磁铁矿纳米颗粒与磁铁矿/银核/壳纳米结构的比较研究

纳米粒子(英文) Pub Date : 2021-01-01 DOI:10.4236/anp.2021.104008

N. Abdo

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引用次数: 6

摘要

采用Fe 2+和Fe 3+化学共沉淀法合成了磁铁矿纳米颗粒(MNPs)和磁铁矿/银纳米颗粒(M/Ag NPs)。在葡萄糖作为还原剂存在的情况下，MNPs(核心)被金属银(壳)单独包裹。采用动态光散射(DLS)和扫描电镜(SEM)对纳米颗粒的粒径和形貌进行了表征。用振动样品磁强计(VSM)研究了材料的磁性能。纳米粒子的超顺磁特性通过不存在磁滞回线得到证实。银的覆盖产生了核壳异质结构，削弱了MNPs的磁化强度，导致最终的纳米结构具有惰性。磁铁矿纳米粒子与银金属的表面偶联是磁铁矿纳米粒子在实际应用中克服其局限性的重要手段。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Comparative Study between Magnetite Nanoparticles and Magnetite/Silver as a Core/Shell Nanostructure

Magnetite nanoparticles (MNPs) and magnetite/silver nanoparticles (M/Ag NPs) were synthesized by chemical co-precipitation of Fe 2+ and Fe 3+ . In case of M/Ag NPs, MNPs (core) were separately coated by silver metal (shell) in presence of glucose as a reducing agent. The particle size and morphology of the nanoparticles were characterized by dynamic light scattering (DLS) and scanning electron microscopy (SEM). Magnetic properties were investigated by vibrating sample magnetometry (VSM). The superparamagnetic natures of the nanoparticles were confirmed by the absence of the hysteresis loop. Coverage with silver produced a core-shell heterostructure which weakens magnetization of MNPs, inducing an inert character to the ﬁnal nanostructure. The surface conjugation of MNPs with silver metal has been employed in or-der to improve the compatibility of magnetite nanoparticles to overcome their limitations in practical applications.

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纳米粒子(英文)

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106