Abstract
Multi-needle electrospinning technology is a method for mass production of nanofibers, which can improve the production efficiency of nanofibers by increasing the number and density of needles for multi-needle electrospinning. However, when the arrangement density of the needle is high, the electric field of the needle tip is not uniform, causing instability such as jet dripping and broken jet. In this paper, the electric field uniformity optimization problem of multi-needle electrospinning technology is used to simulate the needle tip electric field by using COMSOL finite element analysis software. The influence of the needle size and the dielectric material on the electric field of the tip was studied. Finally, the method of using dielectric material on the tip of the middle part of the needle is beneficial to the electric field uniformity. The uniformity of the needle tip electric field in the case of high-density arrangement of the needle is realized, and the nozzle is provided for mass production of nanofibers by multi-needle electrospinning.
Highlights
Based on the previous research,19 this paper will continue to study the optimized electric field uniformity of the tips with trapezoidal array, the variation of the needle diameter of the 16-needle trapezoidal nozzle on the electric field of the tip, and the improved electric field strength and uniformity with different dielectric materials, which has an important meaning to the large-scale preparation of high-quality nanofiber films
Based on the previous research,19 the electric field uniformity of multi-needle electrospinning tip arranged in the trapezoidal array is further studied
The COMSOL is used to simulate the tip electric field, and the electric field values of the tip are extracted for comparison
Summary
The traditional electrospinning process has the advantages of stable and controllable spinning process, multi spinning materials, simple technology and diverse fiber structure, which has been widely used by researchers. In order to realize the industrial scale production of high-quality nanofiber film, multi-needle electrospinning technology and needleless electrospinning technology have become popular technologies for the efficient fabrication of nanofiber film. The common needleless electrospinning technologies include roll type needleless electrospinning, cone metal nozzle, spray-typed needleless electrospinning, spiral coil needleless electrospinning nozzle, wire electrode nozzle, rotary electrospinning technology, bubble electrospinning, magnetic field-induced electrospinning, cone and spiral coil nozzle, bowl shaped needleless electrospinning, pyramid-like stepladder needleless electrospinning nozzle, etc. With needleless spinning technology, the efficient preparation of the nanofiber film of some materials have become. In order to realize the industrial scale production of high-quality nanofiber film, multi-needle electrospinning technology and needleless electrospinning technology have become popular technologies for the efficient fabrication of nanofiber film.. It is found that for linearly arranged needles, the edge effect of the electric field of the tips are still obvious. For the large-scale and high efficient fabrication of nanofibers, the edge effect of the needle tips will be amplified, which will affect the whole production stability. Based on the previous research, this paper will continue to study the optimized electric field uniformity of the tips with trapezoidal array, the variation of the needle diameter of the 16-needle trapezoidal nozzle on the electric field of the tip, and the improved electric field strength and uniformity with different dielectric materials, which has an important meaning to the large-scale preparation of high-quality nanofiber films
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