The pursuit of sustainable, carbon-free separation technology hinges on the efficient separation of gas mixtures with high separation factors and flow rates, i.e. high permselectivity. However, achieving this objective is arduous due to the meticulous engineering at the angstrom scale and intricate chemical manipulation required to design the pores within membranes. To address this challenge, a proof-of-concept for an anisotropic porous membrane has been devised. Employing a meticulous step-by-step methodology, two distinct porous metal-organic frameworks (MOFs) are integrated to form a monolithic anisotropic membrane. By harnessing pore anisotropy (3.4 to 6 Å) aligned with the gas permeation direction and a unique interface characterized by cross-linked pores derived from the two distinct MOFs, this membrane transcends the performance limitations inherent in the individual MOF membranes. This approach not only sheds light on the unprecedented heterolayer membrane design strategy but also elucidates the intricate CO2/N2 permselectivity relationship inherent in the interface structure.

中文翻译：

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各向异性孔隙率和界面协同增强异质层金属有机骨架膜的气体选择性渗透

对可持续、无碳分离技术的追求取决于以高分离因子和流速（即高渗透选择性）对气体混合物进行有效分离。然而，由于设计膜内的孔需要埃级的精细工程和复杂的化学操作，实现这一目标是艰巨的。为了应对这一挑战，设计了各向异性多孔膜的概念验证。采用细致的分步方法，将两种不同的多孔金属有机框架（MOF）集成在一起，形成整体各向异性膜。通过利用与气体渗透方向一致的孔各向异性（3.4 至 6 Å）以及以源自两种不同 MOF 的交联孔为特征的独特界面，该膜超越了单个 MOF 膜固有的性能限制。这种方法不仅揭示了前所未有的异质层膜设计策略，而且阐明了界面结构中固有的复杂的CO2/N2选择性渗透关系。