Study on uniformity of multi-needle electrostatic spinning by auxiliary flow field

Multi-needle electrospinning is a simple and general method for mass preparation of nanofiber membrane, which has great industrial potential. However, the bending instability produced in the electrospinning process makes that the deposition uniformity of the nanofiber is still a big concern, resulting in non-uniform nanofiber membrane, which seriously affects the application of electrospun membrane in environmental filtration, new energy and medical fields. In order to improve the uniformity of nanofiber deposition in multi-needle electrospinning, an auxiliary flow field system (AFF) is proposed, which can effectively improve the uniformity of nanofiber deposition. After image processing, the uniformity of nanofiber deposition is quantified with the index of grey distribution, and the effectiveness of this method is verified. Combined with the multi-physical field analysis, the influence mechanism of cross-wind field on the uniformity of fibre deposition was revealed. By optimizing the experimental parameters, the non-uniformity of nanofiber deposition was reduced by 49.19%. Based on multi-needle electrospinning technology, a reliable idea (AFF) and experimental basis are provided for the uniform preparation of nanofiber membrane. Herein, a multi-needle electrospinning technique based on cross-wind field assisted system is proposed, and the difference of fibre deposition uniformity under different collection modes is studied through a series of mechanical analysis, physical simulation and experiments. It is verified that the addition of lateral wind field can effectively improve the uniformity of fibre deposition, and provide a promising method for the preparation of more uniform nanofiber films by multi-needle spinning. image