Materials Literature
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A binuclear tetraprotonated macrocyclic complex [Mg(2)(L(2)-H(4))(NO(3))(2)](NO(3))(2).6H(2)O (1) has been obtained by template condensation of 4-methyl-2,6-diformylphenol and 1,2-diaminoethane in the presence of magnesium acetate and nitrate. Complex 1 on reduction with NaBH(4), followed by the removal of magnesium,…
Five Victorian reservoirs of brick pillar and arch construction were renovated using geosynthetic clay liners (also called bentonite/geosynthetic composites) (GCL) as roof sealing materials. The GCL was predominantly sodium bentonite and contained some 2% of calcite. GCLs were laid on leveled, original puddled clay pa…
The hydrolytic condensation of PhSiCl3 (H2 O/acetone, 0–5°C, 18 h) precipitates cis-cis-cis-[(C6 H5 )4 Si4 O4 (OH)4 ] (5a) as the sole crystalline product in approximately 40% yield. The all-cis structure, which was originally assigned by J. F. Brown
The effect of hydrothermal conditions on the interactions between surfactant molecules and silicate species plays a key role in the structural transformations of silica precursors. In this work the structures of different siliceous products obtained at various synthesis temperatures have been characterized by powder X…
Formulae for equlibrium stripe domain width Weq in a nonductive ferroelectric plate of thickness d are deduced, taking into account electrostatic interaction of surfaces. It is shown that the classical formula giving W eq ∞ d 1/2 is not applicable when the sample thickness decreases below the value dcrit which is a fu…
The (100) face of β-cristobalite covered by geminal hydroxyls has been taken as a model for the silica surface in order to describe the hydrogen bonding and the condensation of the surface hydroxyls of silica. Periodic Hartree−Fock calculations have been performed for slabs of five atomic layers. The optimized orienta…
We invoke the Lifshitz theory of van der Waals forces to derive a simple, analytical expression for the adhesion across a planar metal-ceramic interface. The van der Waals energy is conveniently expressed as a function of readily accessible bulk properties of the respective materials. Application to several non-reacti…
We have characterized electrically conductive polymer, polypyrrole (Ppy), films on mild steel with atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). The Ppy films were polymerized electrochemically from sodium p-toluene sulphonate (ToS) water–ethanol solution. A very good corrosion protective e…
Steady-state rates and induction times for crystal nucleation in lithium disilicate melt depend exponentially on water content (up to 975 ppm). Time-dependent crystal number densities exhibit self-similar behavior as a function of water content, thereby allowing for a description of all data by a universal curve. This…
Several transition-metal phosphates, arsenates, and antimonates undergo direct reduction in hydrogen at relatively low temperatures (400−1050 °C) to the corresponding phosphides, arsenides, and antimonides, providing a convenient route for the synthesis of transition-metal pnictides. We have synthesized by this route…
Two key experimental properties of elemental liquids, together with an analysis of the condensed-system potential-energy surface, lead us logically to the dynamical theory of monatomic liquids. Experimentally, the ion motional specific heat is approximately $3Nk$ for $N$ ions, implying the normal modes of motion are a…
Abstract Solvent‐free sodium phenoxide (NaOPh) crystallises as a polymer and forms a polymeric chain in the [0 0 1] direction. The low coordination of the sodium atoms, as evident in the crystal structure, is confirmed by the easy coordination of oxoligands (α‐donors). Hence, the four‐membered ring chain of the solven…
Abstract Burial diagenesis of shales of the Frio Formation resulted in an increase in the abundance of mixed-layer illite-smectite (I-S), albite and chlorite, and a decrease in the abundance of K-feldspar, illite and kaolinite. Some of the mineralogic trends determined in this study contrast with the results of Hower…
The distance dependence function (DDF) of surface-enhanced Raman scattering (SERS) has been measured. A novel feature of this work is that a self-assembled monolayer (SAM) of alkanethiol is used as the spacer layer whose length is varied from 1 to 15 methylene units. In addition, an azobenzene Raman label is covalentl…
The weak classical through-space magnetic dipolar interactions have, in general, not been an important component in stabilizing bulk magnets, as the strong quantum-mechanical through-bond exchange couplings dominate. We show that for materials composed of strongly exchange-coupled magnetic chains with very weak interc…
Luminescence of Bi3+ and Bi3+ + Eu3+ in calcium tungstate powder prepared by the solid state diffusion method has been reported. The excitation and emission bands in CaWO4 and CaWO4:Bi3+ coincide and appear at 256 and 430.5 nm, respectively. The 430.5 nm emission band is ten times stronger in the latter case (for 1 mo…
The combined effect of relative humidity (RH) and temperature on O 2 and CO 2 permeability and selectivity (CO 2 to O 2 permeability ratio) of a wheat gluten film was evaluated using response surface methodology. Studied ranges of RH and temperature were 0−100% and 3−45 °C, respectively. CO 2 and O 2 permeabilities ra…
Conventionally, the critical potential represents the potential marking the onset of bulk dealloying. The current density below the critical potential is only weakly dependent on potential, and the physical processes responsible for this passive‐like behavior are poorly understood. In situ scanning tunneling microscop…
Abstract The interest in block copolymers containing liquid crystalline (LC) segments is due to the resulting interplay between mesophase formation and the microphase structure which creates opportunities in tailoring their nanostructure. This review summarizes recent literature reporting LC‐coil block copolymers with…
The viability of using polycrystalline, boron-doped diamond thin-film electrodes for the amperometric detection of ferrocyanide, ferricyanide, ethylamine, and ethylenediamine has been investigated for the first time. These redox reactions were studied by cyclic voltammetry, hydrodynamic voltammetry, and flow injection…