Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational studies of lithium perchlorate in propylene carbonate solutionsD. Battisti, G. A. Nazri, B. Klassen, and R. ArocaCite this: J. Phys. Chem. 1993, 97, 22, 5826–5830Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue…
Polycrystalline SrTiO3 thin films having perovskite structure were prepared by the metallo-organic solution deposition technique on platinum coated silicon and bare silicon substrates. Crack free and crystalline films with uniform composition and thickness were fabricated by spinning and post deposition rapid thermal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStudies of organic di-, oligo-, and polyradicals by means of their bulk magnetic propertiesHiizu Iwamura and Noboru KogaCite this: Acc. Chem. Res. 1993, 26, 6, 346–351Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993…
The size dependence of the resonance Raman spectrum of CdS nanocrystals ranging in size from 10 to 70 Å radius has been studied. We find that while the lowest electronic excited state is coupled strongly to the lattice, this coupling decreases as the nanocrystal size is decreased. We demonstrate that the lifetime of t…
A general methodology is developed for determining the state of stress and the numerical value of the stresses from observed shifts and broadening of optical fluorescence lines. The method is based on the piezospectroscopic properties of single crystals. We present general relationships between the measured fluorescen…
In a previous paper we have studied the changes that have ocurred in the properties related to water access and movement in the stone after the application of water repellent treatments. In this work we compare the weathering resistance of treated and untreated samples by means of sodium sulphate crystallization test.…
It is evaluated the influence of the saccharose as a retarder additive of the cement set in the hydration of the alita and the development of the mechanical proprieties of Portland cement pastes till the age of 70 days. The study has had in consideration additions of saccharose of o to 0.400 % / cement weight, also th…
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…