聚乙二醇和二乙二醇对溶剂热法合成Fe_(3)O_(4)纳米粒子的尺寸及形貌调控  

The size and morphology control of Fe_(3)O_(4)nanoparticles synthesized by solvothermal method using polyethylene glycol and diethylene glycol

作　　者：王朱良 关舒萍 张敏 杨杰 李永继 Zhuliang Wang;Shuping Guan;Min Zhang;Jie Yang;Yongji Li(Upgrading office of Modern College of Humanities and Sciences of Shanxi Normal University,Linfen,Shanxi 041000,China;Center for Shanxi Advanced Permanent Magnetic Materials and Technology,Shanxi Normal University,Taiyuan,Shanxi 030031,China)

机构地区：[1]山西师范大学现代文理学院转设筹备处,山西临汾041000 [2]山西师范大学山西先进永磁材料与技术协同创新中心,山西太原030031

出　　处：《日用化学工业（中英文）》2023年第8期882-890,共9页China Surfactant Detergent & Cosmetics

基　　金：山西先进永磁材料与技术省部共建协同创新中心重点课题资助(省部磁协-2022-1);山西省“1331”工程资助(晋教科-2021-4)。

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Fe_(3)O_(4)纳米粒子的尺寸和形貌调控。利用SEM、TEM、XRD和VSM对制备的Fe_(3)O_(4)纳米粒子进行了表征。结果表明:核桃状的Fe_(3)O_(4)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Fe_(3)O_(4)纳米晶粒。适当增加PEG链的长度,当分子量从200增加到4000,有利于促进Fe_(3)O_(4)纳米晶粒的生长;但进一步增加PEG链的长度,PEG分子量为20000时,Fe_(3)O_(4)纳米晶粒变小。改变溶剂中DEG的体积分数,Fe_(3)O_(4)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Fe_(3)O_(4)纳米尺寸和形貌结构的可能机理。所制备的Fe_(3)O_(4)纳米粒子饱和磁化强度约为80 emu/g,表现为超顺磁性。A simple solvothermal method was used to control the size and morphology of Fe_(3)O_(4)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 Fe_(3)O_(4)nanoparticles were characterized by SEM,TEM,XRD and VSM.The results show that the walnut shaped Fe_(3)O_(4)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 Fe_(3)O_(4)grain tends to decrease.Appropriately increasing the chain length of PEG,with the molecular weight ranging from 200 to 4000,is beneficial for promoting the growth of Fe_(3)O_(4)nanocrystals.However,further increasing the length of the chain,at a molecular weight of 20000,results in smaller Fe_(3)O_(4)nanocrystals and microspheres.Changing the volume fraction of DEG can achieve the shapes transformation of Fe_(3)O_(4)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 Fe_(3)O_(4)nanoparticles.The saturation magnetization of the prepared Fe_(3)O_(4)nanoparticles is about 80 emu/g,showing superparamagnetism.

关 键 词：Fe_(3)O_(4)纳米粒子 聚乙二醇 二乙二醇 溶剂热法 

分 类 号：TQ658[化学工程—精细化工] TB383.1[一般工业技术—材料科学与工程]