Direct observation of ordered-disordered structural transition of MoS2-confined ionic liquids

doi:10.1016/j.cjche.2024.05.015

中国化学工程学报 ›› 2024, Vol. 72 ›› Issue (8): 126-132.DOI: 10.1016/j.cjche.2024.05.015

Direct observation of ordered-disordered structural transition of MoS₂-confined ionic liquids

Yumiao Lu^1,2, Weilu Ding^1,2, Kun Li¹, Yanlei Wang^1,2, Bobo Cao^1,2, Ruirui He¹, Hongyan He^1,2,3

1 CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Mesoscience and Engineering, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China

收稿日期:2023-12-31 修回日期:2024-04-11 出版日期:2024-08-28 发布日期:2024-10-17
通讯作者: Hongyan He,E-mail:hyhe@ipe.ac.cn
基金资助:
This work was supported by the National Key Research and Development Program of China (2021YFB3802600), the National Natural Science Foundation of China (22278396, 22378392, 22178344), the Youth Innovation Promotion Association CAS (Y2021022), and the Open Research Fund of State Key Laboratory of Mesoscience and Engineering (MESO-23-D17).

Direct observation of ordered-disordered structural transition of MoS₂-confined ionic liquids

Yumiao Lu^1,2, Weilu Ding^1,2, Kun Li¹, Yanlei Wang^1,2, Bobo Cao^1,2, Ruirui He¹, Hongyan He^1,2,3

1 CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Mesoscience and Engineering, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450000, China

Received:2023-12-31 Revised:2024-04-11 Online:2024-08-28 Published:2024-10-17
Contact: Hongyan He,E-mail:hyhe@ipe.ac.cn
Supported by:
This work was supported by the National Key Research and Development Program of China (2021YFB3802600), the National Natural Science Foundation of China (22278396, 22378392, 22178344), the Youth Innovation Promotion Association CAS (Y2021022), and the Open Research Fund of State Key Laboratory of Mesoscience and Engineering (MESO-23-D17).

摘要/Abstract

摘要： Ionic liquids (ILs) are an emerging class of media of fundamental importance for chemical engineering, especially due to their interaction with solid surfaces. Here, we explore the growth phenomenon of surface-confined ILs and reveal a peculiar structural transition behavior from order to disorder above a threshold thickness. This behavior can be explained by the variation of interfacial forces with increasing distance from the solid surface. Direct structural observation of different ILs highlights the influence of the ionic structure on the growth process. Notably, the length of the alkyl chain in the cation is found to be a determining factor for the ordering trend. Also, the thermal stability of surface-confined ILs is investigated in depth by controlling annealing treatments. It is found that the ordered monolayer ILs exhibit high robustness against high temperatures. Our findings provide new perspectives on the properties of surface-confined ILs and open up potential avenues for manipulating the structures of nanometer-thick IL films for various applications.

关键词: Ionic liquids (ILs), Surface-confined ILs, Structural transition, Thermal stability, Interfacial forces

Abstract: Ionic liquids (ILs) are an emerging class of media of fundamental importance for chemical engineering, especially due to their interaction with solid surfaces. Here, we explore the growth phenomenon of surface-confined ILs and reveal a peculiar structural transition behavior from order to disorder above a threshold thickness. This behavior can be explained by the variation of interfacial forces with increasing distance from the solid surface. Direct structural observation of different ILs highlights the influence of the ionic structure on the growth process. Notably, the length of the alkyl chain in the cation is found to be a determining factor for the ordering trend. Also, the thermal stability of surface-confined ILs is investigated in depth by controlling annealing treatments. It is found that the ordered monolayer ILs exhibit high robustness against high temperatures. Our findings provide new perspectives on the properties of surface-confined ILs and open up potential avenues for manipulating the structures of nanometer-thick IL films for various applications.

Key words: Ionic liquids (ILs), Surface-confined ILs, Structural transition, Thermal stability, Interfacial forces

Yumiao Lu, Weilu Ding, Kun Li, Yanlei Wang, Bobo Cao, Ruirui He, Hongyan He. Direct observation of ordered-disordered structural transition of MoS₂-confined ionic liquids[J]. 中国化学工程学报, 2024, 72(8): 126-132.

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Direct observation of ordered-disordered structural transition of MoS₂-confined ionic liquids

Direct observation of ordered-disordered structural transition of MoS₂-confined ionic liquids

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