电场聚焦电纺射流动力学调控与喷印工艺研究OA

Electrohydrodynamic Direct-Writing(EDW)technology can efficiently fabricate micro-nano structures in one step and is widely applied in fields such as micro/nano sensing and flexible electronics.However,charged jet of EDW is susceptible to charge interference,which limits the stability,uniformity and positioning accuracy of the printed micro-nano structures.This is a major challenge of EDW in the mi-cro-precision system integration manufacturing process.In this study,an auxiliary needle tip was intro-duced for electric field focusing.The anti-interference ability of the charged jet was enhanced.The deposi-tion and printing behavior under the influence of the focused electric field was investigated.Experimental results indicated that electric-field-focused EDW was beneficial to uniform deposition of fibers.Under the condition of a collector velocity of 20 mm/s,non-spiral micro-nano structures could be obtained.The aver-age diameter of the micro-nano structures printed by electric-field-focused EDW was reduced from 4.84μm to 2.85 μm,and the diameter standard deviation was reduced from 2.03 μm to 1.17 μm.With the help of the precise motion platform,cross-grid patterns were printed successfully.The error between the average size of the grid and the preset size is only 0.4％.A complex emblem pattern and a phoenix flower pattern were fabricated.The deposition morphology was complete,and the fibers were smooth and contin-uous.Focused electric field could significantly enhance the controllability of printing of charged jet,which was of great significance for the popularization and application of EDW technology.