期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 158, 期 -, 页码 292-299出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2012.03.052
关键词
Zeolitic imidazolate framework; Mixed-matrix membranes; Ostwald ripening; Sonication; Membrane formation
类别
资金
- King Abdullah University of Science and Technology [KUS-I1-011-21]
- U.S. DOE [DE-AC02-06CH11357]
The effect of typical membrane processing conditions on the structure, interfacial morphology, and gas separation performance of MOF/polymer nanocomposite membranes is investigated. In particular, the ZIF-8/Matrimid (R) nanocomposite membrane system is examined, and it is shown that ultrasonication a commonly employed particle dispersion method - induces significant changes in the shape, size distribution, and structure of ZIF-8 particles suspended in an organic solvent during membrane processing. Dynamic light scattering and electron microscopy reveal that ZIF-8 nanoparticles undergo substantial Ostwald ripening when subjected to high intensity ultrasonication as often required in the formation of MOF/polymer nanocomposite membranes. Other characterization techniques reveal that the ripened particles exhibit lower pore volumes and lower surface areas compared to the as-made material. ZIF-8/Matrimid (R) composite membranes fabricated using two sonication methods show significant differences in microstructure. Permeation measurements show significant enhancement in permeability of CO2 and increased CO2/CH4 selectivity in membranes fabricated with high-intensity sonication. In contrast, composite membranes prepared with low-intensity sonication are found to be defective. A careful evaluation of MOF membrane processing conditions, as well as knowledge of the properties of the MOF material after these membrane processing steps, are necessary to develop reliable processing-structure-property relations for MOF-containing membranes. (C) 2012 Elsevier Inc. All rights reserved.
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