Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 51, Pages 28430-28439Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b09520
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [25790019]
- MEXT
- FWO Vlaanderen [G.0256.14N]
- Grants-in-Aid for Scientific Research [25790019] Funding Source: KAKEN
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ZIF-8 is a flexible zeolitic imidazole-based metal organic framework whose narrow pore apertures swing open by reorientation of imidazolate linkers and expand when probed with guest molecules. This work reports on the crystal size dependency of both structural transitions induced by N-2 and Ar adsorption and dynamic adsorption behavior of n-butanol using well-engineered ZIF-8 crystals with identical surface area and micropore volume. It is found that the crystal downsizing of ZIP-8 regulates the structural flexibility in equilibrium adsorption and desorption of N-2 and Ar. Adsorption kinetics of n-butanol in ZIF-8 are strongly affected by the crystal size, however, not according to a, classical intracrystalline diffusion, mechanism. Our results suggest that Structural transitions and transport properties are dominated by crystal surface effects. Crystal downsizing increases the importance of such surface barriers.
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