Journal article
Size-Dependent Mechanical Properties of a Metal-Organic Framework: Increase in Flexibility of ZIF-8 by Crystal Downsizing
Nano letters, Vol.19(9), pp.6140-6143
09/11/2019
DOI: 10.1021/acs.nanolett.9b02125
PMID: 31433659
Abstract
Size engineering is an emerging strategy to modulate the mechanical properties of crystalline materials. Herein, micro- and nanodimensional single crystals of the prototypical metal-organic framework (MOF) ZIF-8 are generated using solvothermal and solution methods, respectively. Atomic force microscopy-based nanoindentation technique was used to measure the Young's modulus values of micro- and nanodimensional individual ZIF-8 crystals. We demonstrate that crystal downsizing to nanoscale dimensions results in a 40% reduction in crystal stiffness. The change is attributed to a greater contribution of surface effects to the physical properties of nanocrystalline ZIF-8. The observed change in the mechanical properties may be used to explain reported size-dependent changes in gas adsorption of ZIF-8, thought to be a result of differences in framework flexibility at the nanoscale. Our work provides an important example on how downsizing of crystalline metal-organic materials can give rise to specific and tunable physical properties.
Details
- Title: Subtitle
- Size-Dependent Mechanical Properties of a Metal-Organic Framework: Increase in Flexibility of ZIF-8 by Crystal Downsizing
- Creators
- Al A Tiba - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242-1294 United StatesAlexei V Tivanski - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242-1294 United StatesLeonard R MacGillivray - Department of Chemistry , University of Iowa , Iowa City , Iowa 52242-1294 United States
- Resource Type
- Journal article
- Publication Details
- Nano letters, Vol.19(9), pp.6140-6143
- DOI
- 10.1021/acs.nanolett.9b02125
- PMID
- 31433659
- ISSN
- 1530-6984
- eISSN
- 1530-6992
- Language
- English
- Date published
- 09/11/2019
- Academic Unit
- Pharmaceutical Sciences and Experimental Therapeutics; Chemistry
- Record Identifier
- 9984216605902771
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