Materials Literature
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A semi-empirical relation which can be used to determine the total attenuation cross sections of samples containing H, C, N and O in the energy range 145 1332 keV has been derived based on the total attenuation cross sections of several sugars, amino acids and fatty acids. The cross sections have been measured by perf…
Liquid-crystal self-assembly is used to fabricate carbon nanoparticles specially suited for cell-delivery applications (see figure). The nanoparticles possess high-activity surfaces for easy functionalization and aqueous dispersion, and are shown to be rapidly internalized by mesothelial cells, wherein they show no me…
Sub-micrometer length copper fibers are obtained via polymer supported electrospinning and subsequent thermal treatment. The copper nature of the fibers is confirmed by using energy- dispersive X-ray analysis and wide- angle X-ray analysis (see figure). The copper fibers show metallic conductivity as confirmed by cond…
We investigate the dynamics of monodisperse colloidal polystyrene particles suspended in solutions of the semiflexible polymer filamentous actin, over a range of filament lengths that either exceed or are substantially less than the particle radius. The filament length is controlled by the capping protein gelsolin, an…
Comparable changes in the volume of RETe3 materials caused by temperature and RE size have opposite trends to the incommensurate charge density wave modulation. This is unique behavior among all reported charge density wave materials.
We demonstrate seedless synthesis of gold nanorods at high temperatures up to 97 degrees C. Using the correct silver nitrate concentration is crucial for formation of rod-shaped particles at all temperatures. We observed a decrease of nanorod length with increasing temperature, while the width stays constant throughou…
Designer jackets: Polydentate amino-functionalized poly(ethylene oxide)s with various block lengths are synthesized and used for ligand exchange and phase transfer of quantum dots and magnetic nanoparticles (see scheme; TEM images of the particles before and after the exchange are also shown). The ligands enable the t…
The enhanced local optical fields at the surface of illuminated metallic nanoparticles and nanostructures are of intense fundamental and technological interest. Here we report a self-consistent measurement of the spatial extent of the fringing field above a plasmonic nanoparticle surface. Bifunctional DNA-based adsorb…
Biogenic calcite obtained from different mollusk shells is subjected to heat treatments at elevated temperatures and structurally analyzed by high-resolution synchrotron X-ray powder diffraction. Remarkable broadening of diffraction peaks in samples annealed at temperatures above 200 °C is observed (see figure), indic…
We report the assembly of polyelectrolyte multilayer (PEM) films at the interfaces of thermotropic liquid crystal (LC) droplets dispersed in an aqueous phase. Exposure of PEM-coated droplets to surfactant slowed the bipolar-to-radial ordering transition of the LCs by 2 orders of magnitude relative to naked droplets. T…
The aqueous synthesis of thiol-stabilized semiconductor CdTe colloidal nanocrystals has been revisited. We found optimal conditions for the synthesis of high-quality CdTe NCs through a study of the influence of the initial conditions (structure and concentration of Cd-thiol complexes) on the quality of the CdTe nanocr…
A new procedure aimed at folding a two-dimensional powder diffraction pattern into a one-dimensional scan is presented. The sample-to-detector distance is the only parameter that, in this approach, needs to be adjusted in a separate step by using the `standard' sample. The technique consists of three steps: tracking t…
Reaction rates are often defined using classical statistics for introducing the thermal occupation probabilities. Its predictions for the temperature dependence of a rate are found in reasonable agreement with experiments. In view of the applications to polaronic systems at lower temperatures under strongly quantized…
A time-resolved fluoro-immunoassay (TR-FIA) format is presented based on resonance energy transfer from visible emitting lanthanide complexes of europium and terbium, as energy donors, to semiconductor CdSe/ZnS core/shell nanocrystals (quantum dots, QD), as energy acceptors. The spatial proximity of the donor-acceptor…
Hydrogen causes a reversible decrease in the resistance of a thin film of camphorsulfonic acid doped polyaniline nanofibers. For a 1% mixture of hydrogen in nitrogen, a 3% decrease in resistance is observed (DeltaR/R = -3%). The hydrogen response is completely suppressed in the presence of humidity. In contrast, oxyge…
Thin films of $\mathrm{Sn}{\mathrm{O}}_{2}$ prepared by pulsed-laser deposition on R-cut sapphire substrates exhibit ferromagnetic properties at room temperature when they are doped with Cr, Mn, Fe, Co, or Ni, but not with other $3d$ cations. Extrapolated Curie temperatures are generally in excess of $500\phantom{\rul…
3(5)-(9-Anthryl)pyrazole (ANP) can be used as a building block to construct different luminescent single crystals based on hydrogen bonding and π…π stacking interactions. Five types of single crystals—obtained by controlling the molecular assembly structures—that exhibit blue, blue-green, and green emission can be obt…
A family of soluble narrow band gap donor-acceptor conjugated polymers based on dioxythiophenes and cyanovinylenes is reported. The polymers were synthesized using Knoevenagel polycondensation or Yamamoto coupling polymerizations to yield polymers with molecular weights on the order of 10 000-20 000 g/mol, which posse…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry on Metal NanoparticlesKazuo Watanabe, Dietrich Menzel, Niklas Nilius, and Hans-Joachim FreundView Author Information Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6, 14195 Berlin, Germany and Fakultät für Physik E20, Technische Universität Münc…
The biodegradability and biocompatibility of ZnO wires in biofluid has been studied by investigating the interaction of the wires with deionized water, ammonia, NaOH solution, and horse blood serum. The results show that ZnO can be dissolved into mineral ions by these liquids within a few hours (see figure) and that Z…