Materials Literature
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An innovative process to uniformly incorporate dispersed nanoscale ceramic inclusions within a polymer matrix was demonstrated. Micron‐sized high density polyethylene particles were coated with ultrathin alumina films by atomic layer deposition in a fluidized bed reactor at 77°C. The deposition of alumina on the polym…
Abstract ZnO–CuO nanostructures have been simultaneously synthesized by directly heating a CuZn alloy (brass) on a hotplate in ambient conditions. Depending on the Zn concentrations in the brasses, the dominant products transition from CuO nanowires to ZnO nanostructures. By changing the growth temperature and local Z…
We have developed a scaled parametric equation of state to describe and predict thermodynamic properties of supercooled water. The equation of state, built on the growing evidence that the critical point of supercooled liquid-liquid water separation exists, is universal in terms of theoretical scaling fields and is sh…
Poly(o-toluidine) hollow spheres with controllable size (see figure) are synthesized in aqueous solution by the droplet template formed by the monomer itself. The size of the hollow spheres and the size of the hole in the surface of each sphere are affected by the concentration of o-toluidine and the molar ratio of in…
Farbenvielfalt: Ultrafeine Lanthanoid-dotierte Polyvinylpyrrolidon/NaYF4-Nanokristalle mit enger Größenverteilung wurden synthetisiert, die in Wasser und vielen organischen Lösungsmitteln gut dispergiert sind. Diese Nanokristalle wurden mit einer gleichförmigen, dünnen Siliciumoxid-Hülle versehen. Umhüllte wie auch ni…
Thermopower, resistivity, and heat capacity have been measured on eight Sn-substituted ${\mathrm{FeSb}}_{2\ensuremath{-}x}{\mathrm{Sn}}_{x}$ samples with $x=0--0.15$. A giant peak in the low temperature thermopower of ${\mathrm{FeSb}}_{2}$ is observed and is similar to what is found in the Kondo insulator $\mathrm{FeS…
While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to stoichiometry and defect concentration, the NZTE mechanism remains elusive. We present x-ray absorption spectra that show unequivocally that Yb is nearly divalent in YbGaGe and the valence does not change with temperature or with nominally 1% B or 5% C…
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…