Abstract

This study was carried out to evaluate the influence of high voltage polarity on a newly designed multi-pin upward electrospinning spinneret to produce poly (vinyl alcohol) nanofibers. Two different high voltage polarity configurations were applied to the spinneret and collector, namely collector charging configuration (configuration-1) and spinneret charging configuration (configuration-2). The outcomes demonstrated that the collector charging configuration is better in case of upward multi-pin electrospinning setup, to their conservative framework in terms of stable Taylor cone formation, smaller fiber diameter and less bead formation. Electrical field profile in the electrospinning zone was investigated using finite element modelling for both the configurations. No difference in electric field intensity norm (|E|) was observed near the tip of the pins for both the polarities (configurations). Although having the same magnitude, the dominant electrical field component, Ez for configuration -1 is found to be of opposite sign to that of configuration -2. The electrostatic simulations also suggested that all the pins were not at the same potential and that there was a minor difference in pin potentials. Also, optimizations of pin length to reduce the potential differences between the pins were theoretically estimated through COMSOL3D simulation software.

中文翻译：

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多针向上静电纺丝系统中高压极性对聚乙烯醇纤维形态的影响

摘要

进行了这项研究，以评估高压极性对新设计的多针向上静电纺丝喷丝板生产聚乙烯醇纳米纤维的影响。将两种不同的高电压极性配置应用于喷丝板和集电极，即集电极充电配置（配置1）和喷丝板充电配置（配置2）。结果表明，在向上的多针电纺装置中，集电体的充电配置更好，相对于其稳定的泰勒锥形成，较小的纤维直径和较少的磁珠形成而言，其保守性更好。使用这两种配置的有限元建模研究了静电纺丝区域中的电场分布。对于两种极性（构造），在销的尖端附近均未观察到电场强度范数（| E |）的差异。尽管具有相同的幅度，但发现配置-1的主要电场分量Ez与配置-2的符号相反。静电仿真还表明，所有引脚的电位都不相同，并且引脚电位之间的差异很小。同样，通过COMSOL3D仿真软件从理论上估算了为减小引脚之间的电位差而优化的引脚长度。静电仿真还表明，所有引脚的电位都不相同，并且引脚电位之间的差异很小。同样，通过COMSOL3D仿真软件从理论上估算了为减小引脚之间的电位差而优化的引脚长度。静电仿真还表明，所有引脚的电位都不相同，并且引脚电位之间的差异很小。同样，通过COMSOL3D仿真软件从理论上估算了为减小引脚之间的电位差而优化的引脚长度。