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Your search keyword '"Qin, Hongling"' showing total 171 results
Start Over Author "Qin, Hongling" Publication Type Academic Journals
171 results on '"Qin, Hongling"'

12. Predicting the solubility of CO2 and N2 in ionic liquids based on COSMO-RS and machine learning.

Author

Qin, Hongling, Wang, Ke, Ma, Xifei, Li, Fangfang, Liu, Yanrong, and Ji, Xiaoyan

Subjects
*MACHINE learning, *IONIC liquids, *SOLUBILITY, *COUPLINGS (Gearing), *NITROGEN
Abstract

As ionic liquids (ILs) continue to be prepared, there is a growing need to develop theoretical methods for predicting the properties of ILs, such as gas solubility. In this work, different strategies were employed to obtain the solubility of CO2 and N2, where a conductor-like screening model for real solvents (COSMO-RS) was used as the basis. First, experimental data on the solubility of CO2 and N2 in ILs were collected. Then, the solubility of CO2 and N2 in ILs was predicted using COSMO-RS based on the structures of cations, anions, and gases. To further improve the performance of COSMO-RS, two options were used, i.e., the polynomial expression to correct the COSMO-RS results and the combination of COSMO-RS and machine learning algorithms (eXtreme Gradient Boosting, XGBoost) to develop a hybrid model. The results show that the COSMO-RS with correction can significantly improve the prediction of CO2 solubility, and the corresponding average absolute relative deviation (AARD) is decreased from 43.4% to 11.9%. In contrast, such an option cannot improve that of the N2 dataset. Instead, the results obtained from coupling machine learning algorithms with the COSMO-RS model agree well with the experimental results, with an AARD of 0.94% for the solubility of CO2 and an average absolute deviation (AAD) of 0.15% for the solubility of N2. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Tribological Properties and Adaptability of Ionic Liquid Lubricating Carbon Brush/Collector Ring with Current.

Author

QIN Hongling, GAO Mengmeng, JIA Lei, YI Jingwen, ZHAO Xinze, and XU Xiang

Abstract

The carbon brush/collector ring device of the hydro--generator unit often encounter problems such as overheating and sparking due to the contact problem of the friction interface. Ionic liquids have excellent lubricating properties under current--carrying conditions without destroying the electrical continuity between the contact surfaces, it can improve the safety and reliability of the unit' s operation. To further explore the adaptability, reliability and related mechanism of ionic liquids as lubricants for carbon brush/collector ring assemblies, three types of ionic liquids, including imidazoles, quaternary phosphines, and functionalized ionic liquids, were selected in the experiment, and the tribological performance under current-carrying friction conditions were evaluated. The results show that functionalized ionic liquids have the best lubricating performance among the three types of ionic liquids, which can reduce the friction coefficient and contact resistance to the greatest extent, making the interface contact more stable. The length of the alkyl side chain of imidazole ionic liquids strongly affects the lubricity of the current--carrying interface, and imidazole ionic liquids with longer alkyl side chains have better tribological properties. The current-carrying and lubricating properties of ionic liquids under current-carrying friction conditions are related to the properties of the lubricant and the double-layer protective composite film formed on the wear surface, and the functionalized ionic liquids with special functionalities are more easily adsorbed on the surface of carbon brushes to form strong lubricating film. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag–Cu Eutectic Alloys.

Author

Xu, Jiaxing, Gao, Jianjun, Qin, Hongling, Liu, Zhiyang, Zhu, Linpeng, Geng, Haibin, Yao, Ligang, and Zhao, Zhilong

Subjects
EUTECTIC alloys, DIRECTIONAL solidification, NANOWIRES, SOLIDIFICATION
Abstract

Cu nanowires and a nanoporous Ag matrix were fabricated through directional solidification and selective dissolution of Ag–Cu eutectic alloys. Ag-39.9at.%Cu eutectic alloys were directionally solidified at growth rates of 14, 25, and 34 μm/s at a temperature gradient of 10 K/cm. The Cu phase in the Ag matrix gradually changed from lamellar to fibrous with an increase in the growth rate. The Ag matrix phase was selectively dissolved, and Cu nanowires of 300–600 nm in diameter and tens of microns in length were prepared in 0.1 M borate buffer with a pH of 9.18 at a constant potential of 0.7 V (vs. SCE). The nanoporous Ag matrix was fabricated through selective dissolution of Cu fiber phase in 0.1 M acetate buffer with a pH of 6.0 at a constant potential of 0.5 V (vs. SCE). The diameter of Ag pores decreased with increasing growth rate. The diameter and depth of Ag pores increased when corrosion time was extended. The depth of the pores was 30 μm after 12 h. [ABSTRACT FROM AUTHOR]

Published
2022
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