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  Real-Time Multiple Beam Interferometry Reveals Complex Deformations of Metal-Organic-Framework Crystals upon Humidity Adsorption/Desorption

Baimpos, T., Shrestha, B. R., Hu, Q., Genchev, G., & Valtiner, M. (2015). Real-Time Multiple Beam Interferometry Reveals Complex Deformations of Metal-Organic-Framework Crystals upon Humidity Adsorption/Desorption. The Journal of Physical Chemistry C, 119(29), 16769-16776. doi:10.1021/acs.jpcc.5b04866.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-46C4-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-46C5-4
Genre: Journal Article

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 Creators:
Baimpos, Theodoros1, Author              
Shrestha, Buddha Ratna1, Author              
Hu, Qingyun1, Author              
Genchev, Georgi2, Author              
Valtiner, Markus1, Author              
Affiliations:
1Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863357              
2Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              

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Free keywords: Adsorption; Crystalline materials; Deformation; Gas adsorption; Interferometry; Ionization of gases; Mechanical properties; Molecules; Organic polymers; Organometallics
 Abstract: Gas adsorption in metal-organic-frameworks (MOFs) can dramatically affect the size of the crystals (expansion and/or shrinkage) or lead to distortion of their porous structure/framework. This can strongly affect mechanical properties of MOFs potentially leading to loss or improvement of the performance of applications such as membranes, filters, or sensors. Here, we utilize white light multiple-beam-interferometry (MBI) in a surface forces apparatus (SFA) to measure in real-time the deformations taking place in HKUST-1 crystals during humidity adsorption/desorption cycles. MBI provides a real-time measurement of crystal deformations during guest molecule uptake with msecs time and angstrom distance resolution. We find unusual and unexpected dynamic and nonmonotonic deformation behavior upon humidity loading in HKUST-1 crystals, which we attributed to the gradual filling of the different adsorption sites in the MOF crystal framework. Also, the effect of the external mechanical pressure applied to hydrated/dehydrated crystals strongly affects the flexibility of HKUST-1 crystals and hence their deformation characteristics during guest molecule loading. Our results may have important implications for better understanding/modeling of the effect of gas adsorption on the mechanical properties of MOFs. MBI may be extended not only to other MOFs but also to any other guest-molecule systems in which adsorbate/adsorbent interactions affect structure-property relationships.

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Language(s): eng - English
 Dates: 2015-07-23
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000358624000040
DOI: 10.1021/acs.jpcc.5b04866
 Degree: -

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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 119 (29) Sequence Number: - Start / End Page: 16769 - 16776 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766