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Your search keyword '"Allabergenov, Bunyod"' showing total 33 results
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33 results on '"Allabergenov, Bunyod"'

8. Switchable Response of Ferroelectric Nanoparticle Doped Polymer-Dispersed Liquid Crystals

Author

Shim Hyunseok, Choi Byeongdae, Garbovskiy Yuriy, Glushchenko Anatoliy, Lyu Hong‐Kun, and Allabergenov Bunyod

Subjects
chemistry.chemical_classification, Materials science, Doping, Biomedical Engineering, Nanoparticle, Bioengineering, 02 engineering and technology, General Chemistry, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Ferroelectricity, 0104 chemical sciences, chemistry, Chemical engineering, Liquid crystal, General Materials Science, 0210 nano-technology
Published
2016
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24. Mechanical properties of stainless steel composites with titanium carbonitride consolidated by spark plasma sintering.

Author

Allabergenov, Bunyod, Tursunkulov, Oybek, Abidov, Amir, Jeong, Soon-Wook, and Kim, Sungjin

Subjects
*STAINLESS steel, *METALLIC composites, *TITANIUM compounds, *SINTERING, *EFFECT of temperature on metals, *MECHANICAL properties of metals
Abstract

In this paper, stainless steel–titanium carbonitride-based composites were fabricated and analyzed to utilize for bipolar plate in fuel cells. In order to study the size effect of titanium carbonitride on the mechanical and corrosion resistance properties of the composites, micro and nanosize titanium carbonitride powders were used. Stainless steel–carbonitride composites were prepared by spark plasma sintering and subsequently annealed at different temperatures up to 1100℃ to improve the morphological and mechanical properties. Various properties of the obtained samples were compared before and after annealing. It was shown that after heat treatment, the mechanical properties of the stainless steel–carbonitride composites improved due to the diffusion of titanium carbonitride particles into stainless steel. Addition of microsized titanium carbonitride powders was found to be effective to improve the mechanical properties, such as microhardness and compressive strength, of the composite. However, addition of nanosized titanium carbonitride powders led to an increase of corrosion resistivity of the composite. Physical properties, such as thermal and chemical stability of the obtained composite samples were investigated by microhardness tester, potentiostat, field emission-scanning electron microscope, EDX and X-ray diffraction. [ABSTRACT FROM AUTHOR]

Published
2016
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31. Study on Ag modified TiO2 thin films grown by sputtering deposition using sintered target.

Author

Abidov, Amir, Allabergenov, Bunyod, Jeonghwan Lee, Gómez-Solís, Christian, Juárez-Ramírez, Isaías, and Sungjin Kim

Subjects
*TITANIUM dioxide, *THIN films, *CRYSTAL growth, *SPUTTER deposition, *SINTERING, *X-ray photoelectron spectroscopy, *PHYSICAL vapor deposition, *SILVER compounds
Abstract

Ag modified thin films were grown by sputtering method using Ag/TiO2 target. Target was sintered using Spark Plasma Sintering (SPS) method from Ag and TiO2 powders. Sputtering was done on glass at room temperature using RF magnetron sputter. After deposition samples were calcined at 300 °C, 400 °C and 500 °C in order to obtain tetragonal structure, particularly anatase. Crystal structure properties were investigated using X-ray Diffractometry (XRD). X-ray Photoelectron Spectrophotometer (XPS) was used to analyze chemical composition and ionic state of elements in deposited films. Optical properties of obtained films were determined by UV-visible absorbance spectrophotometer. It was found that 300 nm thick films calcined at 500 °C improved the photocatalytical properties for photodegradation of Rhodamine B (RhB). [ABSTRACT FROM AUTHOR]

Published
2014
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32. Effect of TiH2 Composition on Porous Stainless Steel and Titanium Hydride Composite Synthesized by Spark Plasma Sintering

Author

Allabergenov, Bunyod, Tursunkulov, Oybek, Abidov, Amir, Kim, Sang Youp, Lee, Eun Young, He, Li Li, Kim, Tae Yong, Jeong, Soon Wook, and Kim, Sung Jin

Abstract

The main aim of this research was to investigate the influence of processing parameters on the me-chanical properties and morphology of porous STS:TiH2 composites made by using spark plasma sintering method. Mechanical parameters and structural analysis of the fabricated composite have been investigated by Rockwell hardness, density tester, optical microscope, XRD and FE-SEM. In particular the porous stainless steel (STS) and titanium hydride TiH2 composites materials with op-timal ratio were prepared with using additional hollow glass microsphere and water glass for con-trolling of the porosity degree. It is found, that the porosity degree depended on addition of TiH2 and hollow glass additive, resulting to modification of the pore shape and size. I was shown that the dispersion of STS/TiH2 composite which sintered by spark plasma sintering method without pressure result to increasing of mechanical properties (hardness and density). According to obtained results, the addition of TiH2 powder into STS improves the mechanical property of the synthesized specimens especially the specimens with addition 20 wt% and 50 wt% of TiH2 demonstrated high hardness values and good density.

Published
2013
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33. Twin-induced phase transition from ?-Ga2O3to ?-Ga2O3in Ga2O3thin films

Author

Choi, Byeongdae, Allabergenov, Bunyod, Lyu, Hong-Kun, and Lee, Seong Eui

Abstract

We deposited a 300-nm-thick Ga2O3thin film on an amorphous SiO2/Si substrate via pulsed laser deposition. X-ray diffraction patterns revealed the formation of ?-Ga2O3phase at a substrate temperature of 700 °C. X-ray photoelectron spectra indicated that the degree of oxidation increased after annealing at 700 °C. Further annealings at higher temperatures led to a transition of the ?-Ga2O3phase to the ?-Ga2O3phase; this transition was caused by the twin structure formed during the crystallinity improvement process. In addition, we discuss the mechanism of the transition from the ? phase to the ? phase in the ?-Ga2O3thin films.

Published
2018
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