Materials Literature
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We have developed a lithography-free, all-dry process for fabricating graphene devices using an ultrathin quartz filament as a shadow mask. This technique, which is free of the possible contamination of graphene during lithographic process, is simple to implement, versatile, and capable of achieving high throughput. W…
Abstract Remarkable improvements in enantioselectivity as well as recycle were observed in the catalytic asymmetric epoxidation of terminal alkenes with a chiral, electron‐poor platinum( II ) catalyst with hydrogen peroxide as terminal oxidant in water‐surfactant media.
A novel theoretical approach to the dynamics analysis of excitation and dephasing of plasmon modes in nanoparticles is presented. This approach is based on the biorthogonal plasmon mode expansion, and it leads to the predictions of time dynamics of excitation of specific plasmon modes as well as their steady state amp…
In the present study, a kind of SiCw/wax composite was prepared and its electromagnetic properties were studied experimentally. It is found that Mie resonance can occur in this composite in spite of its disordered structure. The Mie resonance is believed to lead to the resonant-antiresonant electromagnetic behavior ac…
Well-crystallized ZnO nanowires were grown in large quantity on aluminium foil, by a non-catalytic thermal evaporation method using metallic zinc powder in the presence of oxygen at low temperature. Detailed structural and optical characterizations confirmed that the as-grown nanowires were highly crystalline, possess…
Abstract The solubility of the assemblage corundum + kyanite in H 2 O was determined at 700°C and 10 kbar, using a piston‐cylinder apparatus and rapid‐quench/fluid‐extraction techniques. Weighted mean concentrations of total Al and Si were 5.80 ± 0.03 mmol kg −1 H 2 O and 0.308 ± 0.003 mol kg −1 H 2 O, respectively (1…
We report the electrical responses of water vapour and O 2 adsorption onto macroscopic multi-walled carbon nanotube (MWCNT) ropes, and compare the results with mats of acid-treated MWCNTs on SiO 2 substrates in order to investigate the importance of oxygen-containing defects on CNTs. In the outgassed state both carbon…
Extreme water repellency is greatly desired for anticontamination and self-cleaning applications. Aligned multiwalled carbon nanotube arrays exhibit superhydrophobic behavior but suffer from poor hydrophobic stability and contact angle hysteresis. In this work the authors selectively grow multiwalled nanotubes onto a…
Along came a spider…︁ Spider silk is a fascinating biomaterial owing to its strength, extensibility, and toughness per unit weight which is unrivaled by man-made fibers. The spinning of spider silk corresponds to a transition from a liquid phase to a solid thread. The underlying mechanism of this transition has been i…
Structural determinations of ammonia borane (BH3NH3) have been carried out for the orthorhombic (at 90 K) and tetragonal (at 298 K) modifications using single-crystal X-ray data. The orthorhombic structure (space group Pmn21) agreed with a previously published neutron determination, while the tetragonal structure (I4m…
A conductive distributed Bragg reflector (DBR) composed entirely of a single material—indium tin oxide (ITO)—is reported. The high- and low-refractive-index layers of the DBR are deposited by oblique-angle deposition and consist of ITO thin films with low and high porosities, which yield an index contrast of Δn=0.4. A…
The graphene is a native two-dimensional crystal material consisting of a single sheet of carbon atoms. In this unique one-atom-thick material, the electron transport is ballistic and is described by a quantum relativisticlike Dirac equation rather than by the Schrödinger equation. As a result, a graphene barrier beha…
The dielectric properties of CaCu3Ti4O12 were studied in the frequency range from 100Hzto100kHz at temperatures ranging from 23K to room temperature. The properties can be perfectly described by the so-called universal dielectric response, indicating that they are intimately related to the hopping conductivity caused…
Abstract Silver nanoparticles of 23 nm size were formed by chemical reduction of silver nitrate in excess of aqueous sodium borohydride. To examine the aggregation behavior in NaCl solutions, they were coated with poly(diallyldimethylammonium chloride), poly(allylamine hydrochloride) and poly(ethylene glycol) by layer…
Ba Ti 1 − x Ca x O 3 − x ceramics, where 0⩽x⩽0.04, prepared by the mixed oxide route at 1500°C display a strong suppression of the Curie temperature and a significant increase in grain conductivity with increasing x. The ramifications of these results on the applicability of using Ca2+ as a dopant to achieve X8R speci…
Abstract The isothermal crystallization behavior and the structure and morphology of isotactic poly(propylene) (iPP) and iPP/hydrogenated hydrocarbon resin (HR) 90/10 blend were analyzed. To cover the entire temperature range, isothermal crystallizations were studied using superfast calorimetry at a high cooling rate…
The authors present direct evidence for Te segregation to the grain boundaries in chalcogenide Ge2Sb2Te5 films by using transmission electron microscopy scans with a 0.5nm diameter focused probe. This finding is consistent with the observed impeded grain growth and with the post-transition relief of a “spikelike” stre…
We investigate the parallel scaling of the GROMACS molecular dynamics code on Ethernet Beowulf clusters and what prerequisites are necessary for decent scaling even on such clusters with only limited bandwidth and high latency. GROMACS 3.3 scales well on supercomputers like the IBM p690 (Regatta) and on Linux clusters…
Internal photoemission spectroscopy was used to determine the Schottky barrier height in rectifying SrRuO3∕Nb-doped SrTiO3 junctions for 0.01 and 0.5wt% Nb concentrations. Good agreement was obtained with the barrier height deduced from capacitance-voltage measurements, provided that a model of the nonlinear permittiv…
The electronic transport properties and switching mechanism of single photochromic diarylethene derivatives sandwiched between two gold surfaces with closed and open configurations are investigated by a fully self-consistent nonequilibrium Green's function method combined with density functional theory. The calculated…