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Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium

机译:嵌段共聚物介导的5 nm以下超顺磁性镍纳米粒子在水性介质中的稳定化

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This paper presents a facile method for decreasing the size of water dispersible Ni nanoparticles from 30 to 3 nm by the incorporation of a passivating surfactant combination of pluronic triblock copolymer and oleic acid into a wet chemical reduction synthesis. A detailed study revealed that the size of the Ni nanoparticles is not only critically governed by the concentration of the triblock copolymers but also dependent on the hydrophobic nature of the micelle core formed. The synthesized Ni nanoparticles were thoroughly characterized by means of transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy and temperature and field dependent magnetic measurements, along with a comprehensive Fourier transform infrared spectroscopy analysis, in order to predict a possible mechanism of formation.
机译:本文提出了一种简便的方法,通过将普鲁尼克三嵌段共聚物和油酸的钝化表面活性剂组合物加入湿法化学还原合成中,将水分散性Ni纳米颗粒的尺寸从30 nm减小到3 nm。一项详细的研究表明,Ni纳米颗粒的尺寸不仅严格取决于三嵌段共聚物的浓度,而且还取决于所形成的胶束核的疏水性质。借助透射电子显微镜,x射线衍射,x射线光电子能谱和与温度和场有关的磁测量,以及全面的傅里叶变换红外光谱分析,对合成的Ni纳米颗粒进行了全面表征,以预测可能的机理。编队。

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