Materials Literature
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The protein crystallography station at Los Alamos Neutron Science Center is the first to be built at a spallation neutron source. Time-of-flight methods in combination with a large electronic position-sensitive and time-sensitive detector are used in order to collect wavelength-resolved Laue diffraction data. The wave…
The influence of pH on the electrochemical behavior of electropolymerized, self-doped poly(aniline boronic acid) thin films in the presence of d -fructose has been investigated with voltammetry and potentiometry in phosphate-buffered saline solution. It was found that the complexation of boronic acid with d -fructose…
We calculate spin-dependent excitation energies of Ge and Si nanocrystals by means of a $\ensuremath{\Delta}$-self-consistent-field method that considers the excitation of an electron-hole pair and thus includes the electron-hole Coulomb interaction. The method is based on local-density and local-spin-density calculat…
NaBi(WO 4 ) 2 (NBW), NaBi(MoO 4 ) 2 (NBMo) and LiBi(MoO 4 ) 2 (LBMo) single crystals grown by the Czochralski technique have been doped up to a praseodymium concentration of in the crystal. 10 K polarized optical absorption and photoluminescence measurements have been used to determine the energy position of 32, 39 an…
The dielectric properties of glycinium phosphite (GPI) crystals as a function of temperature and electric field magnitude are investigated. The electric field E is applied perpendicularly to the ferroelectric b -axis in the direction of hydrogen-bonded phosphite chains in the crystal (the c -axis). The shift of the pa…
Two series of tetradental cis -enaminoketone Ni(II) complexes with triangular mesogenic core stiffened by external ethylene or methylene units have been synthesized. One of the obtained compounds reveals a unique phase sequence: Iso−Col h −Iso re . The enormously stable Col h phase has been detected for metallomesogen…
An automated Patterson deconvolution technique, based on the minimum superposition function, has been implemented into the SIR2002 package, a program for the ab initio determination of small and large molecules. The procedure, combined with the direct-space phase refinement routines present in the SIR2002 program, has…
Resonant soft x-ray emission (SXE) spectra of the mixed valence vanadium oxide ${\mathrm{V}}_{6}{\mathrm{O}}_{13}$ have been recorded for a series of excitation energies across the V $L$-absorption band. Resonant excitation allows one to distinguish between charge neutral low-energy excitations and continuum-excited,…
Shear alignment behavior was examined for smectic CA (S CA ) phase of main-chain BB-5(3-Me) polyester using a cone-and-plate fixture. In the smectic temperature region from 100 to 140 °C, two distinct orientations have been identified by wide-angle X-ray diffraction. At temperatures lower than 130 °C, the smectic laye…
The electronic structure of ${\mathrm{La}}_{0.7}{\mathrm{Ce}}_{0.3}{\mathrm{MnO}}_{3}$ (LCeMO) thin films has been investigated using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). The Ce $3d$ core-level PES and XAS spectra of LCeMO are very similar to those of ${\mathrm{CeO}}_{2},$ indicati…
The reactions of methane with [FeO 2 ] + and [OFeO)] + cations exchanged into ZSM-5 have been investigated using density functional theory. Experimental evidence for the latter cation has recently been reported on the basis of EXAFS experiments performed on Fe−ZSM-5 with Fe/Al = 0.17−0.80. Of the two iron-containing s…
Using in-situ small-angle X-ray scattering, the electric field induced orientation of symmetric block copolymers of polystyrene and polyisoprene was investigated. Alignment of the lamellar microdomains parallel to the electric field was achieved within minutes to a high degree of orientation. Analysis of the scatterin…
We directly visualize the response and relaxation dynamics of bipolar nematic liquid crystal droplets to an applied electric field E. Despite strong planar anchoring, there is no critical field for switching. Instead, upon application of E, the surface region first reorients, followed by movement of the disclinations…
Metal electrodes patterned lithographically on top of individual single-wall carbon nanotubes are used to gate the nanotubes with respect to a reference electrode in an electrolyte drop. The gating is found to have a dramatic effect on both the Raman spectra and electron transport of the nanotubes. Current through met…
Stimulated emission at bandgap energy of 1.1 eV was observed in a silicon nanostructured pn junction diode using current injection at room temperature. Nonuniform diffusion using spin-on boron dopant mixed with silicon dioxide nanoparticles was used to fabricate the device. The spatial confinement of carriers through…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFirst Redox Polymer Bearing One-Step Successive Two-Electron-Transfer Process Based on Redox Potential InversionToyohiko Nishiumi, Yuya Chimoto, Yuki Hagiwara, Masayoshi Higuchi, and Kimihisa YamamotoView Author Information Department of Chemistry, Faculty of Science & Technolo…
In this letter, we report the electrical properties of hollow polyaniline (PANI) microspheres. β-naphthalene sulfonic acid (NSA) and salicylic acid (SA) doped PANI microspheres were synthesized by a self-assembly method. The room-temperature conductivity is 8.6×10−2 S/cm for PANI–NSA microspheres (0.8–2 μm in outer di…
TiO 2 films were deposited by r.f. reactive magnetron sputtering on nonalkali glass without substrate heating using a 3-inch-φ magnetron cathode with various magnetic field strengths (MFS, 150–1000 G) and shapes (balanced or unbalanced) at a total gas pressure of 1.0 or 3.0 Pa. The crystallinity and photocatalytic act…
The adsorption of NO and NO 2 molecules at the BaO surface has been investigated by means of density functional theory (DFT) cluster model calculations. Regular adsorption sites at flat terraces have been compared with those on steps and corners. The properties of the adsorbed molecules have been monitored by computin…
An algorithm for automatic classification of protein crystallization images acquired from a high-throughput vapor-diffusion system is described. The classifier uses edge detection followed by dynamic-programming curve tracking to determine the drop boundary; this technique optimizes a scoring function that incorporate…