Photochemistry of polyoxometallates of molybdenum and tungsten and/or vanadium
E. Papaconstantinou, Chem. Soc. Rev., 1989, 18, 1 DOI: 10.1039/CS9891800001
Materials Literature
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Carbon monoxide and carbon dioxide adsorption on cerium oxide studied by Fourier-transform infrared spectroscopy. Part 1.—Formation of carbonate species on dehydroxylated CeO2, at room temperature
The adsorption of CO and CO2 on cerium oxide has been studied by Fourier-transform infrared spectroscopy (F.t.i.r.). For CO adsorption at room temperature, in addition to linearly adsorbed CO (2177 and 2156 cm–1), two kinds of carbonate (unidentate: 854, 1062, 1348 and 1454 cm–1 and bidentate: 854, 1028, 1286 and 1562…
Calixarenes: An Introduction
From Resinous Tar to Molecular Baskets Making the Baskets: Synthesis of Calixarenes Proving the Baskets: The Characterization and Properties of Calixarenes Shaping the Baskets: Conformations of Calixarenes Embroidering the Baskets: Reactions of Calixarenes and Introduction of Functional Groups Filling the Baskets: Com…
The anionic group theory of the non-linear optical effect and its applications in the development of new high-quality NLO crystals in the borate series
Starting from a general quantum-mechanical perturbation theory on the nonlinear optical (NLO) effect in crystals, this review gives a systematic presentation of the basic concepts and calculation methods of the ‘anionic group theory for the NLO effect of crystals’ and a brief discussion of the approximations involved.…
Magnetoresistance in metals
Preface 1. Survey of basic principles 2. Measurement 3. Real metals 4. Quantum effects 5. Inhomogeneous materials 6. Size effects.
Structure and mechanism
Enzyme Modifications for Nuclear Magnetic Resonance Studies: J.T. Gerig, Fluorine Nuclear Magnetic Resonance of Fluorinated Ligands. D.M. LeMaster, Deuteration in Protein-Proton Magnetic Resonance. D.C. Muchmore, L.P. McIntosh, C.B. Russell, D.E. Anderson, and F.W. Dahlquist, Expression and Nitrogen-15 Labeling of Pro…
Superparamagnetic iron oxide: pharmacokinetics and toxicity
The pharmacokinetics (distribution, metabolism, bioavailability, excretion) and toxicity (acute and subacute toxicity, mutagenicity) of a superparamagnetic iron oxide preparation (AMI-25), currently used in clinical trials, were evaluated by 59Fe radiotracer studies, measurements of relaxation times, the ability to re…
Polyanilines: a novel class of conducting polymers
The polyanilines are a class of polymers the base form of which has the general formula [graphic omitted] containing y reduced and (1 –y) oxidized repeat groups. y can in principle be varied continuously from one, the completely reduced material, to zero to give the completely oxidized polymer. The emeraldine oxidatio…
Powder Processing Science and Technology for Increased Reliability
Issues concerning powder consolidation methods compatible with the colloidal approach and issues associated with other powder processing steps, viz., densification and microstructural control, are presented with regard to research directions leading to more reliable ceramics.
Hydrous Phyllosilicates
Volume 13 of Reviews in Mineralogy presents much of our present-day knowledge of micas. Since 1984 was too much material available to attempt to cover all of the hydrous phyllosilicates in one volume, the micas were treated first because of their abundance in nature and the fact that many detailed studies had been car…
The temperature dependence of Cr3+photoluminescence in some garnet crystals
The temperature dependence of Cr 3+ photoluminescence has been measured in the garnets Y 3 Ga 5 O 12 , Gd 3 Sc 2 Al 3 O 12 and Gd 3 Sc 2 Ga 3 O 12 . The observed intensities in the 2 E g to 4 A 2g and 4 T 2g to 4 A 2g emission transitions are interpreted using a model based on the effects of small changes in unit-cell…
Epitaxial growth of ErAs on (100)GaAs
Successful growth of (100)ErAs single-crystal films on (100)GaAs has been demonstrated. Reflection high-energy electron diffraction, low-energy electron diffraction (LEED), and Rutherford backscattering with channeling indicate single-crystal growth. LEED from the ErAs shows a (1×1) structure. Overgrowth of GaAs on Er…
Continuous Nematic-Isotropic Transition in Submicron-Size Liquid-Crystal Droplets
Deuterium NMR of nematic droplets in a polymer matrix reveals the effect of confinement on molecular orientational ordering near the nematic-isotropic ($N\ensuremath{-}I$) phase transition. For large droplets of 0.35 \ensuremath{\mu}m in diameter, the $N\ensuremath{-}I$ transition is first order. For droplets of less…
Low-loss substrate for epitaxial growth of high-temperature superconductor thin films
A perovskite-like single-crystal substrate material has been investigated that simultaneously permits epitaxial growth of 1-2-3 superconductor films and possesses desirable rf properties of low dielectric constant and loss tangent. The lattice constant of 3.792 Å provides a lattice match to within 1% of the a axis of…
ChemInform Abstract: Wettability Effect on the Corrosion Kinetics of Iron Anodes in Sulfuric Acid Solutions.
Abstract The interdependence of electrode wetting and electrode corrosion rate is studied by measuring electrode corrosion rates, passive‐active transition current oscillation amplitudes, and electrode‐electrolyte contact angles for iron electrodes in aqueous H2SO4 solutions of various concentrations and in 1 M H2SO4…
Monte Carlo simulation of hydrogen diffusion in metal and alloys
Monte Carlo simulations of diffusion in a lattice gas with both long-range (mean-field) and short-range interactions are presented. Deviations from the conventional site-blocking model are observed, in agreement with experimental data for hydrogen diffusion in Pd. Simulations of multi-site lattice gases, with site-dep…
Superhard material comparable in hardness to diamond
Superhard boron suboxides, with hardness close to that of diamond, were synthesized from boron/boron oxide mixtures. Such hardness is expected when a material’s molar volume approaches the value characteristic for diamond. These materials consist of boron-rich phases belonging to the boron-oxygen system. The phase whi…
Empirical Interatomic Potential for Carbon, with Applications to Amorphous Carbon
An empirical interatomic potential is introduced, which gives a convenient and relatively accurate description of the structural properties and energetics of carbon, including elastic properties, phonons, polytypes, and defects and migration barriers in diamond and graphite. The potential is applied to study amorphous…
Study of special triple junctions and faceted boundaries by means of the CSL model
Sufficient work has been made until now on the grain boundaries (GBs) multi-junctions in different polycrystalline cubic materials by using electron microscopy. In the present work the main characteristics of the majority of the junctions reported are theoretically investigated. In fact triple junctions (TJs) show a v…
Trigonal sites of Eu2+ in single crystals of Cs2NaYCl6
Electron paramagnetic resonance measurements are reported for Eu2+ ions occupying trigonal sites in Cs2NaYCl6 single crystals. Spin–Hamiltonian parameters are reported at room temperature. A tentative model for the location of the impurity in the lattice is discussed.