采用不同分子量聚乙二醇可控制备磁性Fe_(3)O_(4)空心纳米微球及其性能研究

Study on Magnetic Fe_(3)O_(4) Hollow Nanospheres and Its Performance Controlled by Different Molecular Weight Polyethylene Glycol

通过水热法合成了一系列磁性空心Fe_(3)O_(4)纳米微球,并利用扫描电镜(SEM)、X-射线衍射(XRD)、热重(TG)、磁滞回线等测试方法研究了合成过程中不同分子量聚乙二醇(PEG400、1000、4000)及其添加量对Fe_(3)O_(4)微球粒径大小、磁性能、沉降性能的影响.研究发现在聚乙二醇分子量相同时,添加0.6 g聚乙二醇比添加0.3 g聚乙二醇得到的磁性Fe_(3)O_(4)空心纳米微球在水和有机溶剂DMAc中分散性好,所得到的微球粒径更大,磁性能相近.相比于聚乙二醇添加量,聚乙二醇分子量对磁性Fe_(3)O_(4)空心纳米微球磁性能影响更大.可通过改变聚乙二醇分子量大小,来调节磁性Fe_(3)O_(4)空心纳米微球粒径,磁性Fe_(3)O_(4)空心纳米微球粒径随聚乙二醇分子量的增加有下降趋势.通过调节聚乙二醇所得到的磁性Fe_(3)O_(4)空心纳米微球在水和有机溶剂二甲基乙酰胺(DMAc)中均具有良好的分散性,特别是在水溶剂中8 d才完全沉降,添加0.6 gPEG4000所得的磁性空心Fe_(3)O_(4)纳米微球在DMAc中分散性非常突出,有望在废水处理和电磁波吸收等领域得到很好应用.

A series of magnetic hollow Fe_(3)O_(4) nanospheres were synthesized by hydrothermal method,and the different methods in the synthesis process were studied by scanning electron microscopy(SEM),X-ray diffraction(XRD),thermogravimetry(TG),and hysteresis loop.The influence of molecular weight polyethylene glycol(PEG400、1000、4000)and its addition amount on the particle size,magnetic properties and sedimentation properties of Fe_(3)O_(4) microspheres.The study found that when the molecular weight of polyethylene glycol is the same,the magnetic Fe_(3)O_(4) hollow nanospheres obtained by adding 0.6 g polyethylene glycol have better dispersibility in water and organic solvent DMAc than 0.3 g polyethylene glycol.The resulting microspheres for particle size is larger and the magnetic properties are similar.Compared with the amount of polyethylene glycol added,the molecular weight of polyethylene glycol has a greater impact on the magnetic properties of the magnetic Fe_(3)O_(4) hollow nanospheres.The particle size of the magnetic Fe_(3)O_(4) hollow nanospheres can be adjusted by changing the molecular weight of polyethylene glycol.The particle size of the magnetic Fe_(3)O_(4) hollow nanospheres has a decreasing trend with the increase of the molecular weight of polyethylene glycol.The magnetic Fe_(3)O_(4) hollow nanospheres obtained by adjusting polyethylene glycol have good dispersibility in water and organic solvent dimethylacetamide(DMAc),especially in water solvent for 8 days to completely settle,add 0.6 g The magnetic hollow Fe_(3)O_(4) nanospheres obtained by PEG4000 have outstanding dispersibility in DMAc,and are expected to be well applied in the fields of wastewater treatment and electromagnetic wave absorption.