期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 22, 期 4, 页码 1820-1825出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp04467a
关键词
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资金
- National Key Research and Development Program of China [2018YFB0604903]
- National Science Fund for Excellent Young Scholars [21922813]
- National Natural Science Foundation of China [21908221, 21890762, 21776278]
- Fund of State Key Laboratory of Multiphase complex systems [MPCS-2019-A-08]
- Fund of Dalian National Laboratory for Clean Energy of the CAS [DNL 180202]
- Transformational Technologies for Clean Energy and Demonstration'' Strategic Priority Research Program of the CAS [XDA 21031000]
Understanding and manipulating nano-confined ionic liquids (ILs) has tremendous implications in nanotechnology and chemical engineering. Here, a peculiar growth phenomenon of a nano-confined [Bmim][NTFI] ionic liquid is revealed by utilizing two-dimensional channels in mica. The intercalated ILs underwent liquid-solid transition and self-assembled into a self-similar two-dimensional crystal in an epitaxial relation with the confining material. The terraced IL crystals, ranging from monolayer to bilayer to several dozen layers, are characterized by unexpectedly large areas extending to mm-scale and enhanced thermal stability with a melting temperature 73 K higher than that of the corresponding bulk IL. The notable asymmetric feature of the layered crystals hints at anisotropic growth under confinement, which produces a well-defined hexagonal geometric shape. Finally, a molecular scale growth mechanism of ordered ILs is qualitatively interpreted by a birth-and-spread model. Our findings have enabled new research on nanoconfined ILs and opened up an avenue to tailoring the structure of ILs for their applications under confinement.
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