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Bunyod Allabergenov,김성진 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Copper-carbon composites are attractive materials for electrical applications, such as contact strips for pantographs and collector shoes in electric railways and brushes for motor technology. Because the copper-carbon composites combine the positive characteristics of both components, i.e. thermal and electrical conductivity from the copper and low thermal expansion coefficient and resistivity properties from the carbon. In this report the porous copper-carbon composite material with optimal ratio was prepared and electrophysical, mechanical characteristics were investigated. The specimens were sintered by spark plasma sintering technique which allowed preparing the specimens for short time. The copper-carbon composites samples were prepared with using additional sodium oleate and sodium chloride admixtures for making porous structure. The sintering pressure and temperature are one of the important parameter which influences the properties of the specimens. After sintering for making porous structure the prepared composite samples were treated in boiled deionized water where remained organic materials dissolved in liquid solution. It was shown that the physical, mechanical, electrical properties and porosity degree are directly depends from the initial size of the powders, and material composition. In particular, at different pressure, and applying the optimal copper-carbon ratio (Cu-C) was fabricated porous samples from copper-derived composites where used carbon source and electrolytic grade copper powder. The structural and composition parameters and the obtained composite samples fabricated by spark plasma sintering technique have been investigated by micro-hardness tester, hall system, density tester, optical microscope, XRD and FE-SEM
Synthesis, Characterization and Functionalization of the Coated Iron Oxide Nanostructures
Tursunkulov, Oybek,Allabergenov, Bunyod,Abidov, Amir,Jeong, Soon-Wook,Kim, Sungjin The Korean Powder Metallurgy Institute 2013 한국분말재료학회지 (KPMI) Vol.20 No.3
The iron oxides nanoparticles and iron oxide with other compounds are of importance in fields including biomedicine, clinical and bio-sensing applications, corrosion resistance, and magnetic properties of materials, catalyst, and geochemical processes etc. In this work we describe the preparation and investigation of the properties of coated magnetic nanoparticles consisting of the iron oxide core and organic modification of the residue. These fine iron oxide nanoparticles were prepared in air environment by the co-precipitation method using of $Fe^{2+}$: $Fe^{3+}$ where chemical precipitation was achieved by adding ammonia aqueous solution with vigorous stirring. During the synthesis of nanoparticles with a narrow size distribution, the techniques of separation and powdering of nanoparticles into rather monodisperse fractions are observed. This is done using controlled precipitation of particles from surfactant stabilized solutions in the form organic components. It is desirable to maintain the particle size within pH range, temperature, solution ratio wherein the particle growth is held at a minimum. The iron oxide nanoparticles can be well dispersed in an aqueous solution were prepared by the mentioned co-precipitation method. Besides the iron oxide nanowires were prepared by using similar method. These iron oxide nanoparticles and nanowires have controlled average size and the obtained products were investigated by X-ray diffraction, FESEM and other methods.
Damir M. Rozibakiev,Umidbek A,Allabergenov KINFORMS 2015 Management Review Vol.10 No.1
At present though the market of geosynthetic materials as that in Uzbekistan also doesn t exist but projects in which it is supposed to use geosynthetic materials already began to appear. Being based on the analysis of world experience, it is possible to argue with confidence that in the next two-three years the situation in a root will change and geosynthetics will gain popularity. In article is carried out research and the analysis of the market of geosynthetic materials and also ways of increase of demand for geosynthetics
Damir M.Rozibakiev,Umidbek A.Allabergenov 한국로고스경영학회 2013 한국로고스경영학회 학술발표대회논문집 Vol.2013 No.5
At present though the market of geosynthetic materials as that in Uzbekistan also doesn"t exist but projects in which it is supposed to use geosynthetic materials already began to appear. Being based on the analysis of world experience, it is possible to argue with confidence that in the next two-three years the situation in a root will change and geosynthetics will gain popularity. In article is carried out research and the analysis of the market of geosynthetic materials and also ways of increase of demand for geosynthetics.
Switchable Response of Ferroelectric Nanoparticle Doped Polymer-Dispersed Liquid Crystals
Shim, Hyunseok,Lyu, Hong-Kun,Allabergenov, Bunyod,Garbovskiy, Yuriy,Glushchenko, Anatoliy,Choi, Byeongdae American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>In this study, we doped polymer-dispersed liquid crystals (PDLCs) with barium titanate (BaTiO3, BTO) nanoparticles to investigate the effects of particle size on the electro-optical properties of the suspensions, such as the driving voltage and response time. We mixed BTO nanoparticles having various sizes of 8 nm, 20 nm, and 2 mu m, and liquid crystals (LCs) (E7) prior to blending the LCs and pre-polymers (NOA 65). We fabricated the PDLC films using the polymerization-induced phase-separation (PIPS) method. The film surface was irradiated with UV (365 nm) light for 3 min to induce phase separation between the LC and the polymer. According to the results, the 10% transmittance voltage (V-10) improved from 18.2 V to 6.8 V by the addition of 0.3 vol% of 8 nm BTO particles to the PDLC. The response time also decreased from 15.2 ms to 8.4 ms. Smaller particles were distributed more uniformly within the sample, which resulted in a reduction of the V-10 and response time of the PDLCs. The results obtained imply that nanoscale ferroelectric particle doping is a powerful tool to tune electro-optical properties of liquid crystals based systems, including improving the electrical performances without compromising other important characteristics, such as the haze of the PDLC devices.</P>
Shaislamov, U.,Krishnamoorthy, K.,Kim, S.J.,Abidov, A.,Allabergenov, B.,Kim, S.,Choi, S.,Suresh, R.,Ahmed, W.M.,Lee, H.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.4
<P>In this study, we demonstrated a facile fabrication of highly stable CuO/ZnO nanorod-nanobranch based photocathode for photoelectrochemical hydrogen generation. Primary CuO nanorods (serving as a trunk) were synthesized via direct thermal oxidation of Cu nanorods that were grown by a template assisted electrodeposition method. Secondary ZnO nanobranches were uniformly grown on the entire surface of CuO nanorods via hydrothermal method. The prepared CuO/ZnO nanorod-nanobranch photoelectrode demonstrated an extremely high stability of 90% during a long term stability measurement. Morphological, optical and electrochemical characterizations have been carried out in order to understand the effects of ZnO nanorod branches on the overall electrochemical performance of the electrode. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>