Micro/nano 3D Printing Platform And Patterned Precise Deoposition Based On Near-field Electrospinning

Micro-nano 3D printing development up to now,has made a lot of breakthroughs in technology and progress,especially flexible electronic,micro-sensors,micro-flow control chip and other micro-nano devices have great potential for development.Micro-nano 3D printing is the forefront of rapid prototyping.In this paper,a new method of micro-nano-printing based on near-field electrospinning is proposed,and a self-propelled electrostatic spinning platform is built.Near-field electrospinning technology can reduce the spinning voltage by reducing the spinning distance,not only can reduce the energy consumption,but also effectively solve the traditional far-field electrospinning process of high voltage insecurity,deposition forming effect is unstable and so on.But the distance is short,the low voltage will bring the deposition pattern of low precision,forming a bad effect and a series of problems.The main research work and conclusions can be summarized about the existing problems of near-field electrospinning technology:(1)A high-precision equipment is the basis of near-field electrospinning technology research.To meet the needs of the project,an electrostatic spinning equipment is developed,which includeds the design and development of various subsystems,such as three-axis motion system,forming environment system,material conveying system and numerical control system.(2)Theoretical analysis of the role of electric field in the electrospinning process is carried out.Ansoft maxwell software is used to simulate a single nozzle mode of electric field.The electric field distribution can be intuitively and quickly simulated in the ideal situation.The findings are: the electric field potential and electric field intensity are uniformly distributed on the left and right sides of the nozzle;the direction of the electric field faces to the location where the collection board is placed;there exists a maximum potential on the nozzle surface;the maximum electric field intensity of the nozzle is located at the mouth of the nozzle,of which the direction is facing downward and perpenticlarly to collection board.(3)Based on the motion platform,deposition pattern of PVA solution is explored: this thesis studies the relationship between the movement of the platform and the parameters of direct writing,and the deposition rule of the single-layer motion platform,in order toachieve the stack deposition pattern.The thesis also discusses the realization of accurate deposition of multi-layer patterns.Through the above study of this thesis,the understanding of the near-field direct-write electrospinning is preliminarily grasped,and the setting up of the parameters of the electrospinning is obtained.These experimental results can be used for subsequent study of 3D printing of micro-nano devices using the electrospinning process.