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首页> 外文期刊>Journal of materials science >The effect of capping agents on the structural and magnetic properties of cobalt ferrite nanoparticles
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The effect of capping agents on the structural and magnetic properties of cobalt ferrite nanoparticles

机译：封端剂对钴铁氧体纳米粒子结构和磁性的影响

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Microwave-assisted co-precipitation method was adopted to analyze the effect of polyethylene glycol (PEG) and urea concentrations on the properties of cobalt ferrite nanoparticles (NPs). The average crystallite size of single phase cubic spinel cobalt ferrite NPs was controlled within 10–14 nm with the effect of PEG, urea and the combination of them. The transmission electron micrographs revealed that the morphology of cobalt ferrites was not significantly influenced by the different concentration of capping agents but almost uniform morphology with nearly narrow size distribution was obtained. The interaction of PEG and urea molecules on the surface of nanoparticles was mediated through –OH hydroxyl group affected the crystal growth rate. The possible interaction mechanism was proposed with the help of IR vibrational spectra. All the samples exhibited ferromagnetism at room temperature and it was found that the capping agents showed an effect on the magnetic properties. The maximum saturation magnetization of 58 emu/g was achieved when the urea of 60 mg was used and the maximum coercivity of 311 Oe was attained when the mixture of PEG (40 mg) and urea (20 mg) were used. Ultrafine and hydrophilic cobalt ferrite NPs that showed appreciable magnetic properties obtained in the present experimental procedure would be of great interest in various biomedical applications.
机译：采用微波辅助沉淀法分析了聚乙二醇（PEG）和尿素浓度对钴铁氧体纳米颗粒（NPs）性能的影响。在PEG，尿素及其组合的作用下，单相立方尖晶石钴铁氧体NPs的平均微晶尺寸控制在10-14nm之内。透射电子显微照片显示，不同浓度的封端剂对钴铁氧体的形貌没有显着影响，但获得了几乎均匀的形貌，且尺寸分布窄。 PEG和尿素分子在纳米颗粒表面的相互作用是通过–OH羟基影响晶体生长速率的。借助红外振动光谱，提出了可能的相互作用机理。所有样品在室温下均表现出铁磁性，并且发现封端剂对磁性能有影响。当使用60 mg尿素时，最大饱和磁化强度为58 emu / g，当使用PEG（40 mg）和尿素（20 mg）的混合物时，最大矫顽力达到311 Oe。在本实验程序中显示出可观磁性能的超细和亲水性钴铁氧体NP将在各种生物医学应用中引起极大兴趣。

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