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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Photochargeable Nanopores in Gas Permselective Membrane.

Arun Kumar Manna¹, Susmita Kundu¹, Komal Jindal¹

¹Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad, Telangana, 500019, India.

Angewandte Chemie (International Ed. in English)

|September 23, 2025

Summary

This study introduces a novel photochargeable membrane using metal-organic frameworks (MOFs) to overcome gas separation limitations. The membrane enhances CO2 selectivity by utilizing light-induced pore charges, surpassing traditional trade-offs.

Keywords:

CO2 separation Electron transfer MOF Mixed‐matrix membrane Photochargeable membrane

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Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Gas separation membranes face a critical trade-off between permeability and selectivity, hindering industrial applications.
Advanced porous materials, especially metal-organic frameworks (MOFs), show promise but require innovative design strategies.
Current strategies focus on porosity, pore architecture, surface chemistry, and morphology, often requiring complex synthesis or external stimuli.

Purpose of the Study:

To develop a photochargeable membrane that enhances gas permselectivity without altering the intrinsic porous structure.
To investigate molecule-specific interactions for improved gas separation performance.
To demonstrate a new approach for surpassing the permeability-selectivity trade-off in gas separation.

Main Methods:

Incorporation of a nanoporous metal-organic framework (MOF) with redox-active organic ligands into a mixed matrix membrane.
Utilizing photoexcitation to induce ligand-ligand charge separation, creating stable pore surface charges.
Evaluating the membrane's performance for CO2/N2 and CO2/CH4 separations.

Main Results:

The photochargeable MOF membrane demonstrated enhanced CO2 permselectivity through specific interactions with CO2 molecules.
The membrane surpassed the established Robeson upper bound for CO2/N2 and CO2/CH4 separations.
Photoexcitation successfully generated selective pore surface charges, modulating gas interactions.

Conclusions:

A novel photochargeable membrane design effectively enhances gas permselectivity by leveraging light-induced charge interactions.
This approach offers a new pathway to overcome the permeability-selectivity trade-off in gas separations.
The technology holds potential for applications in mixed and high-purity gas stream preparation.