Micro-nano Fibers Are Prepared By Bubble Melt And Acoustic Resonance Electrospinning Technology

Electrospinning technology is one of the technologies currently widely used in the preparation of micro-nanofibers.It has the characteristics of green environmental protection,high efficiency and easy control,and large-scale production.In addition,the diameter of prepared micro-nanofibers may range from a few nanometers to several micrometers,and generally have the advantages of large specific surface area,high porosity,and unique physical properties.Recently,researchers in various countries have devoted a lot of time and effort to research and improve electrospinning technology,and explored the development of new applications in tissue engineering,biomedicine,nanodevices,etc.,and promoted the development of electrospinning technology.At present,electrospinning technology is mainly divided into solution electrospinning and melt electrospinning.The preparation of micro-nanofibers by melt electrospinning technology can overcome the shortcomings of low spinning efficiency,solvent toxic and volatile,which are commonly found in solution electrospinning technology.Compared with the research results of solution electrospinning,the research on melt electrospinning technology needs further research.Conventional melt electrospinning technology also has its own inherent defects,such as easy clogging of the needle and electrostatic interference between the metal needles.In order to solve the related problems,this paper proposes a needle-free bubble melt electrospinning technology.First,we redesigned the experimental setup to achieve our melt bubble electrospinning.The new device design avoids electromagnetic interference between the electrospinning high pressure system and the melt heated high temperature system.In addition,we have added a temperature control and detection system to adjust the experimental conditions more conveniently and quickly,so as to achieve precise control of the experimental temperature.We have made adjustments to the intake system and the collection system to set the experimental parameters freely to meet the experimental conditions of different experimental materials.We have added a high-speed camera and can observe small changes in the experimental results at any time during the experiment.We have experimentally tested many high polymer materials,such as thermoplastic polyurethane elastomer(TPU),polylactic acid(PLA),and so on.Through experimental observation,some materials can be normally prepared by bubble-spin electrospinning technology to obtain micro-nano fibers,but not all materials are suitable for melt bubble electrospinning.Then we conducted further experimental tests and analysis on TPU micro-nanofibers and PLA micro-nanofibers.We have also designed a needle-free acoustic resonance electrospinning technology to achieve the preparation of nanofibers.Devices designed using the resonance principle do not require a needle,avoiding needle clogging and increasing the yield of electrospun fibers.Through experiments,we obtained micro-nano fibers of different materials by bubble melt electrospinning.The experimental conditions are convenient and controllable,and the experimental process is relatively smooth.We believe that bubble melt electrospinning technology can have broader application prospects.The needle-free acoustic wave resonance spinning technology is also a new type of electrospinning technology with potential application in the mass production of nanofibers.