Materials Literature
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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…
A new integrated approach to full powder diffraction pattern analysis is described. This new approach incorporates wavelet-based data pre-processing, non-parametric statistical tests for full-pattern matching, and singular value decomposition to extract quantitative phase information from mixtures. Every measured data…
A comparison has been carried out of different methods of X-ray diffraction-line profile analysis for the determination of crystallite sizes and microstrains, namely the integral breadth method and three methods based on Fourier analysis of diffraction lines, namely the Warren–Averbach method, an `alternative method'…
In high-throughput crystallography, it is possible to accumulate over 1000 powder diffraction patterns on a series of related compounds, often polymorphs. A method is presented that can analyse such data, automatically sort the patterns into related clusters or classes, characterize each cluster and identify any unusu…
The dynamic structure factor $S(Q,\ensuremath{\omega}),$ of vitreous silica, has been measured by inelastic x-ray scattering in the exchanged wave-vector (Q) region $Q=4--16.5{\mathrm{nm}}^{\ensuremath{-}1}$ and up to energies $\ensuremath{\Elzxh}\ensuremath{\omega}=115\mathrm{meV}$ in the Stokes side. The unprecedent…
Solid spider dragline silk is well-known for its mechanical properties. Nonetheless a detailed picture of the spinning process is lacking. Here we report NMR studies on the liquid silk within the wide sac of the major ampullate (m.a.) gland from the spider Nephila edulis. The resolution in the NMR spectra is shown to…
By using the in-situ reflection−absorption infrared technique, the glass transition temperatures of poly(ethylene terephthalate) thin films were determined by detecting the abrupt change in the absorbance ratio of two comparable bands at 1340 cm -1 (trans conformation) and 1370 cm -1 (gauche conformation) during heati…
A miniature x-ray tube is described. The tube is made of Kovar, inside which a grounded target is located close to a field-electron emitter consisting of aligned carbon nanofibers, which continues to work for around 100 h in the 10−6 Pa region unless arcing is induced between the electrodes. The resolution of the cont…
Thin films of molybdenum-doped indium oxide, an n-type transparent conducting oxide, were deposited on glass substrates by a large-area deposition technique, radio-frequency magnetron sputtering, and their electrical properties were examined. Molybdenum content was varied from 1 to 4 wt%, and the highest mobility achi…
Mn-doped ZnS nanobelts have been prepared through a thermal evaporation method starting with a mixture of acetylacetonates and H2S at 900 °C. The nanobelts had a uniform single-crystal hexagonal wurtzite structure and grew along [001] direction. Undoped ZnS nanobelts and ZnMnS nanobelts with 1%, 3%, and 5% Mn so obtai…