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首页> 外文期刊>RSC Advances >Enhancement of magnetic heating efficiency in size controlled MFe2O4 (M = Mn, Fe, Co and Ni) nanoassemblies
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Enhancement of magnetic heating efficiency in size controlled MFe2O4 (M = Mn, Fe, Co and Ni) nanoassemblies

机译：尺寸受控的MFe2O4（M = Mn，Fe，Co和Ni）纳米组件中磁加热效率的提高

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The MFe2O4 magnetic nanoparticle nanoassemblies (MNNAs) have been synthesized via thermal decomposition of metal chloride in ethylene glycol (EG) in the presence of ethylenediamine (EDA). The size of the nanoassemblies is controlled in the range of 25-60 nm by manipulation of Fe-precursor mole content to ethylene glycol (EG) content and from 60 to 135 nm by using a bi-solvent mixture of ethylene glycol and polyethylene glycol (PEG-400). In this study, we demonstrate optimization of magnetic fluid heat activation by tailoring the size of MFe2O4 (M = Mn, Fe, Co and Ni) MNNAs. The densely packed nanocrystals within the MNNAs induce strong exchange as well as dipolar interactions between the nanocrystals, which increases the total magnetic moment for MNNAs. Additionally the magnetization (MS, magnetization in a field of 20 kOe) of MNNAs decreases in the order Mn > Fe > Co > Ni due to the cationic distribution of ions with varying magnetic moments in these spinel oxides. A sharp increase of heating efficiency for 25-60 nm assembled particles could be attributed to the collective Neel relaxation of nanocrystals within the assemblies and also due to high particle magnetic moment, which increases with the MNNAs size. Furthermore, among all the MFe2O4 nanoassemblies of various sizes, Fe3O4 MNNAs with an average diameter of 80 nm show an excellent SAR value of 646 W g(-1) of Fe3O4 at 247 kHz with an applied AC magnetic field of 310 Oe, which is 4 times higher than that of the single domain assembled nanoparticles. The moderate anisotropy constant and high MS values of Fe3O4 MNNAs make it a most suitable candidate to produce the highest heating power. These magnetic MNNAs are efficient in killing the cancer cells by the application of an AC magnetic field even for a short treatment time of 30 min.
机译：MFe2O4磁性纳米颗粒纳米组件（MNNA）是通过在乙二胺（EDA）存在下在乙二醇（EG）中金属氯化物热分解而合成的。纳米组件的尺寸通过将Fe前驱物的摩尔含量控制为乙二醇（EG）的含量而控制在25-60 nm的范围内，并且使用乙二醇和聚乙二醇的双溶剂混合物将纳米组件的尺寸控制在60-135 nm的范围内（ PEG-400）。在这项研究中，我们展示了通过调整MFe2O4（M = Mn，Fe，Co和Ni）MNNA的尺寸来优化磁流体热活化的方法。 MNNA中密集堆积的纳米晶体诱导了纳米晶体之间的强交换以及偶极相互作用，从而增加了MNNA的总磁矩。另外，由于这些尖晶石氧化物中具有变化的磁矩的离子的阳离子分布，MNNA的磁化强度（MS，在20 kOe的磁场中）以Mn> Fe> Co> Ni的顺序降低。 25-60 nm组装粒子的加热效率急剧增加，可能归因于组件内纳米晶体的集体Neel弛豫，也归因于高粒子磁矩，随MNNA尺寸的增加而增大。此外，在所有各种尺寸的MFe2O4纳米组件中，平均直径为80 nm的Fe3O4 MNNA在247 kHz的频率下施加310 Oe的交流磁场时，Fe3O4的SAR值为646 W g（-1）。比单域组装的纳米颗粒高4倍。 Fe3O4 MNNA的中等各向异性常数和高MS值使其成为产生最高加热功率的最合适的候选者。这些磁性MNNA即使在30分钟的短治疗时间内也可通过施加AC磁场有效杀死癌细胞。

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