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Proc Natl Acad Sci U S A. 2018 Jun 12;115(24):6159-6164. doi: 10.1073/pnas.1801053115. Epub 2018 May 25.

Dynamic regimes of electrified liquid filaments.

Author information

1
Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, Department of Biomedical Engineering, School of Medicine, Shenzhen University, Shenzhen 518000, China; ttkong@szu.edu.cn hastone@Princeton.edu ashum@hku.hk.
2
Department of Mechanical Engineering, University of Hong Kong, Hong Kong 999077.
3
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544; ttkong@szu.edu.cn hastone@Princeton.edu ashum@hku.hk.
4
Zhejiang Institute of Research and Innovation, University of Hong Kong, Hangzhou 311300, China.
5
Department of Mechanical Engineering, University of Hong Kong, Hong Kong 999077; ttkong@szu.edu.cn hastone@Princeton.edu ashum@hku.hk.
6
Shenzhen Institute of Research and Innovation, University of Hong Kong, Shenzhen 518000, China.

Abstract

We investigate the dynamics of an electrified liquid filament in a nozzle-to-substrate configuration with a close separation. The interplay between compressive viscous and electrostatic stresses dictates previously undocumented transitions between dynamic regimes of "jetting," "coiling," and "whipping." In particular, the onsets of both coiling and whipping instabilities are significantly influenced by the minimum radius along the liquid filament. Using a low-interfacial-tension system, we unravel the physics behind the transitions between jetting, coiling, and whipping of an electrified filament for a range of liquid properties and geometric parameters. Our results enrich the overall physical picture of the electrically forced jets, and provide insights for the emerging high-resolution instability-assisted printing of materials such as folded assemblies and scaffolds.

KEYWORDS:

electrified filaments; electrospinning; instability; viscous flow

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