Materials Literature
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Several technologies have been reported for the synthesis of AlN. These are reviewed and described in detail. The processes are classified according to the principle of synthesis, and the AlN product characteristics for each method of synthesis are identified. Only two of the methods reported, direct nitridation and c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of the electron-withdrawing power of substituents on the electronic structure and reactivity in oxoiron(IV) porphyrin .pi.-cation radical complexesHiroshi FujiiCite this: J. Am. Chem. Soc. 1993, 115, 11, 4641–4648Publication Date (Print):June 1, 1993Publication Histo…
Strongly c-axis oriented Pb(ZrxTi1−x)O3 (PZT) thin films with tetragonal perovskite structure (0.45≤x≤0.52) were epitaxially grown on (100)Pt/(100)MgO substrates using metalorganic chemical vapor deposition. Film thickness could be varied by altering the growth time. The electrical properties of PZT thin films sharply…
The authors developed and evaluated a polymer as a contrast agent for magnetic resonance (MR) angiography. The agent consists of a monomethoxy ether of poly(ethylene glycol) covalently attached to poly(L-lysine) (PL), with PL serving as the carrier of gadolinium diethylenetriaminepentaacetic acid (DTPA). Immunogenicit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyaniline plasticized with 1-methyl-2-pyrrolidone: structure and doping behaviorShow An Chen and Hsun Tsing LeeCite this: Macromolecules 1993, 26, 13, 3254–3261Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993h…
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…