Temperature-regulated guest admission and release in microporous materials.

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2017
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Abstract
While it has long been known that some highly adsorbing microporous materials suddenly become inaccessible to guest molecules below certain temperatures, previous attempts to explain this phenomenon have failed. Here we show that this anomalous sorption behaviour is a temperature-regulated guest admission process, where the pore-keeping group's thermal fluctuations are influenced by interactions with guest molecules. A physical model is presented to explain the atomic-level chemistry and structure of these thermally regulated micropores, which is crucial to systematic engineering of new functional materials such as tunable molecular sieves, gated membranes and controlled-release nanocontainers. The model was validated experimentally with H, N, Ar and CH on three classes of microporous materials: trapdoor zeolites, supramolecular host calixarenes and metal-organic frameworks. We demonstrate how temperature can be exploited to achieve appreciable hydrogen and methane storage in such materials without sustained pressure. These findings also open new avenues for gas sensing and isotope separation.
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li2017temperature-regulated Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Gang Kevin;Shang, Jin;Gu, Qinfen;Awati, Rohan V;Jensen, Nathan;Grant, Andrew;Zhang, Xueying;Sholl, David S;Liu, Jefferson Z;Webley, Paul A;May, Eric F;
Journal Nature communications
Year 2017
DOI
10.1038/ncomms15777
URL
Keywords Keywords not found

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