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<p>Biomimetic ion channels demonstrate potential for nanoscale molecular separations by leveraging their unique confined recognition capabilities. Metal-organic framework (MOF)-based mixed matrix membranes (MMMs) offer a promising platform that integrates the ångström-scale pores of MOFs with polymer processability. However, slow MOF nucleation kinetics and weak interfacial interactions impede precise channel formation. Here, we present a confined molecular encapsulation (CME) strategy that synchronously regulates MOF nucleation kinetics and interfacial interactions, transforming precursors into flexible gel-network metal-organic gels (MOGs) via supramolecular assembly. Molecular dynamics simulations and in-situ optical detection show that stronger MOG-polymer interactions and confined diffusion govern enhanced interfacial compatibility and uniform dispersion. Optimized MMMs deliver a F⁻/Cl⁻ separation ratio of 32.0 with ionic current rectification. COMSOL simulations demonstrate that synergistic coupling of aligned MOF arrays and uniform surface charge enables efficient ion differentiation. This CME strategy establishes a versatile nanoscale platform for fabricating high-performance monovalent ion-selective membranes and nanofluidic devices.</p>

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In-situ growth of biomimetic ion-selective membranes via confined molecular encapsulation for superior fluoride/chloride separation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月28日

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  • Qian Chen,
  • Mei-Ling Liu,
  • Sheng Jiang,
  • Yu-Tong Zhang,
  • Yue-Wen Jia,
  • Wei-Xing Li,
  • Shi-Peng Sun,
  • Weihong Xing

摘要

Biomimetic ion channels demonstrate potential for nanoscale molecular separations by leveraging their unique confined recognition capabilities. Metal-organic framework (MOF)-based mixed matrix membranes (MMMs) offer a promising platform that integrates the ångström-scale pores of MOFs with polymer processability. However, slow MOF nucleation kinetics and weak interfacial interactions impede precise channel formation. Here, we present a confined molecular encapsulation (CME) strategy that synchronously regulates MOF nucleation kinetics and interfacial interactions, transforming precursors into flexible gel-network metal-organic gels (MOGs) via supramolecular assembly. Molecular dynamics simulations and in-situ optical detection show that stronger MOG-polymer interactions and confined diffusion govern enhanced interfacial compatibility and uniform dispersion. Optimized MMMs deliver a F⁻/Cl⁻ separation ratio of 32.0 with ionic current rectification. COMSOL simulations demonstrate that synergistic coupling of aligned MOF arrays and uniform surface charge enables efficient ion differentiation. This CME strategy establishes a versatile nanoscale platform for fabricating high-performance monovalent ion-selective membranes and nanofluidic devices.