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高频磁场下磁性纳米粒子的热特性：厘清尺寸和涂层的影响

Thermal Traits of MNPs under High-Frequency Magnetic Fields: Disentangling the Effect of Size and Coating.

作者信息

Aurélio David, Mikšátko Jiří, Veverka Miroslav, Michlová Magdalena, Kalbáč Martin, Vejpravová Jana

机构信息

Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.

J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.

出版信息

Nanomaterials (Basel). 2021 Mar 19;11(3):797. doi: 10.3390/nano11030797.

DOI:10.3390/nano11030797
PMID:33808938
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8003606/
Abstract

We investigated the heating abilities of magnetic nanoparticles (MNPs) in a high-frequency magnetic field (MF) as a function of surface coating and size. The cobalt ferrite MNPs were obtained by a hydrothermal method in a water-oleic acid-ethanol system, yielding MNPs with mean diameter of about 5 nm, functionalized with the oleic acid. By applying another cycle of hydrothermal synthesis, we obtained MNPs with about one nm larger diameter. In the next step, the oleic acid was exchanged for 11-maleimidoundecanoic acid or 11-(furfurylureido)undecanoic acid. For the heating experiments, all samples were dispersed in the same solvent (dichloroethane) in the same concentration and the heating performance was studied in a broad interval of MF frequencies (346-782 kHz). The obtained results enabled us to disentangle the impact of the hydrodynamic, structural, and magnetic parameters on the overall heating capabilities. We also demonstrated that the specific power absorption does not show a monotonous trend within the series in the investigated interval of temperatures, pointing to temperature-dependent competition of the Brownian and Néel contributions in heat release.

摘要

我们研究了磁性纳米颗粒（MNPs）在高频磁场（MF）中的加热能力与表面涂层和尺寸的关系。通过水热法在水 - 油酸 - 乙醇体系中制备了钴铁氧体MNPs，得到平均直径约为5 nm的MNPs，并用油酸进行了功能化处理。通过再进行一轮水热合成，我们获得了直径大约大1 nm的MNPs。下一步，将油酸换成11 - 马来酰亚胺基十一烷酸或11 - （糠基脲基）十一烷酸。对于加热实验，所有样品以相同浓度分散在相同溶剂（二氯乙烷）中，并在较宽的MF频率区间（346 - 782 kHz）内研究加热性能。所得结果使我们能够厘清流体动力学、结构和磁性参数对整体加热能力的影响。我们还证明，在所研究的温度区间内，比功率吸收在该系列中并未呈现单调趋势，这表明布朗和尼尔热释放贡献存在温度依赖性竞争。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/15941abaf3f6/nanomaterials-11-00797-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/69fd72f30ccf/nanomaterials-11-00797-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/8d3946cb7af5/nanomaterials-11-00797-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/d1878ad476bd/nanomaterials-11-00797-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/15941abaf3f6/nanomaterials-11-00797-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/69fd72f30ccf/nanomaterials-11-00797-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/8d3946cb7af5/nanomaterials-11-00797-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/d1878ad476bd/nanomaterials-11-00797-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/defa/8003606/15941abaf3f6/nanomaterials-11-00797-g004.jpg

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Understanding Magnetization Dynamics of a Magnetic Nanoparticle with a Disordered Shell Using Micromagnetic Simulations.利用微磁模拟理解具有无序壳层的磁性纳米粒子的磁化动力学。
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Materials (Basel). 2019 Sep 30;12(19):3208. doi: 10.3390/ma12193208.
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