptill, Jill M. Eslinger, and DeLanson R. CristCite this: Environ. Sci. Technol. 1990, 24, 3, 337–342Publication Date (Print)…
Abstract In this paper, the approach of biodegradation to reduce the environmental impact of plastic wastes is reviewed. The mechanism of biodegradation and the processing and applications of these materials are also discussed in relation to the structural characters of their molecules. The synthetic biodegradable mat…
We discuss the motion of a triple line for a fluid spreading on a flat solid surface in conditions of partial wetting: the equilibrium contact angle θ e is assumed to be finite but small: 0 < θ e [Lt ] 1. We distinguish four regions: (1) a molecular domain of size a (≈ a few Ångströms) very near the triple line, wh…
We report a computer-simulation study of the phase diagram of a system of hard spherocylinders with aspect ratio L/D between 0 and 5. For L/D\ensuremath{\le}3 only isotropic liquid and crystalline solid phases can occur. For L/D=3 a mechanically stable smectic phase occurs, but it is thermodynamically unstable. For la…
A quantitative surface analysis by Auger-electron spectroscopy (AES) or x-ray photoelectron spectroscopy (XPS) requires a series of operations that typically includes instrument setup, specimen positioning, data acquisition, data manipulation, and data analysis. These operations involve a sequence of measurements whic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTracer diffusion at the glass transitionDietmar Ehlich and Hans SillescuCite this: Macromolecules 1990, 23, 6, 1600–1610Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs.org/doi/10.1021/ma00208a…
Intense fluid motions can be generated by the solidification of a binary liquid. This review paper describes systematically some of the concepts involved in the fluid mechanics of solidification. It also presents quantitative calculations for the fluid motion, the rate of growth of solid and the evolution of both the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic and structural studies of sapphyrin, a 22-.pi.-electron pentapyrrolic "expanded porphyrin"Jonathan L. Sessler, Michael J. Cyr, Vincent Lynch, Ellen McGhee, and James A. IbersCite this: J. Am. Chem. Soc. 1990, 112, 7, 2810–2813Publication Date (Print):March 1, 1990P…
Laser granulometry is a rapid method for determination of particle size distribution in both dry and wet phases. The present paper, diffraction technique by laser beams is an application to the granulometric studies of pozzolanic materials in suspension. Theses granulometric analysis are compared to those obtained wit…
This article studies the influence of addition of different quantities of slag and compares this with the addition of fine particled silica sand. The mortar samples (1:3) of 1 x 1 x 6 cm —prepared with a sulphate-resistent portland cement, mixed with a selected slag and with silica sand were subjected to the action of…
The results of a series of laboratory tests, carried out on the bioclastic limestone used in the construction of the Murcia cathedral, are presented in this paper in order to evaluate the efficiency of certain treatment products, that eventually could be applied to that stone for improving their state of conservation.…
Important factors of deterioration which contribute significately to the worrying state of degradation of the petreous materials in the Cathedral of Seville, essentially those used for ornamental objects, are those of anthropogenic nature which through corrosion mechanisms (chemical deterioration) determine the main m…
Cast duplex stainless steels of CF3, CF8, and CF8M grades, containing a wide range of chemical composition and ferrite content, were aged in the laboratory at 270–450°C to evaluate the kinetics and mechanisms of thermal aging embrittlement. Also, CF8 and CF8A steels were obtained from components of boiling and pressur…
Abstract An overview of the importance of and methods available for heat storage in the form of sensible and latent heat is followed by a discussion of the advantages and disadvantages of reversible thermochemical energy storage compared to conventional energy sources such as fuels, i.e. irreversible chemical energy c…
Abstract The classification and nomenclature of chlorites have been critically reviewed. A new classification based on the unified projection system of chemical composition has been proposed in which for the first time all trioctahedral, di-trioctahedral and dioctahedral species are included. The chemical composition…