Materials Literature
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Infrared spectra of aluminium carbonyl complexes generated in argon matrices by co-condensation of aluminium atoms and carbon monoxide have been observed and analysed. AlCO, aluminium monocarbonyl, was isolated and clearly identified. It is characterized by a carbonyl force constant (Fco≈ 14 mdyn Å–1) markedly smaller…
We report on the reaction of SO 2 and NO 2 in sub‐ppm concentrations in humid air with a copper surface. The deposition of SO 2 was studied in a time‐resolved manner and the formation of HNO 2 was measured. Corrosion products were analyzed using XRD, FTIR, FTIRAS, and ion chromatography. S IV ‐O species on the copper…
The dependence of mesomorphism of 1,3-diketonate vanadium-oxo (vanadyl) complexes on the number of side chains was investigated. These complexes have a large dipole normal to the disc plane and are under investigation in an effort to generate discotic phases with polar order. Relatively complex phase behaviour is obse…
The extent of the surface crosslinking of high-density polyethylene (HDPE) under various plasma treatment conditions was investigated. The plasma modification efficiency was studied by surface energy and adhesive bond strength measurements. The results show that the surface crosslinking of HDPE takes place as soon as…
A variety of characterization methods based on X-ray scattering may be used to sensitively probe the structure of polymer surfaces and interfaces. Among these are small angle scattering in transmission, specular reflectivity, grazing incidence off-specular scattering, and grazing incidence diffraction. X-ray measureme…
The development of membrane systems that are adaptive-whose physical and/or chemical properties can be manipulated after synthesis—expands the applicability of membrane technology. In this work, we have employed both polyaniline and polypyrrole based membranes to demonstrate how transport of ionic species can be regul…
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Abstract
Abstract Synthetic goethite used to study the effects of reaction time and temperature on the pH‐dependent sorption of Ni, Zn and Cd was associated with amorphous silica. Ni interacted with dissolved Si and formed a Ni/Si precipitate on the goethite surface. Individual metals added at a concentration of 0.5 μmol g −1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin and charge transfer through hydrogen bonding in [Co(NH3)5(OH2)][Cr(CN)6]Brian N. Figgis, Edward S. Kucharski, and Mary VrtisCite this: J. Am. Chem. Soc. 1993, 115, 1, 176–181Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published…
Abstract Single crystal X-ray analysis has been carried out for the title compound, –COOCH(CH3)C6H13, which has antiferroelectric liquid crystalline phases. Crystal data; monoclinic, P21, T = 298 K, a = 32.285(7), b = 5.520(2), c = 9.320(2) Å, β = 95.34(2)°, V = 1653.7(7) Å3, Z = 2, dx = 1.123 g cm−3. The crystal has…
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…