Suchergebnisse

The core-shell morphology study is crucial for composite materials, comprised of a low conductive core with a highly conductive thin carbon shell. The study analyzed carbon morphology evolution for the two series of Li4Ti5O12/C samples with carbon content increasing from 0.9 to 5.6 wt%. The conventional X-Ray Photoelectron Spectroscopy (XPS) study allowed us to conclude about the efficiency threshold of carbon layer growth over lithium titanate core for two carbon deposition methods - both sucrose and acetylene decompositions. Although the carbon layer thickness is increasing with carbon concentration growth in LTO/C composites, the efficiency of carbon coverage was shown to decrease with the threshold carbon concentrations about 1-2%. The chemical bonding analysis based on the same XPS data was used for C@LTO interface characterization. The proposed approach can be used for optimization of producing different composites with core-shell structure (carbon-based composites, materials with protective layers, and materials with gradient core-shell structure). © The Author(s) 2018. Published by ECS. ; This work was performed within the state task no. 3.6115.2017/8.9 of the Ministry of Education and Science of the Russian Federation and supported by Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006). The equipment of the Ural Center for Shared Use "Modern Nanotechnology" UrFU and JSC Eliont were used. Authors thanks Vasily Lebedev and Alexander Esin for fruitful discussions.

In this report, we present a detailed study of the formation of alumina nanostructures at the surface of aluminium plate by hot water treatment (HWT) at various temperatures. The nanostructures were studied by scanning electron microscopy. The superhydrophilic property of the treated surface was revealed and its stability was investigated. It was shown that HWT could be used also for synthesis of the aqueous suspensions of alumina nanoparticles. It is proposed that the method can be applied for production of surface nanostructures and nanoparticles of various metal oxides. © Published under licence by IOP Publishing Ltd. ; Government Council on Grants, Russian Federation ; Ministry of Science and Higher Education of the Russian Federation: 3.4993.2017/6.7, 3.9534.2017/8.9 ; Ural Federal University, UrFU: 2.2.2.17.D-18/36 ; E.A.M. acknowledges the support from the Ural Federal University (grant for young scientist No. 2.2.2.17.D-18/36). The work has been supported in part by the Ministry of Science and Higher Education of the Russian Federation (projects 3.9534.2017/8.9 and 3.4993.2017/6.7) and by Government of the Russian Federation (act 211, agreement 02.A03.21.0006). The equipment of the Ural Centre for Shared Use "Modern Nanotechnology" Ural Federal University was used.

Production of non-spherical crystalline nanoparticles by laser ablation in liquid has been demonstrated recently. Here we studied the shape variety of PbO nanoparticles prepared by laser ablation in deionized water and IPA. The key role of water in the formation of PbO non-spherical nanostructures was demonstrated. Only spherical nanoparticles have been obtained in isopropyl alcohol (IPA). PbO non-spherical nanostructures have been formed only in presence of water, which supports the growth mechanism by oxidation. Using mixture of IPA and water in various proportions and revealing the time and temperature dependences of non-spherical nanostructure morphology can be used for controlled growth of PbO non-spherical nanostructures. © Published under licence by IOP Publishing Ltd. ; Government Council on Grants, Russian Federation ; Ministry of Science and Higher Education of the Russian Federation: 3.4993.2017/6.7, 3.9534.2017/8.9 ; The work has been supported in part by the Ministry of Science and Higher Education of the Russian Federation (projects 3.9534.2017/8.9 and 3.4993.2017/6.7) and by Government of the Russian Federation (act 211, agreement 02.A03.21.0006). The equipment of the Ural Centre for Shared Use "Modern Nanotechnology" Ural Federal University was used.