Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (09): 39-45.doi: 10.13475/j.fzxb.20201201707

• Fiber Materials • Previous Articles     Next Articles

Jet formation mechanism and film forming characteristics of multi-curved surface sprayer for electrospinning

QUAN Zhenzhen1,2, WANG Yihan1, ZU Yao1, QIN Xiaohong1()   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Shanghai Key Laboratory of Lightweight Composite, Donghua University, Shanghai 201620, China
  • Received:2020-12-08 Revised:2021-05-31 Online:2021-09-15 Published:2021-09-27
  • Contact: QIN Xiaohong E-mail:xhqin@dhu.edu.cn

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Abstract:

In order to achieve batch preparation of sub-micro fibers, a new type of multi-curved surface sprayer was studied. ANSYS Maxwell 3D software was used to simulate the electric field intensity distribution of multi-curved surface sprayer, the theoretical formula about free surface jet formation of curved surface was explored, polyacrylonitrile (PAN) microfiber membranes with different mass fractions were prepared by multi-curved surface sprayer, and their morphologies and yields were characterized using electron microscope and other instruments. The results show that the electric field intensity on the top of the sprayer is the largest, which is prone to wave instability and produce multiple jets. The sub-micro fibers obtained by the electrospinning device are smooth without beads, the average diameter increases with the increase of PAN concentration, and the yield is 103 times higher than that of the traditional single needle device.

Key words: electrospinning, multi-curved surface sprayer, finite element analysis, jet theory, sub-micro fibers, electricfield force, polyacrylonitrile

CLC Number: 

  • TS103.7

Fig.1

Multi-curved surface sprayer electrospun device. (a)Schematic diagram of device; (b)Cross section model of sprayer; (c)Spinning with multi-curved surface sprayer"

Fig.2

Geometric model of electric field simulation for multi-curved surface sprayer"

Tab.1

Properties of materials used in model"

材料 相对介电常数 体积电导率/(S·m-1)
不锈钢 1.00 1.10×106
铝 1.00 3.80×107
PAN 3.92 1.04×10-2

Fig.3

Simulation electric field nephogram of multi-curved surface sprayer. (a) Electric field vector distribution; (b) Electric field line distribution"

Fig.4

Schematic diagram of free surface instability under external force. (a) One dimensional free surface; (b) Surface liquid layer"

Fig.5

Schematic diagram of free surface fluctuation of surface geometry"

Fig.6

SEM images of sub-micro fibers with different PAN concentrations (×8 000) and diameter distribution histograms"

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