Materials Literature
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The observed morphologies in concrete microstructure indicates a microbiological deterioration of the material. Some hypothesis are suggested, for the presence of the microorganisms in concrete. Its microstructure has been analysed through specified techniques and some microphotos of the observed morphologies and dete…
This paper describes a study of the penetration capacity of a consolidant frequently used in restoration —ethyl silicate— applied to two monumental stones with different porosities and pore geometries: the Hontoria limestone (Burgos) and the Laspra dolomite (Asturias). The relation between mode of application and pene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature neutron powder diffraction study of copper chromium thiophosphate (CuCrP2S6): observation of an ordered, antipolar copper sublatticeV. Maisonneuve, V. B. Cajipe, and C. PayenCite this: Chem. Mater. 1993, 5, 6, 758–760Publication Date (Print):June 1, 1993Publi…
The helical twisting power determines the pitch of the helical structure produced by introducing a given concentration of chiral dopant molecules to a nematic liquid-crystal phase. By using alternative, twisted, periodic boundary conditions, and measuring the relative chemical potentials of right- and left-handed dopa…
A simple physical model for the difference in correlation energies of ${\mathrm{Si}}_{13}$ in icosahedral and trigonal prismatic structures yields semiquantitative estimates for this difference, which show that it can stabilize the icosahedral structure relative to the trigonal one by as much as 0.2 eV/electron, or \e…
This work studies the thermodynamics of phase transitions of the first kind in current-carrying conductors when these transitions are accompanied by a sharp change of the electrical conductivity. It is shown that the critical current in the normal conductor, i.e., the current that generates the critical pressure, may…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterlamellar covalent grafting of organic units on kaoliniteJames J. Tunney and Christian DetellierCite this: Chem. Mater. 1993, 5, 6, 747–748Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://doi.org/10.1…
Numerical evidence is presented that shows that, for metallic lamellar gratings in TM polarization, the coupled-wave method formulated by Moharam and Gaylord [ J. Opt. Soc. Am. A3, 1780 ( 1986)] converges slowly. (In some cases, for achieving a relative error of less than 1% in diffraction efficiencies, the number of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical applications of the bending beam method. 2. Electroshrinking and slow relaxation in polypyrroleQibing Pei and Olle InganaesCite this: J. Phys. Chem. 1993, 97, 22, 6034–6041Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Publ…
Solid nematic liquids, formed by cross-linking polymer liquid crystals into elastomers, are shown to display novel and complex elasticity. The internal (nematic) direction suffers a barrier to its rotation and this couples to standard elasticity. By considering imposed strains we illuminate this elasticity and also de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of ceria under an oxidizing atmosphere. Thermal analysis, XPS, and EPR studyEdmond Abi-aad, Rafeh Bechara, Jean Grimblot, and Antoine AboukaisCite this: Chem. Mater. 1993, 5, 6, 793–797Publication Date (Print):June 1, 1993Publication History…
Abstract Among the nonmetal nitrides, the polymeric binary compounds BN and Si 3 N 4 are of particular interest for the development of materials for high‐performance applications. The outstanding features of both substances are their thermal, mechanical, and chemical stability, coupled with their low density. Because…
Acetoin is a major extracellular product of Bacillus subtilis grown on glucose and other fermentable carbon sources. The enzymes responsible for the formation of acetoin, acetolactate synthase, and acetolactate decarboxylase are synthesized in detectable amounts only in cells that have reached stationary phase. We hav…