Morphology of Nanostructured Alumina and Lanthana Synthesized with the Use of Fibrous Organic Matrix

Fibrous aluminum oxide γ-Al2O3 and lanthanum sesquioxide A-type La2O3 were synthesized by the thermal decomposition (700 °C, air) of cotton fibers impregnated by aqueous solutions of corresponding nitratesalts. The fibers of alumina consist of 20 nm sized particles, while the particle size of the lanthana ranges within 100–150 nm. The formation of chemisorption products on the lanthana surface is alsodiscussed. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3504

Detonation synthesis nanodiamonds for reinforcing metal matrix composite coatings operated under shock load

The paper is about the development of the coating from metal matrix composites with nanodiamond reinforcing particles to be applied for hard conditions including shock impacts. The main problem of using nanodiamonds in production of composites is their agglomeration, i.e., aggregation of primary nanodiamond particles 4–6 nm in size into agglomerates of up to 100 nm to 10 μm. Application of mechanical alloying for producing composites allows to obtain uniform distribution of separate initial nanodiamond particles inside copper matrix. Friction plating was applied for deposition of composite coatings. Deformation tests show that coatings applied by friction plating have high adhesion to substrate

In situ study of multi phase indium nanoparticle growth on into CuPcF4 organic thin film in ultra high vacuum conditions

We study the in-situ growth of a nanocomposite material consisting of a thin CuPcF4 film and multiphase/multidimensional indium nanoparticles, self-organizing on the surface and in the bulk, at various stages of thermal deposition of metal on an organic film under ultrahigh vacuum conditions. The analysis of high-resolution transmission electron microscopy (HR-TEM) images provided valuable information about the evolution of morphology, size, density, and distribution of indium nanoparticles upon indium deposition. These 2D/3D ultra-small nano-objects turned out to have not only body-centered tetragonal (bct) crystal structure, typical for bulk indium, but also unusual face-centered cubic (fcc) one. Using a synchrotron facility, the study of the electronic structure of the hybrid nanocomposite on variable stages of metal deposition was performed by XPS and NEXAFS. Core-level spectra related to the organics indicated reasonably weak chemical interaction of indium with CuPcF4 molecules, which is not the case for a number of metal/organic semiconductor systems, while valence band spectra have shown a considerable change of the material electronic properties. The energy level diagrams, derived from the experiment, can be applied for the creation of new prototypes of metal-organic memory devices

Supercurrents Through Single-Walled Carbon Nanotubes

International audienceProximity-induced superconductivity in single-walled carbon nanotubes below 1 kelvin, both in a single tube 1 nanometer in diameter and in crystalline ropes containing about 100 nanotubes, was observed. The samples were suspended between two superconducting electrodes, permitting structural study in a transmission electron microscope. When the resistance of the nanotube junction is sufficiently low, it becomes superconducting and can carry high supercurrents. The temperature and magnetic field dependence of the critical current of such junctions exhibits unusual features related to their strong one-dimensional character

Superconductivity and normal state resistance of carbon nanotubes

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