期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 220, 期 -, 页码 258-269出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.09.008
关键词
Functional composites; Hybrid composites; Metal-organic framework; High internal phase emulsions (HIPE); Water adsorption
类别
资金
- BMBF [OptiMat 03SF0492C]
- DAAD PPP project [China 2j ab 14]
Monolithic shaping of metal-organic frameworks (MOFs), which are normally received as microcrystalline powder is crucial for possible applications of MOFs. Three members of the MIL-family (MIL-100(Fe), MIL-100(Cr) and MIL-101(Cr)), known as water stable porous coordination polymers, were embedded into a macroporous oil-water (o/w) high internal phase emulsion (HIPE) foam, based on cross-linked poly(N-isopropyl acrylamide) (NIPAM). Pre-polymerization of the HIPE emulsions before adding the MIL-MOF powders was an indispensable step in synthesizing highly porous composites, thus, minimizing pore blocking effects. The larger the pores and the higher the surface area of the MIL the less pronounced were pore blocking effects upon composite formation. These composite materials (MIL@-poly(NIPAM)HIPE, in short MIL@NIPAM) could be loaded with up to 92 wt% of the MIL component (followed and verified by powder X-ray diffractometry, infrared spectroscopy and scanning electron microscopy). MIL@NIPAM composites show higher water vapor uptakes in comparison to the native HIPE material so that MIL@NIPAM composites could be used as monolithic water sorbents for heat transformation applications. For MIL-101(Cr)@NIPAM the water uptake of up to 0.4 g/g occurs with the typical S-shaped isotherm in the range of 03 < P . P-0(-1) <0.5. (C) 2015 Elsevier Inc. All rights reserved.
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