The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Eun Ju Jeon - One of the best experts on this subject based on the ideXlab platform.
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synthesis of one dimensional neodymium iron Boron Oxides
Materials Letters, 2020Co-Authors: Eun Ju Jeon, Yongho ChoaAbstract:Abstract Electrospinning is widely used to produce one-dimensional (1-D) fibers with high-aspect ratio. However, there have been no attempts to fabricate neodymium-iron-Boron-oxide (Nd-Fe-B-O) fibers through this method. Considering the coercivity enhancement owing to their enhanced shape anisotropy attributed to the fibrous structure, herein, we prepared fibrous Nd-Fe-B-O. The precursor fibers were prepared by electrospinning. This was followed by heat treatment, for which three different temperatures were employed (900, 1000, and 1100 °C). Furthermore, the effects of the calcination temperature were examined in terms of the quantities of phases and the fibers' crystal sizes. The mass percentage and crystallite sizes differed depending on the calcination temperature. The higher the calcination temperature, the bigger the crystallite sizes of all phases were. The targeted Nd2Fe14B fiber exhibited a coercivity of 7192 Oe.
Masoud Salavatiniasari - One of the best experts on this subject based on the ideXlab platform.
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sol gel synthesis of novel li based Boron Oxides nanocomposite for photodegradation of azo dye pollutant under uv light irradiation
Composites Part B-engineering, 2019Co-Authors: Mahdi Ranjeh, Farshad Beshkar, Masoud SalavatiniasariAbstract:Abstract In the present study, Li2B4O7/LiBO2/Li3BO3 (LBO) nanocomposites were synthesized by a modified Pechini sol-gel route utilizing the mixture of different polybasic acids and gelling agents. This work demonstrated that by controlling the reaction variables including kind of polybasic acids and gelling agents, pH and mole ratio of polybasic acid to total metals, the LBO nanostructures with various morphologies and particle sizes were prepared. Furthermore, the LBO nanocomposites showed excellent TOC removal (70%) and photocatalytic efficiency (91%) in order to photodegradation of acid violet 7 azo dye as water pollutant under UV light irradiation. Moreover, compared to commercial P25 photocatalyst, the LBO heterostructures exhibited higher photodegradation activity for removal of acid violet 7 dye in 90 min under UV light irradiation, even after four times cycles. The excellent photocatalytic degradation of LBO photocatalyst can be ascribed to the strong photon absorption, high-efficiency charge carrier separation, uniform particle size and appropriate band gap energy of the nanocomposite. Also, radical trapping capability test exhibited that the photoinduced superoxide radicals (•O2−) and holes (h+) were the prevailing active species in the photocatalytic performance.
Yongho Choa - One of the best experts on this subject based on the ideXlab platform.
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synthesis of one dimensional neodymium iron Boron Oxides
Materials Letters, 2020Co-Authors: Eun Ju Jeon, Yongho ChoaAbstract:Abstract Electrospinning is widely used to produce one-dimensional (1-D) fibers with high-aspect ratio. However, there have been no attempts to fabricate neodymium-iron-Boron-oxide (Nd-Fe-B-O) fibers through this method. Considering the coercivity enhancement owing to their enhanced shape anisotropy attributed to the fibrous structure, herein, we prepared fibrous Nd-Fe-B-O. The precursor fibers were prepared by electrospinning. This was followed by heat treatment, for which three different temperatures were employed (900, 1000, and 1100 °C). Furthermore, the effects of the calcination temperature were examined in terms of the quantities of phases and the fibers' crystal sizes. The mass percentage and crystallite sizes differed depending on the calcination temperature. The higher the calcination temperature, the bigger the crystallite sizes of all phases were. The targeted Nd2Fe14B fiber exhibited a coercivity of 7192 Oe.
Fan Zhou - One of the best experts on this subject based on the ideXlab platform.
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Properties of Cf/SiC composites modified by a Boron-containing phase
Ceramics International, 2013Co-Authors: Bin Wu, Liangrun Zhang, Yanmei Kan, Shaoming Dong, Zhen Wang, Fan ZhouAbstract:Cf/SiC composites added with a self-healing Boron-containing phase (Cf/SiC-B) was fabricated by slurry infiltration. The slurry was mixed with a Boron-containing precursor and Boron powders. By vacuum impregnation process, it can be well permeated into the fiber preforms and filled within the fiber intra-bundle zones. After heat treatment, the slurry was converted into B4C and SiC phases. It was found that the addition of the Boron-containing phase led to a significant increase in the SiC matrix crystallinity. Compared with pyrolytic carbon (PyC) interphase, non-catastrophic failure was observed for the Cf/SiC-B composites with SiC interphase. Experimental results show that the oxidation resistance of C f/SiC-B composites was improved, and that Boron Oxides formed during Cf/SiC-B composites' exposure in air at 700 °C. © 2012 Elsevier Ltd and Techna Group S.r.l.
S V Devyatkin - One of the best experts on this subject based on the ideXlab platform.
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Chemical and electrochemical behavior of titanium, silicon, and Boron Oxides in molten carbonates
Russian Journal of Electrochemistry, 2012Co-Authors: S V DevyatkinAbstract:The process of dissolution of titanium, silicon, and Boron Oxides in carbonate melts is studied. Voltammetric studies are used to show that the most electropositive electrochemical process in molten carbonates is discharge of carbon dioxide dissolved in the melt to elementary carbon. Electrochemical synthesis of carbides in carbonate melts is possible at the potentials more positive by their value than the potential of carbonate decomposition. Interaction of titanium and silicon carbides with carbonate solutions is studied.
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electrosynthesis of zirconium boride from cryolite alumina melts containing zirconium and Boron Oxides
Russian Journal of Electrochemistry, 2001Co-Authors: S V DevyatkinAbstract:Electrosynthesis of zirconium boride from cryolite–alumina melts containing zirconium and Boron Oxides is studied. A thermodynamic estimate of the synthesis feasibility and cyclic voltammetry data prove that the synthesis involves one stage. Electrolytic ZrB2coatings on nickel are obtained.
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Electrosynthesis of Zirconium Boride from Cryolite–Alumina Melts Containing Zirconium and Boron Oxides
Russian Journal of Electrochemistry, 2001Co-Authors: S V DevyatkinAbstract:Electrosynthesis of zirconium boride from cryolite–alumina melts containing zirconium and Boron Oxides is studied. A thermodynamic estimate of the synthesis feasibility and cyclic voltammetry data prove that the synthesis involves one stage. Electrolytic ZrB2coatings on nickel are obtained.
