Materials Literature
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Iodixanol is a new nonionic, dimeric contrast medium. With the addition of 18 mmol/l Na+ and 0.3 mmol/l Ca++ to iodixanol 320 mg I/ml a plasma-isotonic solution was obtained. The purpose was to evaluate the suitability of iodixanol for use in cardioangiography by determining the diagnostic efficacy, patient tolerabili…
At the invitation of the Brazilian government, the authors conducted a multidisciplinary field study in Goiania, Brazil, 3 1/2 years after an accident involving 137Cs, a radioactive cesium isotope. They compared subjects exposed to low levels of ionizing radiation, subjects who experienced anticipatory stress from fea…
The rust layers formed on weathering and mild steels by atmospheric corrosion in an industrial region for a quarter of a century have been characterized by means of observation of the reflection behaviour of polarized light, scanning electron microscopy, infrared transmission, X-ray diffraction and Raman spectroscopy,…
A series of sulfonated, water-soluble, phenyl-substituted porphyrins has been prepared, containing halogen or alkyl groups in the ortho, di-ortho or para positions. While the para-substituted compounds exhibited monomer–dimer behaviour, all the ortho and di-ortho substituted porphyrins were monomeric in aqueous soluti…
Quasicrystals uncovered in aluminium alloys are still a matter of intense research regarding their structure which does not obey the rules of classical crystallography. Today, they also offer a new challenge in relation with their specific electronic properties and surprising mechanical behaviour. These properties are…
This article provides a review on the experimental aspects of the alignment of nematic liquid crystal (NLC) in the pretilted homogeneous form in the sandwich cells; most of the contents of this paper are the results of research done by the authors in these few years. For simplicity and convenience, we used nematic liq…
The formation of elemental maps in an electron microscope with an imaging energy filter is discused quantitatively. The chemical information is obtained by use of inner-shell excitations. As the relevant cros-sections are very small, the detection and resolution limits are governed by the signal-to-noise ratio. Imagin…
The polaron concept is used to describe trapping of charge in a dielectric medium. It is shown that trapping is associated with defects identified as being due to a local decrease of the electronic polarizability. The polarization energy around a charge is estimated, using a self-consistent calculation of the local fi…
Two approaches were postulated for improving the stability of porous texture of titania membranes: (1) retarding the phase transformation and grain growth; (2) avoiding the phase transformation. Based on the second approach, rutile membranes were made directly from a rutile sol, prepared by the precipitation of titani…
Kim Orchard, Gillian E. May; An EMSA-based method for determining the molecular weight of a protein - DNA complex, Nucleic Acids Research, Volume 21, Issue
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-liquid equilibria of water + acetic acid + phthalic esters (dimethyl phthalate and diethyl phthalate) ternariesUmur Dramur and Besir TatliCite this: J. Chem. Eng. Data 1993, 38, 1, 23–25Publication Date (Print):January 1, 1993Publication History Published online1 May…
The formation of ferroelectric liquid crystals by simple dipolar models is investigated using density-functional theory and absolute-stability analysis. It is emphasized that for such systems well-defined results can only be found by specifying exactly how the long-range dipolar interactions are treated. Explicit form…
Spatially resolved electron energy-loss spectra have been recorded from the same E = 11 grain boundary of a high purity sapphire (α - Al 2O3) bi-crystal that had previously been examined by high resolution electron microscopy. The energy-loss near-edge structure (ELNES) on the aluminium L2,3 edge of the bulk α - Al2O3…
The mixed-valence complex [Cu2L]3+1[L ={N[CH2CH2N(H)CH2CH2N(H)CH2CH2]3N]} has been shown from EPR, visible Spectroscopic, and single-crystal X-ray diffraction measurements to possess an unpaired electron delocalized over a short Cu(1.5)–Cu(1.5) bond in both the hydrated nitrate [2.364(2)Å] and acetate [2.415(2)Å] salt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformations and order in atactic poly(vinyl chloride) melts from molecular dynamics simulationsGrant D. Smith, Richard L. Jaffe, and Do Y. YoonCite this: Macromolecules 1993, 26, 2, 298–304Publication Date (Print):January 1, 1993Publication History Published online1 May 20…
The Π-A isotherms at the air-water interface and 25°C for monomolecular films of the recently synthesized dendrimer surfactants are reported and compared with those of polystyrene terminated with a single hydroxyl group. There is a strong dependence of the isotherms on molecular weight (MW) for both systems, the lower…
The synthesis of eight derivatives of a 26π-electron macrocycle analogous to the porphyrins bearing six pyrrole rings and six methine bridges is described. This chromophore is named hexaphyrin. Owing to the flexibility of their chromophore, hexaphyrins are able to form two kind of binuclear coordination complexes of s…
Model polymers for materials science, L.J. Fetters, E.L.Thomas amorphous polymer microstructure, F.T. Gentile, U.W. Suter structure of polymer single crystals, B. Lotz, J.-C. Wittmann crystallization and morphology of semicrystalline polymers, P.J. Barham structure of liquid crystalline polymers, M. Ballauff structure…
Cu is receiving increasing attention as a replacement for Al in future Si ultra-large-scale integrated circuits due to its lower resistivity and potentially better reliability in terms of electromigration resistance and stress-induced voiding. Metalorganic chemical vapor deposition (MOCVD) of Cu offers the advantages…
Novel starburst molecules based on π-electron systems, 1,3,5-tris[4-(diphenylamino)phenyl]benzene and its methyl-substituted derivatives, have been synthesized and found to constitute a new family of amorphous molecular materials with high glass-transition temperatures above 100°C.