Magnetic Control of MOF Crystal Orientation and Alignment

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

doi:10.1002/chem.201703812

Magnetic Control of MOF Crystal Orientation and Alignment

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

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

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.

Original language	English (US)
Pages (from-to)	15578-15582
Number of pages	5
Journal	Chemistry - A European Journal
Volume	23
Issue number	62
DOIs	https://doi.org/10.1002/chem.201703812
State	Published - Nov 7 2017

Keywords

anisotropy
fluorescence
magnetic alignment
metal-organic framework
polymer composites

ASJC Scopus subject areas

Catalysis
Organic Chemistry

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10.1002/chem.201703812

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title = "Magnetic Control of MOF Crystal Orientation and Alignment",

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.",

keywords = "anisotropy, fluorescence, magnetic alignment, metal-organic framework, polymer composites",

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note = "Funding Information: J.C. and M.R.R. thank the University of Hull for providing the financial support to carry out this work. E.S.M., P.J.R., and A.J.Y. thank the University of Hull for the provision of their University Scholarships. We would also like to thank Dr. Timothy J. Prior for helpful discussions on PXRD patterns. Publisher Copyright: {\textcopyright} 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

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doi = "10.1002/chem.201703812",

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AU - Cheng, Fei

AU - Marshall, Ellis S.

AU - Young, Adam J.

AU - Robinson, Peter J.

AU - Bouillard, Jean Sebastien G.

AU - Adawi, Ali M.

AU - Vermeulen, Nicolaas A.

AU - Farha, Omar K.

AU - Reithofer, Michael R.

AU - Chin, Jia Min

N1 - Funding Information: J.C. and M.R.R. thank the University of Hull for providing the financial support to carry out this work. E.S.M., P.J.R., and A.J.Y. thank the University of Hull for the provision of their University Scholarships. We would also like to thank Dr. Timothy J. Prior for helpful discussions on PXRD patterns. Publisher Copyright: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2017/11/7

Y1 - 2017/11/7

N2 - 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.

AB - 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.

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KW - polymer composites

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Magnetic Control of MOF Crystal Orientation and Alignment

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Keywords

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