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饱和磁化强度作为钡铁氧体纳米板在表面功能化过程中分解的指标。

Saturation magnetisation as an indicator of the disintegration of barium hexaferrite nanoplatelets during the surface functionalisation.

机构信息

Jožef Stefan Institute, 1000, Ljubljana, Slovenia.

University of Nova Gorica, 5000, Nova Gorica, Slovenia.

出版信息

Sci Rep. 2023 Jan 19;13(1):1092. doi: 10.1038/s41598-023-28431-4.

DOI:10.1038/s41598-023-28431-4
PMID:36658162
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9852462/
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.

摘要

钡铁氧体纳米板（BHF NPLs）是具有垂直于其基面的易磁化轴的永久纳米磁铁。通过将这种特殊性质与优化的表面化学相结合，开发了新型功能材料，例如铁磁铁磁流体和多孔纳米磁铁。我们比较了具有不同化学性质的膦酸，疏水性和亲水性的 1-4 膦酸基团与 BHF NPLs 的相互作用。功能化 BHF NPLs 后饱和磁化强度的降低与非磁性涂层的质量分数相关，而在 80°C 下用四膦酸涂覆的 NPLs 的饱和磁化强度明显低于预期。我们表明，这种饱和磁化强度的大幅降低源于 BHF NPLs 的解体，这可以通过原子分辨率扫描透射电子显微镜观察到，并通过基于最先进第一性原理计算的计算研究得到证实。Fe K 边 XANES（X 射线吸收近边结构）和 EXAFS（扩展 X 射线吸收精细结构）与傅里叶变换红外（FTIR）光谱相结合，证实了部分分解的 NPLs 上形成了 Fe-膦酸盐络合物。将我们的结果与其他功能化磁性纳米颗粒进行比较，证实了当形成不溶性分解产物时，可以利用饱和磁化强度来识别磁性纳米颗粒的解体。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/3cdf43338097/41598_2023_28431_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/aeba944d40b1/41598_2023_28431_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/b470b1dd41b9/41598_2023_28431_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/cc5f5e1eca47/41598_2023_28431_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/60477c02138d/41598_2023_28431_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/cac0a8afa554/41598_2023_28431_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/d891b7899e9e/41598_2023_28431_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/e54b9a9b0b6d/41598_2023_28431_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/3cdf43338097/41598_2023_28431_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/aeba944d40b1/41598_2023_28431_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/b470b1dd41b9/41598_2023_28431_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/cc5f5e1eca47/41598_2023_28431_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/60477c02138d/41598_2023_28431_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/cac0a8afa554/41598_2023_28431_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/d891b7899e9e/41598_2023_28431_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/e54b9a9b0b6d/41598_2023_28431_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/19a8/9852462/3cdf43338097/41598_2023_28431_Fig8_HTML.jpg

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