Materials Literature
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Twist your tubes: The self-assembly of small organic molecules is an entirely new approach to the synthesis of nanotubular structures possessing helical chirality. Amino acid derivatives of naphthalenediimide form such assemblies both in solution and in the solid state. The chirality of the nanotubes is determined by…
The synthesis, characterization, and optical properties of high quality straight and branched CdTe nanowires (NWs) are described. A solution-based (solution−liquid−solid) approach is used to synthesize the NWs by employing a low melting bimetallic nanoparticle catalyst to induce one-dimensional (1D) growth. This lever…
In full color: Ultrafine lanthanide-doped polyvinylpyrrolidone/NaYF4 nanocrystals with narrow size distribution were synthesized and found to disperse well in water and many organic solvents. Silica was coated onto the nanocrystals to form a uniform thin layer. Highly efficient upconversion fluorescence was observed f…
Activity revived: Platinum nanoparticles (cuboctahedra, cubes, and porous particles, see picture, from left to right) capped with alkylammonium ions are synthesized by manipulating the reduction kinetics. The catalytic activity of these nanoparticles is superior to that of nanoparticles whose shape was controlled with…
Eine ganz neue Rolle: Wässrige Lösungen von OsO4 und NaIO4 oxidieren unter sehr milden Bedingungen Methan zu Methanol. Das gebildete Methanol liegt auch nach 5 Tagen bei 50 °C unverändert vor, obwohl es in getrennten Experimenten leichter oxidiert wird als Methan. Somit wird die Oxidation von Methanol durch OsO4/NaIO4…
Amorphous miscible PET/PC copolymers were prepared by blending the two constituent blend homopolymers at 50/50 wt% proportion in presence of cobalt acetylacetonate II and III (0.05 and 0.1 wt%) in the molten state. The reaction products were evaluated by solubility in methylene chloride (CH2Cl2), differential scanning…
The reaction of [{(C5Me5)CrCl2}2] with [2.2](1,4)cyclophane gave [(C5Me5)Cr{[2.2](1,4)cyclophane}] (1) and [(C5Me5)Cr{[2.2](1,4)cyclophane}Cr(C5Me5)] (2), depending on the reaction conditions. X-ray structure analysis showed 2 to be a ministack which in turn is stacked in the lattice. The chromium atoms are 6.035 A ap…
Incommensurate modulation structure in uniaxial relaxor ferroelectric Ca0.28Ba0.72Nb2O6 single crystals was investigated using transmission electron microscopy (TEM). The wave-modulation vector can be expressed as q=(1∕2)c*+(1+δ)(a*−b*)∕4, where the incommensurability parameter δ was determined to be about 0.09 from […
The electrical transport properties of individual disordered multiwalled carbon nanotubes (MWCNTs), synthesized with the floating catalyst method, have been investigated. The resistivity of such disordered MWCNTs shows T1∕2 dependence over a temperature range of 4.2–263K. The experimental finding can be interpreted in…
We present an investigation of the $[{\mathrm{Fe}}_{19}(\mathrm{metheidi}{)}_{10}(\mathrm{OH}{)}_{14}(\mathrm{O}{)}_{6}({\mathrm{H}}_{2}\mathrm{O}{)}_{12}]{\mathrm{NO}}_{3}∙24{\mathrm{H}}_{2}\mathrm{O}$ (henceforth ${\mathrm{Fe}}_{19}$) high spin magnetic molecular cluster, based on proton NMR measurements obtained in…
Both radiative and nonradiative relaxation rates for a series of rare-earth ions doped $20\mathrm{Ge}\text{\ensuremath{-}}5\mathrm{Ga}\text{\ensuremath{-}}10\mathrm{Sb}\text{\ensuremath{-}}65\mathrm{S}$ $(\mathrm{GeGaSbS})$ sulfide (chalcogenide) glasses have been determined. Temperature-dependent lifetimes were carri…
Magnetostriction and the electrical resistivities of as-cast and ⟨110⟩ oriented crystals of Tb0.3Dy0.7(Fe1−xSix)1.95 (x=0,0.025,0.1) were investigated. Giant magnetostriction and obvious magnetostrictive jump effect were observed in oriented Si doped TbDyFeSi crystals especially for x=0.025. The electrical resistiviti…
Imaging surfaces and interfaces with structural and chemical specificity has been essential for understanding a variety of phenomena occurring in adsorbed layers during surface chemical reactions. A recent achievement of chemical imaging with spectroscopic analysis is the experimental proof of theoretically predicted…
A sample of Ni0.25Co0.25Zn0.5Fe2O4 ferrite was prepared by a double-staged sintering method in air. Thermoplastic natural rubber (TPNR) was prepared by melt blending of natural rubber (NR), liquid natural rubber (LNR), and high density polyethylene (HDPE) in an internal mixer Brabender Plasticorder PL 2000. Magnetic p…
A method for visualizing ferroelectric domain walls based on higher order nonlinear dielectric detection is proposed. This technique enables the authors to obtain information to visualize the domain wall clearly. Using this method, nanodomain variations with high temperature treatments are observed. The results indica…
A simple fabrication technique for anisotropic particles of ellipsoidal/discoidal shape has been developed, based on stretching/compressing of oil-in-water emulsion templates embedded into an elastic aqueous gel; a range of solid anisotropic microparticles have been fabricated by polymerising of the deformed oil drops…
The enhancement in light extraction efficiency from a periodic micron-scale rugged surface pattern on Si quantum dot light-emitting-diode (Si-QD LED) structures was investigated, both numerically and experimentally. Micron-scale rugged surface patterns were fabricated on the top layer of the Si-QD LED to increase the…
Individual carbon nanotube electron field emitters with good controllability have been fabricated in a two-step process involving (a) producing micron-size carbon fibers which contain single carbon nanotubes at their cores by a chemical vapor deposition method and (b) exposing the nanotubes by fracturing the fiber wit…
Electron beam induced current (EBIC) is often used to evaluate minority carrier properties in semiconductors. Various mathematical models have been proposed; the most advanced is that of Bonard and Ganière [J. Appl. Phys. 79, 6987 (1996)]. However, in order to apply this model to EBIC experiments, the lateral and dept…
The layer structures in bent-shaped liquid crystal dimers mOAM5AMOm (m=6-16) have been investigated by x-ray microbeam diffraction. These liquid crystal molecules have two rodlike mesogens connected with an odd-numbered alkylene spacer and form a bent shape. In these compounds it is found that the structure changes fr…