Statistical mechanical model of gas adsorption in porous crystals with dynamic moieties
| Autor: | Cory M. Simon, Carlo Carraro, Efrem Braun, Berend Smit |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Bioengineering Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Crystal metal–organic frameworks Adsorption Molecule flexible metal-organic frameworks metal-organic frameworks Multidisciplinary Nanoporous gas storage 021001 nanoscience & nanotechnology 0104 chemical sciences Hysteresis Membrane flexible metal–organic frameworks PNAS Plus Chemical physics Metal-organic framework statistical mechanics 0210 nano-technology Porous medium porous materials |
| Zdroj: | Proceedings of the National Academy of Sciences Proceedings of the National Academy of Sciences of the United States of America, vol 114, iss 3 |
| ISSN: | 1091-6490 |
| Popis: | Some nanoporous, crystalline materials possess dynamic constituents, for example, rotatable moieties. These moieties can undergo a conformation change in response to the adsorption of guest molecules, which qualitatively impacts adsorption behavior. We pose and solve a statistical mechanical model of gas adsorption in a porous crystal whose cages share a common ligand that can adopt two distinct rotational conformations. Guest molecules incentivize the ligands to adopt a different rotational configuration than maintained in the empty host. Our model captures inflections, steps, and hysteresis that can arise in the adsorption isotherm as a signature of the rotating ligands. The insights disclosed by our simple model contribute a more intimate understanding of the response and consequence of rotating ligands integrated into porous materials to harness them for gas storage and separations, chemical sensing, drug delivery, catalysis, and nanoscale devices. Particularly, our model reveals design strategies to exploit these moving constituents and engineer improved adsorbents with intrinsic thermal management for pressure-swing adsorption processes. |
| Databáze: | OpenAIRE |
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