Materials Literature
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Addition of a phenyl Grignard reagent to a toluene solution of the nickel(II) chloride complex of a dimethylated inverted porphyrin, (2-NCH3-21-CH3CTPP)NiIICl (1), at 203 K results in the formation of a rare paramagnetic (sigma-phenyl)nickel(II) species, (2-NCH3-21-CH3CTPP)NiIIPh (2). The coordination of the sigma-phe…
The bond distance and vibrational spectrum of the chromate(VI) ion has been calculated using HF-SCF and SCF-density functional (SCF-DFT) methods in conjunction with a wide range of basis sets. It was found that the B3-LYP/LanL2DZ combination gave the best fit for the observed vibrational spectrum. The molecular geomet…
This work reports that the optimum diamond grain size can be controlled by adjusting the flow rate of Ar/H 2 in the reaction chamber through orthogonal optimization. The dielectric properties of the diamond films were investigated using an RCL (resistance-capacitance-inductance) meter. It was found that (i) the domina…
This is the first time that the adsorption of phenanthrene (Phe) for hot gas emissions cleaning from combustion has been studied. For this goal, the adsorption capacity of 10 active carbons with different origins and a wide range of textural characteristics has been assessed for Phe removal from hot gas emissions. The…
Highly c -axis orientated growth nano-crystalline V 2 O 5 films were successfully synthesized on In 2 O 3 :SnO 2 glass by using the laser ablation technique at deposition temperatures as low as 200°C. The structural properties of as-deposited and annealed VO x thin films were analysed using the scanning accessory of a…
The synthesis, spectroscopic characterization, and electrochemistry of five new phosphorus corroles are reported. The investigated complexes contain alkyl, aryl, oxo, or hydrido axial ligands and are represented as (OEC)P(H)2, (OEC)P(CH3)2, (OEC)P(C6H5)2, (OEC)P=O, and [(OEC)P(CH3)]+ClO4-, where OEC is the trianion of…
This paper describes gold, silver, and palladium nanoparticles coated with monolayers of trimethyl(mercaptoundecyl)ammonium ligands. The monolayer-protected clusters (MPCs) are synthesized in aqueous medium and are water soluble. In dry films, their highly charged surfaces inhibit the interdigitation of monolayer chai…
We consider the dynamics of lattices which have constrained constitutive units flexible in only their mutual orientations. A continuum description is derived through which it is shown that the models have zero shear velocity, free-particle like internal rotational modes and volume decreasing linearly with temperature.…
The accuracy of equation-of-state formulations is compared for theoretical total energies or experimental pressure-volume measurements for H$_{2}$, Ne, Pt, and Ta. This spans the entire range of compression found for minerals and vo latiles in the Earth. The Vinet equation is found to be most accurate. The origin of t…
We report calculations of the effective electronic response of aligned multishell carbon nanotubes. A local graphite-like dielectric tensor is assigned to every point of the multishell tubules, and the effective transverse dielectric function of the composite is computed by solving Maxwell's equations. Calculations of…
Layered core−shell bimetallic silver−gold colloids in the size range of 10−16 nm have been prepared by the seed-growth method. Silver nuclei were covered by gold shells of various thicknesses without any stabilization agent. Interfacial (Ag)Au colloid−2,2‘-bipyridine films were prepared from these bimetallic colloids…
Ag-coated Au and Au-coated Ag colloidal particles were prepared by deposition of Ag or Au through chemical reduction on Au or Ag colloids, respectively. Different amounts of the depositing metal were employed in order to obtain different compositions of the Au 100 - x Ag x and Ag 100 - y Au y resulting particles. The…
Described is the construction of an ultrafast electrochromic window. One electrode of this window is based on a transparent nanostructured TiO 2 (anatase) film (4.0 μm thick) supported on conducting glass (F-doped tin oxide, 10 Ω cm -2, 0.5 μm thick) and modified by chemisorption of a monolayer of the redox chromophor…
Magnesium is a key determinant in CaCO3 mineralization; however, macroscopic observations have failed to provide a clear physical understanding of how magnesium modifies carbonate growth. Atomic force microscopy was used to resolve the mechanism of calcite inhibition by magnesium through molecular-scale determination…
Acoustic noise emissions from a direct torque controlled (DTC) induction motor drive are investigated. Due to the hysteresis control of the flux and torque, DTC results in a variable switching frequency and dispersed voltage and current harmonic spectra. It is shown that both the bandwidths of the flux and torque hyst…
We theoretically investigated electron and phonon transport in a quantum superlattice and evaluated a possible thermoelectric figure of merit increase. The presented model takes into account electron and phonon transport modifications due to the space confinement caused by the mismatch in electronic and thermal proper…
Recent experiments of Rosakis et al. have clearly shown that the crack-tip velocity can exceed the shear wave speed for a crack tip propagating between two weakly bonded, identical and isotropic solids under shear-dominated loading. This has motivated recent theoretical and numerical studies on intersonic crack propag…
III. Gas Phase Applications 10 A. Removal of Volatile Organic Compounds (VOCs) from Air 10 B. Purification of Landfill Gas 18 C. Air Conditioning 19 D. Mercury Vapor Adsorption 20 E. Protective Filters 20 F. Flue Gas Cleanup 21 G. Gas Storage on Activated Carbons 31 IV. Water Treatment 34 A. Introduction 34 B. Propert…
Using time correlated single photon counting combined with temperature dependent diffraction limited confocal photoluminescence spectroscopy we accurately determine, for the first time, the intrinsic radiative lifetime of single excitons confined within semiconductor quantum dots. Their lifetime is one (two) orders of…
Based on {\em ab initio} calculation, we propose a new structure for the fundamental excitation of the reconstructed 30$^\circ$ partial dislocation in silicon. This soliton has a rare structure involving a five-fold coordinated atom near the dislocation core. The unique electronic structure of this defect is consisten…