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首页> 外文期刊>Nano Hybrids >Surface Engineering of Magnetite Nanoparticles by Plant Protein: Investigation into Magnetic Properties
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Surface Engineering of Magnetite Nanoparticles by Plant Protein: Investigation into Magnetic Properties

机译：利用植物蛋白对磁铁矿纳米颗粒进行表面工程：磁性的研究

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The surface of the magnetite nanoparticles has been engineered by the proteins available in the leaf extract of Datum inoxia. Fourier Transform Infrared (FTIR) study and by thermo gravimetric analysis (TGA) confirms the bonding between metal ions and the amide carbonyl group preset in the plant protein confirming the formation of core-shell structure. The plant protein coated magnetic Fe3O4 nanoparticles under investigation have an average size of about 14 nm (<20nm). The isothermal magnetization curve of the ferrofluid appears in S-like sigmoid shape showing soft nonhysteretic magnetic behaviour at room temperature. The saturation magnetization (M_s), remanent magnetization (M_r), squareness (M_r/M_s) and coercivity value (H_c) increased with decreasing temperature from 300 K to 10 K. The increment of magnetization (45 to 53 emu/gm) might be due to the decrease in thermal energy while the enhancement of coercivity (0-208 O_e) is attributed to the exchange interaction at the interface between the ferromagnetic (Fe3O4) and diamagnetic surface layer of protein on the nanocrystalline magnetite. The magnetization value is much smaller in comparison with the bulk magnetite (92emu/g) due to surface spin disorder also approves core-shell structure of diamagnetic protein layer on the surface. The results show the ease of the synthesis to reinforce the colloidal stability where the super paramagnetic behaviour has been found to be restored. The core-shell moiety could play an important role in biological systems as a means of storing Fe~(+3) for an organism.
机译：磁铁矿纳米颗粒的表面已通过Datum inoxia叶片提取物中的蛋白质进行了工程改造。傅里叶变换红外（FTIR）研究和热重分析（TGA）证实了金属离子与植物蛋白中预设的酰胺羰基之间的键合，从而确认了核-壳结构的形成。研究中的植物蛋白包被的磁性Fe3O4纳米颗粒的平均大小约为14 nm（<20nm）。铁磁流体的等温磁化曲线以S形S形出现，在室温下显示出柔软的非迟滞磁特性。随着温度从300 K降低到10 K，饱和磁化强度（M_s），剩余磁化强度（M_r），矩形度（M_r / M_s）和矫顽力值（H_c）增大。磁化强度的增量（45至53 emu / gm）可能是由于热能的减少，而矫顽力（0-208 O_e）的提高归因于纳米晶磁铁矿上蛋白质的铁磁（Fe3O4）与抗磁表面层之间的界面处的交换相互作用。由于表面自旋无序，与块状磁铁矿（92emu / g）相比，磁化值小得多，这也证明了表面上抗磁性蛋白质层的核-壳结构。结果表明合成容易以增强胶体稳定性，其中已发现超顺磁行为得以恢复。核-壳部分可能在生物系统中起重要作用，作为一种为生物存储Fe〜（+3）的手段。

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