Research On The Jet Instability Of Magnetio-Electrospinning

Electrospinning technology is a very effective and economical method for producing nano-fibers. So it becomes a hot subject in the world. But the charged jet is instable during the electrospinning process, which leads to the uneven construction of nano-fibers and some other bad sequents. So many scholars have studied the instability and tried to control the instability of the jet.This thesis researches the mechanism of the instability of the charged jet and discovers that the instability cause the waste of energy. For controlling the instability, the megnetio-electrospinning is proposed, where magnetic field is applied during the spinning process.This thesis analyzes the moving behavior of the jets during the megnetio-electros -pinning process. The result indicates that the magnetic field creates a radial Lorenz force on the jet, which makes the jet shrink in the falling process. The relationships between the swing of the jet and the distance with or without magnetic field are obtained. From the relationships, we know that the swing scope with a magnetic field is smaller than that without a magnetic field.The influence of the magnetic field on microscope construction of fiber is considerd. The magnetic field can decrease the diameter of nanofibers and enforce their mechanical performance.Numerical verification of our theoretical results is also made, where Runge-Kutta method is used, and a discrete model is suggested. Numerical comparison with classic electrospinning procedure reveals that our system can control the instability in some degree, so that the electric force can be used without any waste and to improve jet's velocity extensively , as a result, much smaller nanofibers can be obtained.Based on the theoretic analyse, a new electrospinning set-up coupled with magnetic field equipment is established, including a traditional electrospinning...