胶体
多孔性
离子液体
化学工程
纳米晶
金属有机骨架
吸附
化学
多孔介质
材料科学
纳米技术
有机化学
催化作用
工程类
作者
Bo Liu,Jiandang Liu,Xudong Hou,Tingting Xu,Jing Tong,Junxiang Zhang,Bangjiao Ye,Bo Liu
出处
期刊:Langmuir
[American Chemical Society]
日期:2018-03-06
卷期号:34 (12): 3654-3660
被引量:108
标识
DOI:10.1021/acs.langmuir.7b04212
摘要
We reported an example of metal–organic framework (MOF)-based porous liquid by dispersing ZIF-8 ({Zn(mim)2}, mim = 2-methylimidazole) nanocrystallites in ionic liquid (IL) of [Bpy][NTf2] (N-butyl pyridinium bis(trifluoromethyl sulfonyl)imide). Two essential challenges, stable colloid formation and porosity retention, have been overcome to prepare MOF-based porous liquid. Preventing ZIF-8 nanocrystals from aggregation before dispersing is vital to form a stable ZIF-8 colloid in IL via enhancing the interaction between ZIF-8 and IL. The resultant ZIF-8–[Bpy][NTf2] colloid is able to be stable over months without precipitating. [Bpy][NTf2] with larger ion sizes cannot occupy pores in ZIF-8, leaving the ZIF-8 cage empty for enabling access by guest molecules. The porosity of this porous liquid system was verified by positron (e+) annihilation lifetime spectroscopy and I2 adsorption in ZIF-8 in the colloid. MOF-based porous liquids could provide a new material platform for liquid-bed-based gas separations.
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