Impact Mechanism of Needleless Electrospinning Spinneret Geometry on Electric Field Distribution Regularities

doi:10.7503/cjcu20160849

Abstract

Abstract:

In the needleless electrospinning technology, the distribution and the value of electric field at spinneret are the key factors that influence the electrospinning process and the formation of nanofibers. Different geometries of the spinneret directly affect the distribution of the external electric field. Therefore, it is of practical significance for the design and optimization of needleless electrospinning spinneret through the research on the distribution of electric field from the geometry. In this paper, governing equations had been set up to analyze movement process of steady-state jet from three aspects: mass conservation, charge conservation and momentum conservation. The finite element analysis(FEA) software COMSOL Multiphysics 5.0 is used to model three needleless electrospinning spinnerets and analyze the distribution of external electric field. It is found that during the evolution from the typical cylindrical spinneret to the stepped shaft one with the added auxiliary electrodes, the distribution of electric field is influenced by the angle of the auxiliary electrodes added on both sides, plus of the number and diameters of rotary parts. The electric field is optimized step by step through a series of designs. The research is very important to the improvement of production efficiency and nanofiber quality of the needleless electrospinning equipment.

Key words: Electrospinning, Spinneret, Electric field intensity

CLC Number:

O631
O441.4

TrendMD:

WANG Wei, QIANG Wei, DAI Hongchao. Impact Mechanism of Needleless Electrospinning Spinneret Geometry on Electric Field Distribution Regularities[J]. Chem. J. Chinese Universities, 2017, 38(6): 982.

Figures/Tables 11

Fig.1 Schematic diagram of fluid mass conservation

Fig.2 Scheme diagram of electrospinning process

Fig.3 Schematic analysis of micro element visco-us resistance

Fig.4 Schematic diagram of needleless electrosp-inning model

Fig.5 Surface arrow diagram of the electric field distribution of the cylinder spinneret

Fig.6 Distribution of the field intensity on the surface of the cylinder head at different heights in the x-axis directionHeight/mm:a. 0; b. 1; c. 2; d. 3; e. 4.

Fig.7 Schematic diagram of polymer solution bath with the auxiliary electrodes

Fig.8 Electric field intensity distribution in the x-axis direction at 1 mm on the upper surface of the cylinder spinneretθ/(°): a. 0; b. 30; c. 45; d. 60; e. 90.

Fig.9 Evolution schematic diagram of the spinneret from typical cylinder to stepped shaft

Fig.10 Electric field intensity distribution in the x-axis direction at 1 mm on the upper surface of the stepped shaftθ/(°): a. 0; b. 30; c. 45; d. 60; e. 90.

Fig.11 Electric field intensity distribution in the x-axis direction at 1 mm on the upper surface of the stepped shaft(θ=30°)Length/cm: a. 2.4; b. 2.8; c. 3.2.

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