聚乙二醇和二乙二醇对溶剂热法合成Fe3O4纳米粒子的尺寸及形貌调控

doi:10.3969/j.issn.2097-2806.2023.08.004

摘要/Abstract

摘要：

采用溶剂热法，通过改变反应体系中聚乙二醇（PEG）用量、PEG分子量、二乙二醇（DEG）体积分数，实现了对Fe₃O₄纳米粒子的尺寸和形貌调控。利用SEM、TEM、XRD和VSM对制备的Fe₃O₄纳米粒子进行了表征。结果表明：核桃状的Fe₃O₄纳米微球由细小的纳米晶粒组成，随着PEG-4000用量的增加，从0.1 g至1.5 g，有利于生成小的Fe₃O₄纳米晶粒。适当增加PEG链的长度，当分子量从200增加到4 000，有利于促进Fe₃O₄纳米晶粒的生长；但进一步增加PEG链的长度，PEG分子量为20 000时，Fe₃O₄纳米晶粒变小。改变溶剂中DEG的体积分数，Fe₃O₄纳米粒子的形貌实现了从表面粗糙的核桃状大微球到表面光滑的小微球，再到规则的长方体晶粒的转变。基于PEG、DEG的吸附、桥连和空间位阻等作用，提出了利用PEG、DEG调控Fe₃O₄纳米尺寸和形貌结构的可能机理。所制备的Fe₃O₄纳米粒子饱和磁化强度约为80 emu/g，表现为超顺磁性。

关键词: Fe₃O₄纳米粒子, 聚乙二醇, 二乙二醇

Abstract:

A simple solvothermal method was used to control the size and morphology of Fe₃O₄ nanoparticles by changing the dosage of polyethylene glycol （PEG）, the molecular weight of PEG, and the volume fraction of diethylene glycol （DEG） in the reaction system. The prepared Fe₃O₄ nanoparticles were characterized by SEM, TEM, XRD and VSM. The results show that the walnut shaped Fe₃O₄ nanospheres are composed of small grains, as the dosage of PEG-4000 increasing from 0.1 g to 1.5 g, the size of the Fe₃O₄ grain tends to decrease. Appropriately increasing the chain length of PEG, with the molecular weight ranging from 200 to 4 000, is beneficial for promoting the growth of Fe₃O₄ nanocrystals. However, further increasing the length of the chain, at a molecular weight of 20 000, results in smaller Fe₃O₄ nanocrystals and microspheres. Changing the volume fraction of DEG can achieve the shapes transformation of Fe₃O₄ nanoparticles, from rough walnut like large microspheres to smooth small microspheres, and then to regular rectangular crystals. Based on the adsorption, grafting, and steric hindrance effects of PEG and DEG, possible mechanisms for the formation of different morphology and size of nanostructures have been proposed, providing a useful reference for the controllable preparation of Fe₃O₄ nanoparticles. The saturation magnetization of the prepared Fe₃O₄ nanoparticles is about 80 emu/g, showing superparamagnetism.

Key words: Fe₃O₄ nanoparticles, polyethylene glycol （PEG）, diethylene glycol （DEG）

中图分类号:

TQ658

王朱良,关舒萍,张敏,杨杰,李永继. 聚乙二醇和二乙二醇对溶剂热法合成Fe₃O₄纳米粒子的尺寸及形貌调控[J]. 日用化学工业（中英文）, 2023, 53(8): 882-890.

Wang Zhuliang,Guan Shuping,Zhang Min,Yang Jie,Li Yongji. The size and morphology control of Fe₃O₄ nanoparticles synthesized by solvothermal method using polyethylene glycol and diethylene glycol[J]. China Surfactant Detergent & Cosmetics, 2023, 53(8): 882-890.

图/表 8

参考文献 38

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聚乙二醇和二乙二醇对溶剂热法合成Fe₃O₄纳米粒子的尺寸及形貌调控

The size and morphology control of Fe₃O₄ nanoparticles synthesized by solvothermal method using polyethylene glycol and diethylene glycol

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