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Title: Statistical mechanical model of gas adsorption in porous crystals with dynamic moieties

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
ORCiD logo [1];  [1];  [1];  [2]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Valais Ecole Polytechnique Federale de Lausanne (EPFL), Sion (Switzerland)

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. Here, 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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001015
OSTI ID:
1388053
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 3; Related Information: CGS partners with University of California, Berkeley; University of California, Davis; Lawrence Berkeley National Laboratory; University of Minnesota; National Energy Technology Laboratory; Texas A&M University; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (5)

Exploiting rotational motion in molecular crystals journal January 2018
Statistical mechanics of binary mixture adsorption in metal–organic frameworks in the osmotic ensemble
  • Dunne, Lawrence J.; Manos, George
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 376, Issue 2115 https://doi.org/10.1098/rsta.2017.0151
journal February 2018
Predicting the Features of Methane Adsorption in Large Pore Metal-Organic Frameworks for Energy Storage journal October 2018
Structural Basis of CO2 Adsorption in a Flexible Metal-Organic Framework Material journal March 2019
Flexible Force Field Parameterization through Fitting on the Ab Initio-Derived Elastic Tensor journal July 2017