Materials Literature
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We report a metalization technique for electrically addressing templated vertical single-walled carbon nanotubes (SWNTs) using in situ palladium (Pd) nanowires. SWNTs are synthesized from an embedded catalyst in a modified porous anodic alumina (PAA) template. Pd is electrodeposited into the template to form nanowires…
The addition of neutral coligands to reduce the aggregation and improve the volatility of potential heavy alkaline-earth metal chemical vapor deposition (CVD) precursors has typically resulted in liberation of the coligand upon heating. A new series of dinuclear alkaline-earth and rare-earth metal pyrazolates, bis[bis…
Intercalation of an organic photochromic molecule into layered magnetic systems may provide multifunctional properties such as photomagnetism. To build up a photosensitive multifunctional magnet, an organic-inorganic hybrid system coupled with a photochromic diarylethene anion, 2,2'-dimethyl-3,3'-(perfluorocyclopenten…
The membrane protein Imp1227 (Ignicoccus outer membrane protein; Imp1227) is the main protein constituent of the unique outer sheath of the hyperthermophilic, chemolithoautotrophic Archaeum Ignicoccus hospitalis. This outer sheath is the so far only known example for an asymmetric bilayer among the Archaea and is name…
Structural transformations around both V and Cr atoms in (V1-xCrx)2O3 across its metal-insulator transition (MIT) at x approximately 0.01 are studied by extended x-ray absorption fine-structure technique. Our new results for Cr made possible by the use of a novel x-ray analyzer that we developed reveal the substitutio…
We have studied experimentally and theoretically the cross-plane Seebeck coefficient of short period $\mathrm{InGaAs}∕\mathrm{InAlAs}$ superlattices with doping concentrations ranging from $2\ifmmode\times\else\texttimes\fi{}{10}^{18}$ up to $3\ifmmode\times\else\texttimes\fi{}{10}^{19}\phantom{\rule{0.3em}{0ex}}{\mat…
We present thin organic electrochromic films of newly synthesized anionic triarylamine polymers by LBL assembly. As an electrochromic functional moiety, triarylamine has unique properties. The newly synthesized polymers give rise to high contrast ratio and fast switching electrochromic films.
Recently, it has been suggested that metamaterials with high refractive index can be constructed using metal gratings with periodic subwavelength slits [J. T. Shen et al., Phys. Rev. Lett 94, 197401 (2005)]. We designed such metamaterials and investigate their transmittance and reflectance in the terahertz frequency r…
Magnetic and specific heat measurements were performed in a single-phased powder BiMnO3 sample prepared at 6 GPa and 1383 K. The imaginary part of the ac susceptibilities showed strong frequency dependence below the ferromagnetic Curie temperature of 98 K. The relaxation measurements revealed time-dependent magnetic p…
We have investigated polarized optical conductivity for the triangular-lattice Mott insulator $\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{ET})}_{2}{\mathrm{Cu}}_{2}{(\mathrm{C}\mathrm{N})}_{3}$ over the photon-energy range of $E=8\phantom{\rule{0.3em}{0ex}}\mathrm{meV}--5\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$.…
Going round the outside: The palladium-catalyzed coupling of meso-bromoporphyrins with a variety of internal alkynes efficiently provides peripherally cyclopentadiene-fused porphyrins. This modification has a significant impact on the electronic system of the porphyrin rings (see scheme), which results in non-porphyri…
An argon glow discharge plasma was used to treat H 2 PtCl 6 impregnated Al 2 O 3 powder at room temperature. The obtained sample was characterized by ultraviolet−visible spectroscopy (UV−vis), X-ray photoelectron spectroscopy (XPS), CO adsorbed diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy, X-ray…
The mechanisms controlling stress relief during the drying and pyrolysis processes of trifluoroacetate metal-organic precursors have been elucidated in view of high rate fabrication of epitaxial superconducting YBa 2 Cu 3 O 7 thin films. Combining FTIR, TGA, and film thickness evolution measurements, we conclude that…
The role of deformation twinning in the texture evolution of pure polycrystalline silver subjected to equal channel angular extrusion (Route A, three passes) has been examined. Microstructural characterization using electron backscattering diffraction and transmission electron microscopy revealed high twinning activit…
The synthesis of a lipophilic ethylenediamine palladium(II) complex and its activity in planar bilayer membranes are reported. In acetonitrile solution containing one equivalent of 4,4-bipyridine the complex forms the expected metallosupramolecular tetrameric square. The same mixture provokes transmembrane conductance…
The dynamic structure factor, vorticity and entropy density dynamic correlation functions are measured for stochastic rotation dynamics (SRD), a particle based algorithm for fluctuating fluids. This allows us to obtain unbiased values for the longitudinal transport coefficients such as thermal diffusivity and bulk vis…
We present temperature versus concentration phase diagrams for "shape amphiphiles" comprised of tethered moderate and low aspect ratio rods. Simulations of moderate aspect ratio rods (first reported by Horsch et al. [Phys. Rev. Lett. 95, 056105 (2005)]) predict their self-assembly into spherical micelles with bcc orde…
The relationship between deformation and dislocation properties has been studied for pure polycrystalline nickel and austenitic stainless steel AISI 316L in stage III. Special care was taken to study statistically the effects of the grain size and grain orientation on dislocation densities and distribution. It is show…
A dense pellet of the polycrystalline $\mathrm{Sr}\mathrm{Co}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ $(0\ensuremath{\leqslant}\ensuremath{\delta}<0.2)$ was obtained by a high-pressure method, and electronic transport properties of the stoichiometric perovskite were measured. A large electronic specific-h…
Novel liquid-crystalline polymers (LCPs) containing a long azotolane moiety were synthesized, and the relationship between the chemical structures and the photoresponsive behavior was investigated. All homogeneously aligned LCP films exhibited extremely high values of birefringence (Deltan) in the wide wavelength rang…