Materials Literature
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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…
Starting with only the chemical formula, La 2 NiO 4 , the phase diagram and the various structures it contains have been modelled using bond valences. The bonding graph is generated from the formula and is mapped into 3-dimensional space to give the archetypal K 2 NiF 4 structure. The inconsistencies between the requi…
The portion of the stable phase diagram for the ternary system CaO‐P 2 O 5 ‐H 2 O involving calcium phosphate phases more basic than Ca(H 2 PO 4 ) 2 has been constructed. Construction involves plotting concentrations as their fifth roots to allow phases having very different solubilities to be represented on a single…
The mathematical processing (deconvolution) of spectra obtained in a FTIR spectrometer permits the resolution of the absorbance range of the OH groups of cellulose into various bands. The distinction between celluloses I and II was successfully done by attributing certain bands to the crystal modifications independent…
Owing to the characteristics of electric-arc phenomena electric arc furnace loads can result in serious electrical disturbances on a power system. Low level frequency modulation of the supply voltage of less than 0.5% can cause annoying flicker in lamps and invoke public complaints when the frequency lies in the range…
The effect of acid treatment of montmorillonite clay on its activity as a support for ZnCl2 alkylation catalyst is examined. Maximum activity is associated with long acid treatment times. Structural characterisation, using X-ray diffraction (XRD), 29Si magic-angle-spinning nuclear magnetic resonance (MASNMR) and eleme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrolysis of water at strontium titanate (SrTiO3) photoelectrodes: distinguishing between the statistical and stochastic formalisms for electron-transfer processes in fuel-forming photoelectrochemical systemsAmit Kumar, Patrick G. Santangelo, and Nathan S. LewisCite this:…
The thermoelectric properties of Sb-doped n-type and Ag-doped p-type Mg2Si0.6Ge0.4 samples were investigated in the temperature range 300 to 900 K. The scattering factor r was determined to be 0.0 by measuring the temperature dependence of the Hall mobility. Thermoelectric power and electrical conductivity were measur…