Here, we present a new concept of a core-shell type ionic liquid/metal organic framework (IL/MOF) composite. A hydrophilic IL, 1-(2-hydroxyethyl)-3-methylimidazolium dicyanamide, [HEMIM][DCA], was deposited on a hydrophobic zeolitic imidazolate framework, ZIF-8. The composite exhibited approximately 5.7 times higher CO2 uptake and 45 times higher CO2/CH4 selectivity at 1 mbar and 25 °C compared to the parent MOF. Characterization showed that IL molecules deposited on the external surface of the MOF, forming a core (MOF)-shell (IL) type material, in which IL acts as a smart gate for the guest molecules.

中文翻译：

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核壳型离子液体/金属有机骨架复合材料：具有极高的 CO2/CH4 选择性

在这里，我们提出了核壳型离子液体/金属有机骨架（IL/MOF）复合材料的新概念。亲水性 IL、1-(2-羟乙基)-3-甲基咪唑鎓二氰胺、[HEMIM][DCA] 沉积在疏水沸石咪唑酯骨架 ZIF-8 上。与母体 MOF 相比，该复合材料在 1 mbar 和 25 °C 下表现出约 5.7 倍的 CO2 吸收和 45 倍的 CO2/CH4 选择性。表征表明，IL 分子沉积在 MOF 的外表面上，形成核 (MOF)-壳 (IL) 型材料，其中 IL 充当客体分子的智能门。