Experimental characterization of electrospinning: the electrically forced jet and instabilities
Experimental characterization of electrospinning: the electrically forced jet and instabilities
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DOI：
10.1016/s0032-3861(01)00540-7
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发表时间：
2001-12-01
期刊：
影响因子：
4.6
通讯作者：
Rutledge, GC
中科院分区：
文献类型：
--
作者：
Shin, YM;Hohman, MM;Rutledge, GC
在静电纺丝工艺中，通过将流体射流施加于高电场形成亚微米级直径的聚合物纤维。我们报告了电强迫射流及其不稳定性的实验研究。这些结果是在最近发展的带电流体射流理论的框架内解释的。我们发现这个过程可以用一组小的操作参数来描述，并通过使用电场与流量的操作图来总结。此外，射流与净电荷密度有关，并与流体性质、外加电场和设备配置有关。净电荷密度似乎对流速相对不敏感，至少在高流速下是这样。实验表明，亚微米尺度固体纤维形成的关键过程是对流不稳定性，即快速振荡射流。这种不稳定性对电场和流速的依赖性以及其增长率的指数性质与理论一致。2001爱思唯尔科学有限公司版权所有。
In the electrospinning process, polymer fibers with submicron-scale diameters are formed by subjecting a fluid jet to a high electric field. We report an experimental investigation of the electrically forced jet and its instabilities. The results are interpreted within the framework of a recently developed theory for electrified fluid jets. We find that the process can be described by a small set of operating parameters and summarized through the use of operating diagrams of electric field versus flow rate. In addition, the jet current is related to the net charge density and found to depend on the fluid properties, the applied electric field and the equipment configuration. The net charge density appears to be relatively insensitive to the flow rate, at least for high flow rates. The experiments reveal that a key process in the formation of submicron-scale solid fibers is a convective instability, the rapidly whipping jet. The dependence of this instability on electric field and flow rate, and the exponential nature of its growth rate are in accord with the theory. (C) 2001 Elsevier Science Ltd. All rights reserved.