Materials Literature
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Surface-enhanced resonance Raman scattering (SERRS) of a model derivative of TNT was detected using a microflow cell designed within the framework of the lab-on-a-chip concept, using only the analyte and readily available reagents. The SERRS substrate, silver colloid, was prepared in situ, on-chip, by borohydride redu…
The development of dendrimer chemistry has seen the realisation of a diverse range of architecturally fascinating macromolecules that have received extensive attention in the literature. Perhaps the most synthetically challenging hyperbranched polymers are chiral dendrimers and this review describes notable examples i…
The solid-state (13)C CP-MAS NMR spectra of biosynthetically labeled [(13)C(alpha)]Tyr, [(13)C(beta)]Tyr, and [(13)C(alpha)]Val silk fibroin samples of Bombyx mori, in silk I (the solid-state structure before spinning) and silk II (the solid-state structure after spinning) forms, have been examined to gain insight int…
Transient gelation in colloid-polymer mixtures is an interesting but poorly understood non-equilibrium phenomenon which has recently attracted the attention of experiment and theory. In a transient gel the particles aggregate, by the depletion interaction, to form a space-spanning network which maintains its structura…
Amyloid fibrils are associated with a variety of neurodegenerative maladies including Alzheimer's disease and the prion diseases. The structures of amyloid fibrils are composed of beta-strands oriented orthogonal to the fibril axis ("cross beta" structure). We previously reported the design and characterization of a c…
The robustness of the self-organized critical (SOC) state observed in the motion of an annular plate rotating over a granular medium is studied in this paper. In particular, we investigate the effect of parameters to which the emergent SOC state may be sensitive, including the initialization scheme, driving velocity,…
We show that the method of factorizing the evolution operator to fourth order with purely positive coefficients, in conjunction with Suzuki's method of implementing time-ordering of operators, produces a new class of powerful algorithms for solving the Schroedinger equation with time-dependent potentials. When applied…
This work studies the influence of microstructures and crystalline defects on the superconductivity of MgB2, with the objective to improve its flux pinning. A MgB2 sample pellet that was hot isostatic pressed (HIPed) was found to have significantly increased critical current density (Jc) at high fields than its un-HIP…
Calculations of L-shell x-ray absorption in transition metals are shown to be sensitive to screening, both of the x-ray field and the photoelectron-core hole interaction. This screening is calculated using a generalization of the time dependent local density approximation and a projection onto a local atomic basis. Th…
Glycerol is oxidised to glyceric acid with 100% selectivity using either 1% Au/charcoal or 1% Au/graphite catalyst under mild reaction conditions (60 degrees C, 3 h, water as solvent).
<div class="htmlview paragraph">A procedure for the computation of fatigue life of shafts subjected to variable amplitude independent bending and torsion loading is described. The elastic superposition technique, followed by a Neuber plasticity correction, also allows for the initial and possibly cyclic plastici…
The influence of carbon precursors, such as methane (CH4), acetylene (C2H2), and propane (C3H8), on the gas-phase chemistry of the TiCClH system used to deposit titanium carbide (TiC) from titanium tetrachloride (TiCl4) was investigated by calculating the thermodynamic equilibrium and modeling rate equations from a…
Abstract Plasma transferred arc spraying of tungsten carbide coatings can significantly increase the service life of machines and components subject to wear. This paper assesses the effect of such coatings in oil sand processing equipment. It describes the development and testing of the layers used and explains that t…
<div class="htmlview paragraph">Development of the ultra thin wall ceramic catalytic substrate is necessary to meet increasingly strict emissions regulations. The cell walls need to be thinner in order to improve the warm-up characteristics related to the reduction of emissions and to lower the back pressure. Ho…
Hexadentate cyclen complexes of Sm(III), Eu(III) and Yb(III) have been prepared from 1,4-bis[(R)-α-methylbenzylaminocarbonylmethyl]-1,4,7,10-tetraazacycldodecane and characterised. The crystal structures of the isomorphous complexes of Eu(III) and Sm (III) have been determined. These may be electrochemically reduced t…
<div class="htmlview paragraph">Bare magnesium is not compatible with the zinc phosphate process commonly used in automotive manufacturing today. If a magnesium component is assembled onto the vehicle prior to the phosphate process, it must be coated beforehand to prevent magnesium dissolution in the phosphate b…
<div class="htmlview paragraph">To establish performance trends in ultra thin wall substrates and help support their selection criteria for designing catalytic converter systems, the light-off behavior of five Ultra Thin Wall ceramic substrates and two catalysts on an engine dynamometer are hereby examined. Mode…
<div class="htmlview paragraph">This paper summarizes results from a large study on the desulfation characteristics of lean NO<sub>x</sub> traps. Degreened and thermally aged NO<sub>x</sub> trap formulations were poisoned with SO<sub>2</sub> multiple times in a flow reactor. T…
We have grown Er,O-codoped InGaAs/GaAs multiple-quantum-well (MQW:Er,O) structures by low-pressure organometallic vapor phase epitaxy (OMVPE), and investigated their luminescence properties. The MQW structures are designed to emit light at 0.98 μm for direct excitation of Er ions. Degradation of the structures due to…
Using a scanning microwave microscope, we investigated the local electrical properties of epitaxial CaRuO3 thin films. The films showed a metal–insulator transition depending on the growth temperature and their thickness. We observed spatially separated highly conducting and poorly conducting regions in the films grow…