Materials Literature
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We report manipulation of a Kondo resonance originated from the spin-electron interactions between a two-dimensional molecular assembly of TBrPP-Co molecules and a Cu(111) surface at 4.6 K using a low temperature scanning tunneling microscope. By manipulating nearest-neighbor molecules with a scanning tunneling micros…
We investigate a new generation of fullerene nano-oscillators: a single-walled carbon nanotube with one buckyball inside with an operating frequency in the tens-of-gigahertz range. A quantitative characterization of energy dissipation channels in the peapod pair has been performed via molecular dynamics simulation. Ed…
We discovered a new class of topological crystals, namely linked rings of crystals. Two rings of tantalum triselenide (TaSe3) single crystals were linked to each other while crystal growing. The topology of the crystal form is called a "Hopf link", which is the simplest link involving just two component unknots linked…
In chemical crosslinking of gelatin solutions, two different time scales affect the kinetics of the gel formation in the experiments. We complement the experimental study with Monte Carlo numerical simulations of a lattice model. This approach shows that the two characteristic time scales are related to the formation…
We extend the model of ferromagnetic superexchange in dilute magnetic semiconductors to the ferromagnetically ordered highly insulating compounds (dilute magnetic dielectrics). The intrinsic ferromagnetism without free carriers is observed in oxygen-deficient films of anatase ${\mathrm{TiO}}_{2}$ doped with transition…
Wiederbelebte Aktivität: Platinnanopartikel (Kuboktaeder, Würfel und poröse Partikel, im Bild von links nach rechts) mit Alkylammoniumionen als Bedeckung sind durch Manipulation der Reduktionskinetik zugänglich. Diese Nanopartikel sind katalytisch aktiver als Nanopartikel, deren Form mithilfe von Polymeren und anderen…
The magnetoelastic coupling in multiferroic $\mathrm{Dy}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ is investigated by magnetostriction measurements along the three crystallographic orientations. Strong lattice anomalies as a function of the magnetic field are detected at the low temperature magnetic and ferroelectric phase tr…
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…