期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 47, 页码 15420-15424出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808433
关键词
composites; films; metal-organic frameworks; self-folding; swelling behaviour
资金
- Spanish MINECO [PN MAT2015-65354-C2-1-R, SEV-2013-0295]
- Catalan AGAUR [2014 SGR 80]
- ERC, under EU-FP7 [ERC-Co 615954]
- MINECO
- Junta de Andalucia [P12-FQM-1656, MAT2013-41836-R]
- CERCA Programme/Generalitat de Catalunya
Herein, we exploit the well-known swelling behaviour of metal-organic frameworks (MOFs) to create a self-folding polymer film. Namely, we show that incorporating crystals of the flexible MOF MIL-88A into a polyvinylidene difluoride (PVDF) matrix affords a polymer composite film that undergoes reversible shape transformations upon exposure to polar solvents and vapours. Since the self-folding properties of this film correlate directly with the swelling properties of the MIL-88A crystals, it selectively bends to certain solvents and its degree of folding can be controlled by controlling the relative humidity. Moreover, it shows a shape-memory effect at relative humidity values from 60% to 90%. As proof of concept, we demonstrate that these composite films can lift cargo and can be used to assemble 3D structures from 2D patterns. Our strategy is a straightforward method for designing autonomous soft materials with folding properties that can be tuned by judicious choice of the constituent flexible MOF.
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