Application Of Electrospinning Technology In Magnetic Hyperthermia And Haze Filtration

Electrospinning may be one of the easiest ways to construct nanofiber structures.Since its rise in the late 1990s and early 2000s,research laboratories around the world have been exploring the use of nanofibers in a variety of applications.Electrospinning technology has attracted extensive attention as a method of low cost,simple process and continuous large-scale production of nanofibers.It has also been widely used in air filtration,photolysis and medical dressings.First,we developed a method for accurately depositing a composite fiber membrane in situ by a portable electrospinning device.A tapered aluminum auxiliary electrode was added to the position of the spinning head to adjust the deposition direction and range of the magnetic composite fiber..The purpose of this study was to investigate the effect of auxiliary electrodes on magnetic composite fiber membranes,which may change in morphology and structure.Compared with traditional methods,this technology can deposit nanofibers on complex irregular tumor tissues very quickly and accurately,forming a continuous,compact and flexible nanofiber membrane,which serves as a heat source for locally heating the tumor region and does not The surrounding healthy tissue overheats and inhibits tumor growth or enhances the anti-tumor effect of chemotherapy,radiotherapy and immunotherapy.In vitro studies have shown that electrospinningγ-Fe₂O₃/PU magnetic fiber membrane has excellent magnetic hyperthermia effect.In addition,the thermal stability of theγ-Fe₂O₃/PU composite fiber membrane was also confirmed by repeated magnetic field excitation.Then,we developed a new positive and negative two-electrode electrospinning method to make PM filter gauze.The method not only can uniformly prepare electrospun nanofibers on the yarn web,but also can improve the preparation speed.In addition,PM filters are made using four high molecular polymer materials（polyacrylonitrile,polystyrene,polyvinyl alcohol and polyurethane）,uniformly distributed and deposited on the web,and between the central region of the grid and the frame,the fiber distribution There is no difference in density.Finally,indium-doped Ga_1-xIn_xFeO₃（GIFO）with x=0-0.15 was successfully prepared by solid phase reaction.The structure,magnetic and electrical properties of the samples were investigated.All samples were well displayed by the polar Pc21n space group and no phase transition was observed.Due to the enhancement of lattice distortion,the saturation magnetization exhibited a maximum value in the lightly doped sample of Ga_0.95In_0.05FeO₃,showing a correspondence relationship with the change in the Fe³⁺distribution difference between the two forms of sites.Thermoelectric measurements show an increase in polarization after doping.The results show that In doping can optimize the magnetic and ferroelectric properties of GaFeO₃.