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Article

New Insights into Amino-Functionalization of Magnetic Nanoplatelets with Silanes and Phosphonates

1
Department for the Synthesis of Materials, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
2
Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia
3
Department for Organic Chemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, 1000 Ljubljana, Slovenia
4
Materials Research Laboratory, University of Nova Gorica, 5000 Nova Gorica, Slovenia
5
Department of Complex Matter, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
*
Authors to whom correspondence should be addressed.
Academic Editors: Dongchen Qi and Alessandra Manzin
Nanomaterials 2022, 12(12), 2123; https://doi.org/10.3390/nano12122123
Received: 31 May 2022 / Revised: 17 June 2022 / Accepted: 17 June 2022 / Published: 20 June 2022
(This article belongs to the Special Issue Magnetic Nanomaterials and Nanostructures)
Magnetic nanoplatelets (NPLs) based on barium hexaferrite (BaFe12O19) are suitable for many applications because of their uniaxial magneto-crystalline anisotropy. Novel materials, such as ferroic liquids, magneto-optic composites, and contrast agents for medical diagnostics, were developed by specific surface functionalization of the barium hexaferrite NPLs. Our aim was to amino-functionalize the NPLs’ surfaces towards new materials and applications. The amino-functionalization of oxide surfaces is challenging and has not yet been reported for barium hexaferrite NPLs. We selected two amine ligands with two different anchoring groups: an amino-silane and an amino-phosphonate. We studied the effect of the anchoring group, backbone structure, and processing conditions on the formation of the respective surface coatings. The core and coated NPLs were examined with transmission electron microscopy, and their room-temperature magnetic properties were measured. The formation of coatings was followed by electrokinetic measurements, infrared and mass spectroscopies, and thermogravimetric analysis. The most efficient amino-functionalization was enabled by (i) amino-silanization of the NPLs precoated with amorphous silica with (3-aminopropyl)triethoxysilane and (ii) slow addition of amino-phosphonate (i.e., sodium alendronate) to the acidified NPL suspension at 80 °C. View Full-Text
Keywords: barium hexaferrite; nanoplatelets; coatings; alendronic acid; amino-silane barium hexaferrite; nanoplatelets; coatings; alendronic acid; amino-silane
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MDPI and ACS Style

Papan Djaniš, J.; Prinčič, G.G.; Mavrič, A.; Mertelj, A.; Iskra, J.; Lisjak, D. New Insights into Amino-Functionalization of Magnetic Nanoplatelets with Silanes and Phosphonates. Nanomaterials 2022, 12, 2123. https://doi.org/10.3390/nano12122123

AMA Style

Papan Djaniš J, Prinčič GG, Mavrič A, Mertelj A, Iskra J, Lisjak D. New Insights into Amino-Functionalization of Magnetic Nanoplatelets with Silanes and Phosphonates. Nanomaterials. 2022; 12(12):2123. https://doi.org/10.3390/nano12122123

Chicago/Turabian Style

Papan Djaniš, Jelena, Griša Grigorij Prinčič, Andraž Mavrič, Alenka Mertelj, Jernej Iskra, and Darja Lisjak. 2022. "New Insights into Amino-Functionalization of Magnetic Nanoplatelets with Silanes and Phosphonates" Nanomaterials 12, no. 12: 2123. https://doi.org/10.3390/nano12122123

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