부산대학교 도서관

To obtain a three-dimensional (3D) micro spiral structure, it is necessary to restrain the whipping of the jet and inhibit the reflux of the solution to enhance the stability of the jet and improve the positioning accuracy of fibers. In this paper, an electrospinning system with double tips was designed by combining the nozzle with the inserted tip and the collecting plate with the induced tip. The electric field distribution was simulated, indicating that the inserted tip in the nozzle provided the tip effect to enhance the restraint effect of the local electric field at the nozzle on the jet, and the induced tip electrode located under the collecting plate led to an electric field concentration effect between the nozzle and the deposition point of the jet, which enhanced the restraint effect of the space electric field on the charged jet and guided the jet to deposit accurately. The experimental results showed that the spatial induction of the double needle tips could guide the charged jet/nanofiber to stack on the collecting plate layer by layer. 3D spiral structures with average diameter about 20 μm and height exceed 30 μm have been achieved. [ABSTRACT FROM AUTHOR]