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631.
M. D��az L. Mart��nez M. M. Ruano D. Llamosa P E. Rom��n M. Garc��a-Hernandez C. Ballesteros R. Fermento A. Cebollada G. Armelles Y. Huttel 《Journal of nanoparticle research》2011,13(10):5321-5333
We present a morphological, structural, and magnetic characterization of Co nanoparticles (mean diameter of 10.3 ± 1.8 nm) grown using a gas aggregation source and embedded in a silicon oxide matrix by sequential deposition of nanoparticles and silicon oxide. We show that the Co nanoparticles ??soft-land?? on the substrates and suffer a moderate oxidation in contact with the silicon oxide. Despite this moderate oxidation, it is found that, at room temperature, the magnetic volume of the resulting nanoparticles is below the superparamagnetic limit. The results presented in this article are compatible with the presence of an assembly of magnetically independent particles that also display a moderate exchange bias at low temperature. 相似文献
632.
Marta Kruszynska Holger Borchert J��rgen Parisi Joanna Kolny-Olesiak 《Journal of nanoparticle research》2011,13(11):5815-5824
CuInS2 (CIS) nanocrystals were successfully synthesized through a hot-injection technique employing a reaction of copper (I) acetate and indium (III) acetate with tert-dodecanethiol as a source of sulfur, and trioctylphosphine oxide and 1-dodecanethiol were used as ligands. The reaction medium was a mixture of two solvents: oleylamine and 1-octadecene. Varying the ratio between both solvents leads to the formation of wurtzite CuInS2 particles with shapes ranging from triangular to rod-shaped with length up to 50 nm. Oleylamine turned out to influence the reaction condition in two opposite ways: by leading to monomer depletion before the injection of the sulfur precursor, and at the same time increasing the activity of the monomers remaining in solution. By changing the sulfur source from tert-dodecanethiol to sulfur dissolved in oleylamine, triangular particles with zinc blend structure and a smaller size (~5 nm) were synthesized. The final materials were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and absorption spectroscopy (UV?CVis). 相似文献
633.
M. Fichtm��ller A. Lorek J. Wess 《The European Physical Journal C - Particles and Fields》2011,71(1):533-537
A q-deformed two-dimensional phase space is studied as a model for a noncommutative phase space. A lattice structure arises that can be interpreted as a spontaneous breaking of a continuous symmetry. The eigenfunctions of a Hamiltonian that lives on such a lattice are derived as wavefunctions in ordinaryx-space. 相似文献