Materials Literature
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NO wird gebraucht: Das Moderieren der thermischen Zersetzung von trägerfixierten Nitraten mit NO (Graph) verhindert die Vorstufenmobilität und eignet sich zur Herstellung kleiner NiO- (links im Bild) und Co3O4-Partikel. Die so erhaltenen Materialien eignen sich als Heterogenkatalysatoren und zeigen eine gute Aktivität…
In the present work, we report the formation of Au nanorings on quartz substrate by thermal evaporation of Au on quartz and subsequent annealing in certain conditions as a function of metal volume fraction and annealing temperature. Optical extinction cross-sections measurements and atomic force microscopy (AFM) studi…
This paper aims at giving a better understanding of the reaction mechanisms involved in the heterogeneous deacetylation of beta-chitin in relation with the influence of soda concentration (30-55% (w/v)) and the type of sodium hydroxide hydrates formed in solution. The role of temperature (35-110 degrees C) and of the…
Abstract Crosslinked octadecene (OD) and maleic anhydride (MA) copolymer MA/OD (50 : 50 mol ratios) was prepared by condensation of the prepared linear copolymer with different glycols. Ethylene glycol and polyethylene glycols having different molecular weights were used as crosslinking agents. The crosslinked copolym…
Platinum nanocrystals with unusual shapes show unusually high catalytic activity, suggesting possible ways to enhance catalysis in other materials.
In this Rapid Communication we demonstrate the applicability of an augmented Gibbs ensemble Monte Carlo approach for the phase behavior determination of model colloidal systems with short-ranged depletion attraction and long-ranged repulsion. This technique allows for a quantitative determination of the phase boundari…
PEGged as soluble: Potassium graphite (C8K) is functionalized to yield derivatives that are soluble in either water or organic solvents. For example, treatment of C8K with 5-bromovaleric acid followed by amine-terminated poly(ethylene glycol) leads to water-soluble nanoplatelets (see AFM image).
The purpose of this study was to prepare human serum albumin (HSA) microspheres with Fe(3)O(4) magnetic nanoparticles for tumor target therapy. Fe(3)O(4) was obtained by liquid-phase coprecipitation; HSA-coated magnetic particles were attained by solidification at high temperature. The result was that nanosized Fe(3)O…
X-ray absorption spectroscopy (XAS) and x-ray photoemission spectroscopy of the V $L$ edge and O $K$ edge were performed on $\mathrm{V}{\mathrm{O}}_{2}$ thin films rf sputtered at various conditions. The spectra give evidence of the changes in the electronic structure depending on the film quality. XAS of the O $K$ ed…
The nanoparticles of gold and silver in solution state and supported over activated alumina are effective systems for the quantitative removal of chlorpyrifos and malathion, two common pesticides found in surface waters of developing nations, from water. In the solution phase, these pesticides adsorb onto the nanopart…
We present an overview of the simple and environmentally benign protocol we have developed recently, for the in situ generation of metal nanoparticles inside polymer films by mild thermal annealing, leading to free-standing as well as supported thin films of nanoparticle-embedded polymer. The fabrication chemistry is…
We report on electrical and thermal properties in the temperature range from $328\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}958\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ of multiwall carbon nanotube (MWNT) bulk materials that were consolidated by spark plasma sintering. The rather dense MWNT bulk mater…
One-dimensional (1D) polyaniline/tobacco mosaic virus (TMV) composite nanofibers and macroscopic bundles of such fibers were generated via a self-assembly process of TMV assisted by in-situ polymerization of polyaniline on the surface of TMV. At near-neutral reaction pH, branched polyaniline formed on the surface of T…
Abstract By manipulating processing conditions, three levels of exfoliation of synthetic α‐zirconium phosphate (α‐ZrP) nanoplatelets in epoxy matrices have been achieved. Transmission electron microscopy and wide angle X‐ray diffraction were utilized to confirm the three different levels of exfoliation of nanoplatelet…
We investigate sedimentation of model hard-sphere-like colloidal dispersions confined in horizontal capillaries using laser scanning confocal microscopy, dynamical density functional theory, and Brownian dynamics computer simulations. For homogenized initial states we obtain quantitative agreement of the results from…
The observation of superconductivity in the layered transition metal oxide NaxCoO2 y H2O (K. Takada et al., Nature 422, 53 (2003)) has caused a tremendous upsurge of scientific interest due to its similarities and its differences to the copper based high-temperature superconductors. Two years after the discovery, we r…
The nitrogen doped multiwalled carbon nanotubes (MWNTs) were synthesized by microwave plasma chemical vapor deposition (MPCVD) technique. In this paper, we report the results of FTIR, Raman, and TGA studies to confirm the presence of N-doping inside carbon nanotubes. Fourier transform infrared (FTIR) studies were carr…
The mechanism of carbon nanotube (CNT) nucleation and growth has been a mystery for over 15 years. Prior models have attempted the extension of older classical transport mechanisms. In July 2000, a more detailed and accurate nonclassical, relativistic mechanism was formulated considering the detailed dynamics of the e…
In planar nano-magnetic devices magnetization direction is kept close to a given plane by the large easy-plane magnetic anisotropy, for example by the shape anisotropy in a thin film. In this case magnetization shows effectively in-plane dynamics with only one angle required for its description. Moreover, the motion c…
In magnetic systems with dominating easy-plane anisotropy the magnetization can be described by an effective one dimensional equation for the in-plane angle. Re-deriving this equation in the presence of spin-transfer torques, we obtain a description that allows for a more intuitive understanding of spintronic devices'…