电纺直写单根纳米纤维喷射电流的特性

Jet Current Character for Electrospinning Direct-writing Single Nanofiber

为进一步加深对带电溶液喷射规律的理解,提高单根纳米纤维直写技术控制水平,开发了带微弱电流检测模块的电纺直写实验平台,对单根纳米纤维直写过程的喷射电流进行实时检测;并结合正交试验法,分析了静电纺丝溶液聚合物质量分数、喷头至收集板距离和施加电压3个主要可控工艺参数对喷射电流的影响规律.基于近场静电纺丝电纺直写过程,平均喷射电流10~600 nA;喷射电流变化可分为起始喷射、稳定喷射和停止喷射3个阶段;起始喷射阶段喷射电流的峰值是稳定喷射阶段最大喷射电流的2~3倍;喷射电流随施加电压的增加而变大,随静电纺丝溶液聚合物质量分数和喷头至收集板距离的增加而减小;其中施加电压对喷射电流的影响最大,而静电纺丝溶液聚合物质量分数对喷射电流影响最小.

In order to investigate the jet character of charged solution and raise the controlling technology of single electrospun nanofiber,a direct-written experimental system with weak current testing module was build up.The jet current was tested in real time during the direct-writing process of single nanofiber.Mass percent of electrospinning solution,the spinneret-collector distance and applied voltage were the main controllable process parameters for the direct-writing,and the effect of these parameters was studied through the orthogonal test.The jet current rang from 10 nA to 600 nA for the direct-writing based on near-field electrospinning.There are three stages during the direct-writing process,of which was starting jet,stable jet and ending jet.The peak current in the starting stage is 2 to 3 times as large as the maximal current in the stable stage.The jet current increases with the increase of applied voltage,but decreases with the increase of mass percent of electrospinning solution and the spinneret-collector distance.The applied voltage demonstrates the most significant effect on the jet current,but mass percent of electrospinning solution has the least influence.