A smart and responsive crystalline porous organic cage membrane with switchable pore apertures for graded molecular sieving.
A smart and responsive crystalline porous organic cage membrane with switchable pore apertures for graded molecular sieving.
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一种智能和响应晶体多孔有机笼膜，具有可切换的孔径，用于分级分子筛选。
DOI：
10.1038/s41563-021-01168-z
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发表时间：
2022-04
期刊：
影响因子：
41.2
通讯作者：
Cooper AI
中科院分区：
文献类型：
--
作者：
He A;Jiang Z;Wu Y;Hussain H;Rawle J;Briggs ME;Little MA;Livingston AG;Cooper AI
具有高选择性的膜为分子分离提供了一条有吸引力的途径，在分子分离中，蒸馏和色谱等技术是能源密集型的。然而，精细调整膜的结构和孔隙度仍然具有挑战性，特别是分离大小相似的分子。在这里，我们报告了一种生产复合膜的工艺，该复合膜包括在聚丙烯腈载体上通过界面合成制备的结晶多孔有机笼膜。这些膜具有超快的溶剂渗透性和对分子量超过600 g mol−1的有机染料的高截留性。结晶笼膜是动态的，其孔径可以在甲醇中切换，从而产生更大的孔，从而提高甲醇的渗透率和更高的分子量（1,400 g mol−1）。通过改变水/甲醇的比例，膜可以在具有不同选择性的两相之间切换，这样一个单一的“智能”晶体膜就可以进行分级的分子筛选。我们通过在单阶段，单膜过程中分离三种有机染料来举例说明这一点。多组分混合物的分离是通过蒸馏进行的，因为多膜级联太复杂。图中，多孔有机笼状复合材料在溶剂中发生固态转变；这改变了孔径，使三种染料的分级分离与单一膜。
Membranes with high selectivity offer an attractive route to molecular separations, where technologies such as distillation and chromatography are energy intensive. However, it remains challenging to fine tune the structure and porosity in membranes, particularly to separate molecules of similar size. Here, we report a process for producing composite membranes that comprise crystalline porous organic cage films fabricated by interfacial synthesis on a polyacrylonitrile support. These membranes exhibit ultrafast solvent permeance and high rejection of organic dyes with molecular weights over 600 g mol−1. The crystalline cage film is dynamic, and its pore aperture can be switched in methanol to generate larger pores that provide increased methanol permeance and higher molecular weight cut-offs (1,400 g mol−1). By varying the water/methanol ratio, the film can be switched between two phases that have different selectivities, such that a single, ‘smart’ crystalline membrane can perform graded molecular sieving. We exemplify this by separating three organic dyes in a single-stage, single-membrane process. The separation of multicomponent mixtures is performed by distillation, as multiple-membrane cascades are too complex. Here, a porous organic cage composite undergoes solid-state transformation in solvent; this alters pore size, enabling graded separation of three dyes with a single membrane.
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影响因子：
16.6
作者：
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作者：
Jones, James T. A.;Hasell, Tom;Cooper, Andrew I.
通讯作者：
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影响因子：
2.5
作者：
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通讯作者：
Ashton AW