Materials Literature
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The morphology and topography of self-assembled nanoripple structures on LaAlO3 (100) surface with and without carbon coating were characterized using focused ion beam (FIB)/scanning electron microscope, as well as ex situ atomic force microscopy and transmission electron microscopy. When the surface was not covered b…
We report the direct measurement of electrical transport through rod-like polymer molecules, of poly(ethyl propiolate) (PEP), utilizing single walled carbon nanotubes (SWNTs) as electrodes. The electrical properties of the devices were measured (i) before cutting a SWNT, (ii) when a SWNT was cut and (iii) after PEP de…
We investigated the temperature-dependent transport properties of Pt/Nb-doped SrTiO3 junctions, exhibiting rectifying and hysteretic behaviours. The conventional Schottky diode model failed to explain the current–voltage characteristics, since the estimated Richardson constant was too small. The temperature dependence…
Abstract U wie ungewohnt: Der Austausch von C5Me5 gegen einen „weichen“ PNP‐ Pinzettenliganden mit besonderen elektronischen und sterischen Eigenschaften erzeugte neue Reaktivitäts‐ und Strukturmuster in der Actinoidenreihe (siehe Bild, py–O=Pyridin‐N‐oxid). Die neuen Liganden unterstützen nicht nur niedervalente Uran…
A highly enantioselective catalytic epoxidation reaction to the electron-deficient α,β-unsaturated olefin moieties of diarylenones was achieved with high chemical yield by using aqueous hydrogen peroxide in the presence of a newly developed guanidine-urea bifunctional organocatalyst. These functional groups were sugg…
The rational design of peptide and protein helices is not only of practical importance for protein engineering but also is a useful approach in attempts to improve our understanding of protein folding. Recent modifications of theoretical models of helix-coil transitions allow accurate predictions of the helix stabilit…
We present the room temperature magnetization hysteresis loop measurements of a triangularly shaped Fe64Ni36 dot array with the feature size down to 30 nm using magneto-optical Kerr effect. An in-plane anisotropic magnetization reversal and an enhanced coercivity have been observed in these magnetic dots. In combining…
The authors simulated, fabricated, and characterized a mushroomlike composite metallodielectric nanostructure that shows improved characteristics for surface plasmon resonance sensing applications with an enhancement in the normal electric field compared to the conventional nanohole structure. A fabrication method is…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTConvenient Synthesis of Functional Polyfluorenes via a Modified One-Pot Suzuki−Miyaura Condensation ReactionRyan M. Walczak†‡, Robert N. Brookins†, Alice M. Savage†, Eveline M. van der Aa†, and John R. Reynolds*†View Author Informat…
A quasi-solid-state dye-sensitized solar cell employing a poly(ethylene oxide)-poly(vinylidene fluoride) (PEO-PVDF)/TiO2 gel electrolyte modified by various concentrations of water and ethanol is described. It is shown that the introduction of water and ethanol prevents the crystallization of the polymer matrix, and e…
Nitriding of specimens with the composition Fe–1.5 wt% Cr–1.5 wt% Al (Fe–1.6 at.% Cr–3.1 at.% Al) at 853 K leads to the formation of mixed, ternary Cr1− x Al x N nitride platelets precipitated in the cubic, rock-salt structure type obeying a Bain-type orientation relationship with the ferrite matrix. Upon subsequent a…
Abstract Aufgemotzte Polymere: Ein vielseitiges und stark emittierendes konjugiertes Polymergerüst wird erhalten, wenn Nucleophile labile Bromatome am Rückgrat eines Fluorenylboran‐Polymers ersetzen (siehe Bild). Durch solche einfachen Modifizierungen lassen sich die Stabilität sowie das thermische und photophysikalis…
We demonstrate that 3,6-difluoro-2,5,7,7,8,8-hexacyanoquinodimethane (F2-HCNQ) can serve as an excellent electrical doping material for hole transport materials with the highest occupied molecular orbital level as high as 5.4 eV, such as N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB). With its relatively stro…
Abstract Ein Minimalmodell für die SNARE‐vermittelte Fusion biologischer Membranen wurde entwickelt. Die Fusion zwischen zwei Populationen von Liposomen wird durch ein Paar komplementärer lipidierter Oligopeptide gelenkt, die nichtkovalente doppelt gewendelte Komplexe bilden und dadurch die Membranen in unmittelbare N…
We prepared four new ionic liquids consisting of N -methyl- N -allylpyrrolidinium cation in conjunction with anions including iodide, nitrate, thiocyanate, and dicyanamide, respectively, and measured their physical properties of density, viscosity, and conductivity. Owing to the relatively lower melting point of elect…
The Tetrahymena group I intron recognizes its oligonucleotide substrate in a two-step process. First, a substrate recognition duplex, called the P1 duplex, is formed. The P1 duplex then docks into the prefolded ribozyme core by forming tertiary contacts. P1 docking controls both the rate and the fidelity of substrate…
Conformational change is regulating the biological activity of a large number of proteins and enzymes. Efforts in structural biology have provided molecular descriptions of the interactions that stabilize the stable ground states on the reaction trajectories during conformational change. Less is known about equilibriu…
The vapor pressures of solid AlF 3 and AlCl 3 were measured by the torsion-effusion method. Their temperature dependences fit the following equations: log( p /kPa) = (11.70 ± 0.20) − (14 950 ± 200)( T /K) (from (956 to 1113) K) and log( p /kPa) = (15.50 ± 0.30) − (6200 ± 200)( T /K) (from (321 to 378) K) for AlF 3 and…
We investigated [0001] bare and functionalized gallium nitride (GaN) nanowires by using the density-functional theory. Passivation of GaN nanowires with various functional groups (H, NH2, OH, and SH) show distinct electronic properties. We found that the band gap for the nanowires with partial surface coverage is depe…
We propose schemes of reversing the magnetization of a ferromagnet by electric fields alone, without charge or spin currents or external magnetic fields. The switching is triggered by picosecond manipulation of the atomic positions or subpicosecond distortion of the valence charge distribution, which through spin-orbi…