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Published on: April 12, 2019
Molecular simulation of hydrogen diffusion in interpenetrated metal-organic frameworks
Bei Liu1, Qingyuan Yang, Chunyu Xue
1Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands.
Physical Chemistry Chemical Physics : PCCP
|May 27, 2008
Summary
Interpenetration in metal-organic frameworks (MOFs) significantly reduces hydrogen diffusion. Free volume in MOFs correlates with hydrogen diffusivity, offering insights into gas transport in these materials.
Area of Science:
- Materials Science
- Chemical Physics
- Computational Chemistry
Background:
- Metal-organic frameworks (MOFs) are porous materials with tunable structures.
- Gas diffusion within MOFs is crucial for applications like gas storage and separation.
- Interpenetration, or catenation, is a structural feature in some MOFs that can alter their properties.
Purpose of the Study:
- To investigate the impact of interpenetration on hydrogen diffusion in isoreticular MOFs (IRMOFs).
- To establish relationships between MOF structure, free volume, and hydrogen diffusivity.
- To evaluate the utility of dynamically corrected transition-state theory (dcTST) in studying gas diffusion in MOFs.
Main Methods:
- Combined molecular dynamics (MD) simulations and dynamically corrected transition-state theory (dcTST) calculations.
- Systematic study of 10 isoreticular MOFs (IRMOFs) with and without interpenetration.
- Analysis of free volume as a descriptor for hydrogen diffusivity.
Main Results:
- Interpenetration (catenation) was found to reduce hydrogen diffusivity by a factor of 2 to 3 at room temperature.
- In interpenetrated MOFs with varied pore sizes, a larger free volume directly correlated with higher hydrogen diffusivity.
- dcTST successfully elucidated the influence of MOF structure on hydrogen diffusion rates.
Conclusions:
- Catenation in MOFs significantly hinders hydrogen diffusion.
- Free volume is a reliable indicator of hydrogen diffusivity in interpenetrated MOFs.
- dcTST is a powerful computational tool for understanding gas diffusion mechanisms in MOFs and guiding material design.
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