Materials Literature
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From a newly synthesised tridentate ligand [pepci =N′-(2-pyridin-2-ylethyl)pyridine-2-carbaldimine] two new octahedrally co-ordinated nickel(II) dimers, [{Ni(pepci)(N3)2}2]1 and [{Ni(pepci)(NCS)2}2]2, have been prepared. The crystal structure 1 has been solved. It crystallizes in space group P21/c with four formula we…
The chemical, mechanical, and optical properties of the first two members of a new family of fluoroplastic materials are examined. These new materials have the unique properties of being optically transparent in the visible and near IR and also chemically inert. Comparison of the optical properties to other transparen…
The book, which is based on a short course held by the Thermal Analysis Consultancy Service of the University of Leeds, aims to provide an overview of the principal thermal methods and their application in major areas of importance. The instrumental topics covered include: differential thermal analysis (DTA), differen…
A complete model for transformers is derived on the basis of very efficiently calculated elementary (turn-to-turn) parameters. A high-order turn-to-turn model is constructed for the windings. This model is reduced to a lower order by operating on the resulting matrices. An electric equivalent circuit for the core is o…
The occurrence of longitudinal-transverse splittings in the optic-vibrational-mode frequencies of partially ionic glasses has previously been observed in several glass systems and was also theoretically confirmed. The transverse-optic (TO) and longitudinal-optic (LO) components are usually derived from near-normal inf…
The effect of B2O3 on the viscosity of a haplogranitic liquid (KrO-Na,O-AlrOr-SiO,) hasbeen determined at I atm pressure in the temperature interval of 600-1600 °C. Viscositymeasurementso f a haplogranite, haplogranite + 4.35 wt% B2O3 and haplogranite + 8.92 wt% B2O3 have been performed using the concentric cylinder a…
In previous work it has been shown how to calculate the magnetization curve from a simple theory which invokes a constant energy loss per unit change in magnetization in a ferromagnet. The energy loss, which is therefore proportional to the change in magnetization, leads to hysteresis loops which are obtained from fir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar structure and morphology of nylon 46 crystals: a new chain folding mechanism for nylonsE. D. T. Atkins, M. Hill, S. K. Hong, A. Keller, and S. OrganCite this: Macromolecules 1992, 25, 2, 917–924Publication Date (Print):January 1, 1992Publication History Published on…
The hydration numbers of various dysprosium(III) polyaminocarboxylates have been determined from the DyIII-induced 17O NMR water shifts. The results are in good agreement with those obtained by other techniques. The data indicate that formation of polynuclear species occurs in the iminodiacetate and nitrilotriacetate…
Article Stability and Instability of an Uniaxial Alignment Against Biaxial Distortions in the Isotropic and Nematic Phases of Liquid Crystals was published on January 1, 1992 in the journal Journal of Non-Equilibrium Thermodynamics (volume 17, issue 2).
A method for determining the phase-retardation function of the uniform-intensity axilens is discussed and compared with that of an earlier publication [Opt. Lett. 16, 523 (1991)]. Within the presented formulation good agreement is achieved between the geometrical-optics prediction and the numerically evaluated diffrac…
Antiferroelectric smectic liquid-crystalline materials have recently been shown to be of use in display devices where they show tristable switching behaviour. Most liquid-crystalline materials that exhibit antiferroelectric properties are, however, highly chiral and therefore have helical macrostructures. Unfortunatel…
Silica gel has been modified with γ-aminopropyltriethoxysilane under varying conditions, controlling the influence of water in the different modification stages. Diffuse reflectance infrared Fourier-transform (DRIFT) spectra revealed the influence of surface water in the reaction stage and of air humidity in the curin…
An efficient, elegant, and systematic formulation technique which, combining Fourier transform with matrix analysis methods, is suitable for problems related to radiation by dipole or other sources in the presence of an arbitrarily general stratified anisotropic medium has been recently developed. This technique is ad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses of intercalation compounds of layered niobates with methylviologen and their photochemical behaviorTeruyuki Nakato, Kazuyuki Kuroda, and Chuzo KatoCite this: Chem. Mater. 1992, 4, 1, 128–132Publication Date (Print):January 1, 1992Publication History Published onlin…
Abstract
Isopolytungstates have been studied in aqueous solution between pH 8 and 1.5, using 183W, 17O and 1H NMR spectroscopy. The first polyanions to form upon acidification are the paratungstates A and B. Their resonances are largely assigned, and paratungstate B is shown to protonate with pKa= 4.59. Its protonated form has…
Calculations of defect formation energies at ceria (CeO2) surfaces using atomistic simulation techniques based on the Born model of the ionic solid predict the enhancement of carbon monoxide oxidation.
Collagen has been used as a substrate for growth of cells derived from skin and cardiovascular tissue. Experimental results reported in the literature suggest that cell differentiation and orientation is enhanced in the presence of collagen. Extensive progress in cultivation of autogenous and allogeneic cells in vitro…
The refined spin-pairing energy theory (RSPET) has been improved in order to understand quantitatively the tetrad or double-double effects recognized in the Ln3+ ionic radii. Since the ionic radii have been determined from the lattice constants and structural parameters of LnO1.5 and LnF3, the lattice energies of the…