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Modular Type III Porous Liquids Based on Porous Organic Cage Microparticles
Author(s) -
Kai Aiting,
Egleston Benjamin D.,
Tarzia Andrew,
Clowes Rob,
Briggs Michael E.,
Jelfs Kim E.,
Cooper Andrew I.,
Greenaway Rebecca L.
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202106116
Subject(s) - materials science , ionic liquid , porosity , microporous material , chemical engineering , dispersion (optics) , porous medium , thermal stability , organic chemistry , composite material , chemistry , catalysis , physics , optics , engineering
The dispersion of particulate porous solids in size‐excluded liquids has emerged as a method to create Type III porous liquids, mostly using insoluble microporous materials such as metal–organic frameworks and zeolites. Here, the first examples of Type III porous liquids based on porous organic cages (POCs) are presented. By exploiting the solution processability of the POCs, racemic and quasiracemic cage microparticles are formed by chiral recognition. Dispersion of these porous microparticles in a range of size‐excluded liquids, including oils and ionic liquids, forms stable POC‐based Type III porous liquids. The flexible pairing between the solid POC particles and a carrier liquid allows the formation of a range of compositions, pore sizes, and other physicochemical properties to suit different applications and operating conditions. For example, it is shown that porous liquids with relatively low viscosities or high thermal stability can be produced. A 12.5 wt% Type III porous liquid comprising racemic POC microparticles and an ionic liquid, [BPy][NTf 2 ], shows a CO 2 working capacity (104.30 µmol g L −1 ) that is significantly higher than the neat ionic liquid (37.27 µmol g L −1 ) between 25 and 100 °C. This liquid is colloidally stable and can be recycled at least ten times without loss of CO 2 capacity.