Adsorption and Diffusion Phenomena in Crystal Size Engineered ZIF-8 MOF
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- 作者：Shunsuke Tanaka ; Kosuke Fujita ; Yoshikazu Miyake ; Manabu Miyamoto ; Yasuhisa Hasegawa ; Takashi Makino ; Stijn Van der Perre ; Julien Cousin Saint Remi ; Tom Van Assche ; Gino V. Baron ; Joeri F. M. Denayer
- 刊名：Journal of Physical Chemistry C
- 出版年：2015
- 出版时间：December 24, 2015
- 年：2015
- 卷：119
- 期：51
- 页码：28430-28439
- 全文大小：541K
- ISSN：1932-7455
文摘
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 N2 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 ZIF-8 regulates the structural flexibility in equilibrium adsorption and desorption of N2 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.