Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 24, Pages 6159-6164Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1801053115
Keywords
instability; electrified filaments; electrospinning; viscous flow
Categories
Funding
- National Natural Science Foundation of China [11504238, 21476189/B060201, 91434202]
- Research Grants Council of Hong Kong [719813E, 17304514, 17306315, 17237316, 17211115, 17207914, 717613E]
- Fundamental Research Program of Shenzhen [JCYJ20160308092144035]
- University of Hong Kong [201511159108, 201411159074]
- Zhejiang Provincial Government
- Hangzhou Municipal Government
- Lin'an County Government
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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.
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