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Magnetic control of MOF crystal orientation and alignment

Cheng, Fei; Marshall, Ellis S.; Young, Adam J.; Robinson, Peter J.; Bouillard, Jean Sebastien G.; Adawi, Ali M.; Vermeulen, Nicolaas A.; Farha, Omar K.; Reithofer, Michael R.; Chin, Jia Min

Authors

Fei Cheng

Ellis S. Marshall

Adam J. Young

Nicolaas A. Vermeulen

Omar K. Farha

Michael R. Reithofer

Abstract

Most metal-organic frameworks (MOFs) possess anisotropic properties, the full exploitation of which necessitates a general strategy for the controllable orientation of such MOF crystals. Current methods largely rely upon layer-by-layer MOF epitaxy or tuning of MOF crystal growth on appropriate substrates, yielding MOFs with fixed crystal orientations. Here, the dynamic magnetic alignment of different MOF crystals (NH2-MIL-53(Al) and NU-1000) is shown. The MOFs were magnetized by electrostatic adsorption of iron oxide nanoparticles, dispersed in curable polymer resins (Formlabs 1+ clear resin/ Sylgard 184), magnetically oriented, and fixed by resin curing. The importance of crystal orientation on MOF functionality was demonstrated whereby magnetically aligned NU-1000/Sylgard 184 composite was excited with linearly polarized 405 nm light, affording an anisotropic fluorescence response dependent on the polarization angle of the excitation beam relative to NU-1000 crystal orientation.

Journal Article Type Article
Publication Date Nov 7, 2017
Journal Chemistry - A European journal
Print ISSN 0947-6539
Electronic ISSN 1521-3765
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 23
Issue 62
Pages 15578-15582
Institution Citation Cheng, F., Marshall, E. S., Young, A. J., Robinson, P. J., Bouillard, J. S. G., Adawi, A. M., …Chin, J. M. (2017). Magnetic control of MOF crystal orientation and alignment. Chemistry : a European journal, 23(62), 15578-15582. https://doi.org/10.1002/chem.201703812
DOI https://doi.org/10.1002/chem.201703812
Keywords Metal organic frameworks, Magnetic alignment
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/chem.201703812/full
Additional Information This is a description of an article published in Chemistry - A European journal, 2017.

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