The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Yugandhar Bitla - One of the best experts on this subject based on the ideXlab platform.
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van der Waals heteroepitaxy on Muscovite
Materials Chemistry and Physics, 2019Co-Authors: Yugandhar BitlaAbstract:Abstract As current electronics makes a transition from bulky and rigid templates to lightweight and flexible ones, the emerging field of soft technology is set to revolutionize our daily life. Currently, polymer based templates dominate this field due to their excellent mechanical characteristics and low cost, but limited thermal budget and stabilities are the major technological bottlenecks resulting in poor performance and short duration of lifetime. Recently, the technology based on van der Waals heteroepitaxy on Muscovite is considered as a promising solution to overcome these barriers at once. In this paper, the characteristics of Muscovite and the mechanism of van der Waals heteroepitaxy will be introduced, after that, a variety of materials on Muscovite via van der Waals heteroepitaxy and the efforts on practical applications are reported. With the outlook of material science and help of advanced measurements, the evidence of heteroepitaxy of Muscovite and overlayers has been deeply analyzed. Moreover, various measurements of properties was carried under bending conditions to demonstrate the mechanical stability and reliability. Through this review, we pave the path to develop more material systems on Muscovite to make MICAtronics completely.
Yimin Zhang - One of the best experts on this subject based on the ideXlab platform.
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Vanadium Transitions during Roasting-Leaching Process of Vanadium Extraction from Stone Coal
MDPI AG, 2018Co-Authors: Yunliang Zhao, Yimin Zhang, Licai Chen, Shaoxian Song, Shenxu BaoAbstract:The vanadium occurrence in stone coal, water leaching, and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis, and the vanadium transitions during roasting-leaching of stone coal were revealed. In the roasting process, vanadium-bearing Muscovite is converted to K-Na-feldspar, accompanying the liberation of vanadium. Most liberated vanadium reacts with sodium salt to generate water-soluble sodium vanadate, some reacts with calcite in stone coal to form water-insoluble calcium vanadate, and other liberated vanadium exists as free vanadium oxide. However, for coarse Muscovite grains, the reaction of Muscovite converted to K-Na-feldspar only occurs at the outer margin of Muscovite grains, and the vanadium in the interior of Muscovite grains is not liberated. During water leaching, the sodium vanadate is leached out. The calcium vanadate and free vanadium oxide are dissolved out in the process of acid leaching, and the vanadium, presenting in Muscovite grains surrounded by K-Na-feldspar, still remains in the acid leaching residue. Two suggestions, including optimization of grinding-classification process and adopting microwave roasting, were proposed for improving vanadium recovery according to the vanadium transition rules
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effects of hydration and hardening of calcium sulfate on Muscovite dissolution during pressure acid leaching of black shale
Journal of Cleaner Production, 2017Co-Authors: Nannan Xue, Yimin Zhang, Tao Liu, Jing Huang, Qiushi ZhengAbstract:Abstract In the conventional process of oxygen pressure acid leaching of black shale, vanadium extraction depends on acid attack to Muscovite, resulting in high acid consumption and a long leaching time. The two problems significantly reduce equipment life, increase production costs, and decrease production efficiency. To solve these problems, hydration and hardening of calcium sulfate were introduced to promote Muscovite cracking, increasing the exchange reaction rate of hydrogen ion to aluminum ion. This paper investigated the effect of hydration and hardening of calcium sulfate on calcium sulfate growth and Muscovite dissolution, exploring interactions between calcium sulfate and Muscovite. Results indicate that in stress-damaged Muscovite structure, propagation of ductile cracks in Muscovite particles increases their specific surface area and weakens Muscovite structural strength. These effects allow Muscovite to dissolve much more easily during the pressure acid leaching process. The hydration and hardening of calcium sulfate crystals can thus facilitate Muscovite dissolution.
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in situ investigation on mineral phase transition during roasting of vanadium bearing stone coal
Advanced Powder Technology, 2017Co-Authors: Yunliang Zhao, Yimin Zhang, Shaoxian Song, Wei Wang, Shenxu BaoAbstract:Abstract In this work, high temperature in situ X-ray diffraction and in situ analysis of energy dispersive spectrometer were used to find the essence of the roasting of vanadium-bearing stone coal. In the process of roasting, vanadium-bearing Muscovite with quartz was converted to feldspar group minerals (albite, orthoclase and anorthite), during which Al(V) O bonds in Muscovite were broken. Meanwhile, vanadium was liberated from Muscovite, which was the precondition that vanadium can be recovered. These findings were useful for proposing some measures, such as adding quartz, to recover the vanadium from stone coal more efficiently in practice.
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optimal location of vanadium in Muscovite and its geometrical and electronic properties by dft calculation
Minerals, 2017Co-Authors: Qiushi Zheng, Yimin Zhang, Nannan Xue, Tao Liu, Jing Huang, Qihua ShiAbstract:Vanadium-bearing Muscovite is the most valuable component of stone coal, which is a unique source of vanadium manufacture in China. Numbers of experimental studies have been carried out to destroy the carrier Muscovite’s structure for efficient extraction of vanadium. Hence, the vanadium location is necessary for exploring the essence of vanadium extraction. Although most infer that vanadium may substitute for trivalent aluminium (Al) as the isomorphism in Muscovite for the similar atomic radius, there is not enough experimental evidence and theoretical supports to accurately locate the vanadium site in Muscovite. In this study, the Muscovite model and optimal location of vanadium were calculated by density functional theory (DFT). We find that the vanadium prefers to substitute for the hexa-coordinated aluminum of Muscovite for less deformation and lower substitution energy. Furthermore, the local geometry and relative electronic properties were calculated in detail. The basal theoretical research of Muscovite contained with vanadium are reported for the first time. It will make a further influence on the technology development of vanadium extraction from stone coal.
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mechanism of vanadium extraction from stone coal via hydrating and hardening of anhydrous calcium sulfate
Hydrometallurgy, 2016Co-Authors: Nannan Xue, Yimin Zhang, Tao Liu, Jing Huang, Hong Liu, Fang ChenAbstract:Abstract In order to increase the Muscovite/solution active regions in black shale during pressure acid leaching process, a novel reinforcing method is proposed: the hydrating and hardening of anhydrous calcium sulfate (CSA). By adopting this method, the vanadium extraction reached 95.45% after 5 h at a temperature of 150 °C with a sulfuric acid concentration of 20 vol% and potassium sulfate addition of 7 %wt. The addition of potassium sulfate accelerated the hydration of CSA to converts into calcium sulfate dihydrate (CSD). Under hydrothermal conditions, the CSD dissolved and crystallized to transform back into CSA. The transformation of CSD → CSA hardened CSA crystals and caused local stress and generated expension and cracking to Muscovite particles. This produced more Muscovite/solution active regions to make aluminum and vanadium ions exposed to the attack of hydrogen ions, prompting vanadium release from Muscovite lattice.
Nannan Xue - One of the best experts on this subject based on the ideXlab platform.
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effects of hydration and hardening of calcium sulfate on Muscovite dissolution during pressure acid leaching of black shale
Journal of Cleaner Production, 2017Co-Authors: Nannan Xue, Yimin Zhang, Tao Liu, Jing Huang, Qiushi ZhengAbstract:Abstract In the conventional process of oxygen pressure acid leaching of black shale, vanadium extraction depends on acid attack to Muscovite, resulting in high acid consumption and a long leaching time. The two problems significantly reduce equipment life, increase production costs, and decrease production efficiency. To solve these problems, hydration and hardening of calcium sulfate were introduced to promote Muscovite cracking, increasing the exchange reaction rate of hydrogen ion to aluminum ion. This paper investigated the effect of hydration and hardening of calcium sulfate on calcium sulfate growth and Muscovite dissolution, exploring interactions between calcium sulfate and Muscovite. Results indicate that in stress-damaged Muscovite structure, propagation of ductile cracks in Muscovite particles increases their specific surface area and weakens Muscovite structural strength. These effects allow Muscovite to dissolve much more easily during the pressure acid leaching process. The hydration and hardening of calcium sulfate crystals can thus facilitate Muscovite dissolution.
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optimal location of vanadium in Muscovite and its geometrical and electronic properties by dft calculation
Minerals, 2017Co-Authors: Qiushi Zheng, Yimin Zhang, Nannan Xue, Tao Liu, Jing Huang, Qihua ShiAbstract:Vanadium-bearing Muscovite is the most valuable component of stone coal, which is a unique source of vanadium manufacture in China. Numbers of experimental studies have been carried out to destroy the carrier Muscovite’s structure for efficient extraction of vanadium. Hence, the vanadium location is necessary for exploring the essence of vanadium extraction. Although most infer that vanadium may substitute for trivalent aluminium (Al) as the isomorphism in Muscovite for the similar atomic radius, there is not enough experimental evidence and theoretical supports to accurately locate the vanadium site in Muscovite. In this study, the Muscovite model and optimal location of vanadium were calculated by density functional theory (DFT). We find that the vanadium prefers to substitute for the hexa-coordinated aluminum of Muscovite for less deformation and lower substitution energy. Furthermore, the local geometry and relative electronic properties were calculated in detail. The basal theoretical research of Muscovite contained with vanadium are reported for the first time. It will make a further influence on the technology development of vanadium extraction from stone coal.
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mechanism of vanadium extraction from stone coal via hydrating and hardening of anhydrous calcium sulfate
Hydrometallurgy, 2016Co-Authors: Nannan Xue, Yimin Zhang, Tao Liu, Jing Huang, Hong Liu, Fang ChenAbstract:Abstract In order to increase the Muscovite/solution active regions in black shale during pressure acid leaching process, a novel reinforcing method is proposed: the hydrating and hardening of anhydrous calcium sulfate (CSA). By adopting this method, the vanadium extraction reached 95.45% after 5 h at a temperature of 150 °C with a sulfuric acid concentration of 20 vol% and potassium sulfate addition of 7 %wt. The addition of potassium sulfate accelerated the hydration of CSA to converts into calcium sulfate dihydrate (CSD). Under hydrothermal conditions, the CSD dissolved and crystallized to transform back into CSA. The transformation of CSD → CSA hardened CSA crystals and caused local stress and generated expension and cracking to Muscovite particles. This produced more Muscovite/solution active regions to make aluminum and vanadium ions exposed to the attack of hydrogen ions, prompting vanadium release from Muscovite lattice.
Shenxu Bao - One of the best experts on this subject based on the ideXlab platform.
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Vanadium Transitions during Roasting-Leaching Process of Vanadium Extraction from Stone Coal
MDPI AG, 2018Co-Authors: Yunliang Zhao, Yimin Zhang, Licai Chen, Shaoxian Song, Shenxu BaoAbstract:The vanadium occurrence in stone coal, water leaching, and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis, and the vanadium transitions during roasting-leaching of stone coal were revealed. In the roasting process, vanadium-bearing Muscovite is converted to K-Na-feldspar, accompanying the liberation of vanadium. Most liberated vanadium reacts with sodium salt to generate water-soluble sodium vanadate, some reacts with calcite in stone coal to form water-insoluble calcium vanadate, and other liberated vanadium exists as free vanadium oxide. However, for coarse Muscovite grains, the reaction of Muscovite converted to K-Na-feldspar only occurs at the outer margin of Muscovite grains, and the vanadium in the interior of Muscovite grains is not liberated. During water leaching, the sodium vanadate is leached out. The calcium vanadate and free vanadium oxide are dissolved out in the process of acid leaching, and the vanadium, presenting in Muscovite grains surrounded by K-Na-feldspar, still remains in the acid leaching residue. Two suggestions, including optimization of grinding-classification process and adopting microwave roasting, were proposed for improving vanadium recovery according to the vanadium transition rules
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in situ investigation on mineral phase transition during roasting of vanadium bearing stone coal
Advanced Powder Technology, 2017Co-Authors: Yunliang Zhao, Yimin Zhang, Shaoxian Song, Wei Wang, Shenxu BaoAbstract:Abstract In this work, high temperature in situ X-ray diffraction and in situ analysis of energy dispersive spectrometer were used to find the essence of the roasting of vanadium-bearing stone coal. In the process of roasting, vanadium-bearing Muscovite with quartz was converted to feldspar group minerals (albite, orthoclase and anorthite), during which Al(V) O bonds in Muscovite were broken. Meanwhile, vanadium was liberated from Muscovite, which was the precondition that vanadium can be recovered. These findings were useful for proposing some measures, such as adding quartz, to recover the vanadium from stone coal more efficiently in practice.
Yinghao Chu - One of the best experts on this subject based on the ideXlab platform.
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van der waals heteroepitaxial azo nio azo Muscovite ana Muscovite transparent flexible memristor
Nano Energy, 2019Co-Authors: Jose Ramon Duran Retamal, Pao Wen Shao, Yu Hong Lai, Yulun Chueh, Yinghao ChuAbstract:Abstract Multifunctional electronics featuring optical transparency, portability, mechanical flexibility, light-weight and environment-friendly are of great demands for next-generation smart electronics. Memristor represents one of the important chains in next-generation devices as the information computing and storage component. Here, we design the transparent flexible structure based on van der Waals heteroepitaxial AZO/NiO/AZO/Muscovite (ANA/Muscovite) for a memristor application. The (ANA/Muscovite) memristor satisfies all the hardest requirements of a transparent soft device such as optical transparency over 80% in visible light and high performance with a ON/OFF resistance ratio > 105, stable endurance to 103 cycles and long retention time of 105 s. In addition, the ANA/Muscovite memristor can work at various bending radii down to 5 mm, a mechanical bending after 1000 cycles at a curvature with a radius of 6.5 mm and a high temperature up to 185 °C, which deliver a pathway for future applications in flexible transparent smart electronics.
