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Magnetic Control of MOF Crystal Orientation and Alignment
Author(s) -
Cheng Fei,
Marshall Ellis S.,
Young Adam J.,
Robinson Peter J.,
Bouillard JeanSebastien G.,
Adawi Ali M.,
Vermeulen Nicolaas A.,
Farha Omar K.,
Reithofer Michael R.,
Chin Jia Min
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703812
Subject(s) - orientation (vector space) , materials science , geometry , mathematics
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 (NH 2 ‐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.