Materials Literature
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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…
The effect of blend ratio and compatibilization on dynamic mechanical properties of PP/NBR blends was investigated at different temperatures. The storage modulus of the blend decreased with increase in rubber content and shows two Tg's indicating the incompatibility of the system. Various composite models have been us…
Anomalous effects associated with the electrochemical cycling of electrogenerated polypyrrole films after polarization at high cathodic potentials were simulated from a derivation of the electrochemically stimulated conformational relaxation model. The cathodic treatment promotes the compaction of the polymer by confo…
The mode assignments of the sixteen Raman bands observed for monoclinic zirconia (ZrO2) have been made by measuring the Raman spectra of the cationic- as well as the anionic-labelled compounds, that is, 91.22Zr(16O1—x18Ox)2 (x = 0.002 to 0.760) and 93.80Zr16O2. The four Raman bands at 334, 224, 192, and 180 cm—1 were…
We demonstrate the deposition of ZnS thin films with a thickness of 0.04 to m at temperatures ranging from 25 to C from chemical baths comprising zinc sulphate, triethanolamine and thioacetamide at pH of about 10. The as-deposited films do not show crystallinity, are very resistive (conductivity ) and possess no photo…
Luminescence properties are reported for the Eu 2+ -doped materials Ba 2 Mg(BO 3 ) 2, Ba 2 Ca(BO 3 ) 2, and Sr 2 Mg(BO 3 ) 2; they exhibit red, green, and yellow emission, respectively. Results from these materials have been coupled with those from another extensive series of Eu 2+ -doped borates to establish a correl…
Abstract The unsteady‐state kinetics of NH 3 adsorption–desorption and of selective catalytic reduction (SCR) of NO with NH 3 were studied over model V 2 O 5 /TiO 2 and V 2 O 5 –WO 3 /TiO 2 catalysts by transient response techniques. Over both catalysts the dynamic experiments could be successfully described by a kine…
The diesel particulate filter (DPF) technology with the use of fuel additives as regeneration aids is a promising technology for modern and future low-emissions diesel engines. The development of efficient and reliable DPF systems requires understanding of the regeneration process. Although the role of mathematical mo…
Macroscopically oriented silicate−surfactant liquid crystals are produced by slow cooling of lamellar and hexagonal mesophases through their isotropic−anisotropic phase transition in an 11.7 T magnetic field. Comparisons of in situ experimental and simulated 2 H NMR spectra quantify the degrees of orientational order…
Silver and mercury ions are reduced in a common solution by sodium borohydride in the presence of poly(ethyleneimine). Colloidal alloy particles are formed, whose plasmon absorption band is blue-shifted with increasing mercury-to-silver ratio. The reduction mechanism is rather complex: large mercury “drops” are first…