Mass Production Of Nanofiber And Its Filtration Performance With Dish Shaped Nozzle

In recent years,nano technology has been widely used in the field of air and liquid filtration,tissue engineering,scaffold,composite materials,biological materials,sensors,wound dressings,and other fields.Electrospinning is an efficient technique for preparing nano fibers.However,the traditional single-needle electrospinning has low production efficiency,which limits the development of electrospinning technology.In order to improve the yield,the needless electrospinning technology has received extensive attention and forming a variety of needle electrospinning method.However,the preparation of the best technology to meet the quality and stability of the production of nanofibers is still the biggest technical barriers spinning.In this paper,a new electrospinning nozzle was designed with the aim of providing a new idea for the preparation of high quality nanofibers.Electrospinning is the use of electric field force on the polymerization solution for spinning,the electric field strength and electric field intensity distribution of spinning nozzle has significance.In this paper,the ANSYS Maxwell electromagnetic simulation software is used to simulate the electric field around the dish.Firstly,the distribution of electric field strength around the dish and nozzle structure were analyzed and found that the edge of dish is the maximum electric field intensity;the electric field strength is reduced along the edge of the nozzle contour outward;as voltage is certain,with the tilt angle increases,the distribution of electric field strength focus on edge of nozzle and the maximum electric field strength increases.Taking into account the actual situation of spinning,60 degree is best.Then,the influence of spinning process on the electric field intensity around the disc nozzle was discussed.It is found that when the spinning distance is constant,the maximum electric field intensity at the edge of the nozzle increases with the increase of the voltage;when the voltage is constant,the maximum electric field intensity at the edge of the nozzle increases with the spinning distance.Then,the effects of different spinning parameters on the morphology,diameter and yield of PAN nanofibers were studied.This paper used the single factor experiment,analysis the influence of process parameters on the morphology,diameter and yield,the study found that fixed in other spinning conditions,the average diameter of the nanofibers increases with the increase of spinning solution concentration,increased firstly and then decreased with the increase of spinning voltage,spinning distance decreases with the increase of nanofiber;the yield increased with increasing concentration of the spinning solution of the PAN increases with the increase of the voltage,decreases with increasing the spinning distanceFinally,the filtration properties of the prepared PAN nanofibers membrane were discussed,and the single factor experiment was used.The study found that with the increase of bulk density,the average pore diameter of PAN nanofiber membrane was decreased and the filtration efficiency and filtration resistance increased.Using ?? value evaluation,the best experimental conditions for filtration performance is that PAN mass fraction is 10%,the spinning voltage is 65 k V,the spinning distance is 17.5cm and the spinning time is 12.5min.