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

Yumiao Lu ¹Weilu Ding ¹Kun Li ²Yanlei Wang ¹Bobo Cao ¹Ruirui He ²Hongyan He³

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作者信息

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;University of Chinese Academy of Sciences,Beijing 100049,China
2. 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
3. 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;University of Chinese Academy of Sciences,Beijing 100049,China;Longzihu New Energy Laboratory,Zhengzhou Institute of Emerging Industrial Technology,Zhengzhou 450000,China
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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

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基金项目

National Key Research and Development Program of China(2021YFB3802600)

National Natural Science Foundation of China(22278396)

National Natural Science Foundation of China(22378392)

National Natural Science Foundation of China(22178344)

Youth Innovation Promotion Association CAS(Y2021022)

Open Research Fund of State Key Laboratory of Mesoscience and Engineering(MESO-23-D17)

出版年

2024

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

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