| Title: | Saturation magnetisation as an indicator of the disintegration of barium hexaferrite nanoplatelets during the surface functionalisation |
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| Authors: | ID Lisjak, Darja (Author)
ID Arčon, Iztok (Author)
ID Poberžnik, Matic (Author)
ID Herrero‑Saboya, Gabriela (Author)
ID Tufani, Ali (Author)
ID Mavrič, Andraž (Author)
ID Valant, Matjaž (Author)
ID Hribar Boštjančič, Patricija (Author)
ID Mertelj, Alenka (Author)
ID Makovec, Darko (Author)
ID Martin‑Samos, Layla (Author) |
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| Files: |  s41598-023-28431-4.pdf (3,60 MB)
MD5: 5D38E7A34C4A40E2830247B07A1EC374
 https://www.nature.com/articles/s41598-023-28431-4
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Barium hexaferrite nanoplatelets (BHF NPLs) are permanent nanomagnets with the magnetic easy axis aligned perpendicular to their basal plane. By combining this specific property with optimised surface chemistry, novel functional materials were developed, e.g., ferromagnetic ferrofluids and porous nanomagnets. We compared the interaction of chemically different phosphonic acids, hydrophobic and hydrophilic with 1–4 phosphonic groups, with BHF NPLs. A decrease in the saturation magnetisation after functionalising the BHF NPLs was correlated with the mass fraction of the nonmagnetic coating, whereas the saturation magnetisation of the NPLs coated with a tetraphosphonic acid at 80 °C was significantly lower than expected. We showed that such a substantial decrease in the saturation magnetisation originates from the disintegration of BHF NPLs, which was observed with atomic-resolution scanning transmission electron microscopy and confirmed by a computational study based on state-of-the-art first-principles calculations. Fe K-edge XANES (X-ray absorption near-edge structure) and EXAFS (Extended X-ray absorption fine structure) combined with Fourier-transformed infrared (FTIR) spectroscopy confirmed the formation of an Fe–phosphonate complex on the partly decomposed NPLs. Comparing our results with other functionalised magnetic nanoparticles confirmed that saturation magnetisation can be exploited to identify the disintegration of magnetic nanoparticles when insoluble disintegration products are formed. |
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| Keywords: | barium hexaferrite, Fe XANES, EXAFS, magnetic nanoparticles |
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| Publication date: | 01.01.2023 |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1092-1-1092-13 |
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| Numbering: | Vol. 13 |
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| PID: | 20.500.12556/RUNG-8293-74d0f16f-ca90-da97-ca21-042926f63e0e  |
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| COBISS.SI-ID: | 138678531 |
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| UDC: | 537 |
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| ISSN on article: | 2045-2322 |
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| DOI: | 10.1038/s41598-023-28431-4 |
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| NUK URN: | URN:SI:UNG:REP:VWUPT5B0 |
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| Publication date in RUNG: | 06.07.2023 |
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| Views: | 1143 |
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| Downloads: | 4 |
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