基于分形原理的阵列静电纺丝机理研究

In the current study, the concept of Fractal Array Electrospinning Technology is introduced to needleless electrospinning,based on the Fractal Theory, and the forming mechanism of large-scale electrospun nanofibrous preparation is investigated, combined with finite element analysis and electrospinning experiments, in order to come up with the practical and operable solutions for industrialization of electrospinning technology and nanofibrous materials production. The Array electro-spinneret is to be designed based on Fractal Theory to investigate the Fractal based Array electrospinning mechanism.Based on existing electrospinning theories and the statistic field theory in clsssical physics,the finite element analysis software,Ansys is employed to analyze the intensity and distribution of the electric field during Array electrospinning, and effective measures are adopted to improve the distribution and intensity of the electric field for effective control of motion state of the spinning jets during electrospinning, and uniform sized nanofibrous materials. The success of the current project may creat the new concept for needleless electrospinning at high efficiency and high speed, laying the theoretical and pactical foundation for production of nanofibers via needleless electrospining technology at industrial level.

多针头静电纺丝过程中"End effect"现象的存在、电场强度分布不匀以及针头易堵一直是制约静电纺丝技术工业化的障碍所在。本研究提出了一种阵列式无针头静电纺丝技术的新理念，即通过分形技术构建无针头式静电纺丝单元，再将该纺丝单元进行线性或非线性组合和排列以获取阵列静电纺丝模型，并对阵列静电纺丝机理进行深入探讨；以现有静电纺丝理论和经典物理学的静电场理论为依托，采用ANSYS 等有限元软件进行阵列静电纺场强模拟和分析，获取控制场强及其分布的关键参数，在此基础上提出并论证改善场强的新途径。为了验证阵列静电纺丝机理和改善场强措施的有效性，搭建阵列静电纺丝实验平台，以前期理论分析为基础进行阵列静电纺丝验证性实验研究,探讨在分形几何学基础上建立的阵列静电纺丝模型的合理性。本项目的成功可以开创一种场强分布均匀、高效高产的无针头静电纺丝新理念，为无针头静电纺纳米纤维制备技术产业化奠定理论和实践基础。

多针头静电纺丝过程中“End effect”现象的存在、电场强度分布不匀以及针头易堵一直是制约静电纺丝技术工业化的障碍所在。本研究提出了一种阵列式无针头静电纺丝技术的新理念，即通过分形技术构建基本纺丝单元，再将该基本纺丝单元进行圆形或螺旋形组合和排列以获取阵列静电纺丝模型，构建阵列静电纺丝头；采用ANSYS/COMSOL 等有限元软件进行阵列静电纺场强模拟和分析，确定了并列圆形二级分形结构为最优纺丝结构单元，控制场强及其分布的关键参数除了电压、接收距离以外，还包括阵列静电纺丝头的几何参数、排布方式、组合方式、纺丝单元之间的距离、纺丝单元高度/直径、相邻纺丝单元之间的交错转角都是影响场强分布的重要参数。在此基础上提出并论证了改善场强的新途径，包括不等间距、不等高度/直径、不等电压、交错转角。确定了最优阵列静电纺丝头结构参数，搭建阵列静电纺丝实验平台，对提出的基于分形原理的阵列静电纺丝机理进行验证性实验研究，通过制备结构均匀的电纺膜和高性能锂电隔膜论证了本项目提出的静电纺丝理论的可行性和合理性。本项目的成功可以开创一种场强分布均匀、高效高产的无针头静电纺丝新理念，为无针头静电纺纳米纤维制备技术产业化奠定理论和实践基础。