Chemically routed interpore molecular diffusion in metal-organic framework thin films

Tanmoy Maity, Pratibha Malik, Sumit Bawari, Soumya Ghosh, Jagannath Mondal and Ritesh Haldar ()
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Tanmoy Maity: Tata Institute of Fundamental Research Hyderabad, Gopanpally
Pratibha Malik: Tata Institute of Fundamental Research Hyderabad, Gopanpally
Sumit Bawari: Tata Institute of Fundamental Research Hyderabad, Gopanpally
Soumya Ghosh: Tata Institute of Fundamental Research Hyderabad, Gopanpally
Jagannath Mondal: Tata Institute of Fundamental Research Hyderabad, Gopanpally
Ritesh Haldar: Tata Institute of Fundamental Research Hyderabad, Gopanpally

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Transport diffusivity of molecules in a porous solid is constricted by the rate at which molecules move from one pore to the other, along the concentration gradient, i.e. by following Fickian diffusion. In heterogeneous porous materials, i.e. in the presence of pores of different sizes and chemical environments, diffusion rate and directionality remain tricky to estimate and adjust. In such a porous system, we have realized that molecular diffusion direction can be orthogonal to the concentration gradient. To experimentally determine this complex diffusion rate dependency and get insight of the microscopic diffusion pathway, we have designed a model nanoporous structure, metal-organic framework (MOF). In this model two chemically and geometrically distinct pore windows are spatially oriented by an epitaxial, layer-by-layer growth method. The specific design of the nanoporous channels and quantitative mass uptake rate measurements have indicated that the mass uptake is governed by the interpore diffusion along the direction orthogonal to the concentration gradient. This revelation allows chemically carving the nanopores, and accelerating the interpore diffusion and kinetic diffusion selectivity.

Date: 2023
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DOI: 10.1038/s41467-023-37739-8

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