Direct observation of ordered-disordered structural transition of MoS_(2)-confined ionic liquids  

作　　者：Yumiao Lu Weilu Ding Kun Li Yanlei Wang Bobo Cao Ruirui He Hongyan He 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2024年第8期126-132,共7页中国化学工程学报（英文版）

基　　金：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);the Open Research Fund of State Key Laboratory of Mesoscience and Engineering(MESO-23-D17)。

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 

分 类 号：O645.1[理学—物理化学]