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Open AccessArticle

Hydrophobicity Influence on Swimming Performance of Magnetically Driven Miniature Helical Swimmers

1
School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518172, China
2
Guangdong Provincial Key Laboratory of Robotics and Intelligent System, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
3
CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems, Shenzhen Institutes of Advanced Technology, Shenzhen 518055, China
4
Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China
5
Shanghai Jiaotong University, Shanghai 200233, China
6
Shenzhen Key Laboratory of Minimally Invasive Surgical Robotics and System, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(3), 175; https://doi.org/10.3390/mi10030175
Received: 15 January 2019 / Revised: 22 February 2019 / Accepted: 28 February 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Microswimmer)
Helical microswimmers have been involved in a wide variety of applications, ranging from in vivo tasks such as targeted drug delivery to in vitro tasks such as transporting micro objects. Over the past decades, a number of studies have been established on the swimming performance of helical microswimmers and geometrical factors influencing their swimming performance. However, limited studies have focused on the influence of the hydrophobicity of swimmers’ surface on their swimming performance. In this paper, we first demonstrated through theoretical analysis that the hydrophobicity of swimmer’s surface material of the swimmer does affect its swimming performance: the swimmer with more hydrophobic surface is exerted less friction drag torque, and should therefore exhibit a higher step-out frequency, indicating that the swimmer with more hydrophobic surface should have better swimming performance. Then a series of experiments were conducted to verify the theoretical analysis. As a result, the main contribution of this paper is to demonstrate that one potential approach to improve the helical microswimmers’ swimming performance could be making its surface more hydrophobic. View Full-Text
Keywords: magnetically driven helical swimmer; step-out frequency; low Reynolds number; hydrophilibity influence magnetically driven helical swimmer; step-out frequency; low Reynolds number; hydrophilibity influence
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MDPI and ACS Style

Ye, C.; Liu, J.; Wu, X.; Wang, B.; Zhang, L.; Zheng, Y.; Xu, T. Hydrophobicity Influence on Swimming Performance of Magnetically Driven Miniature Helical Swimmers. Micromachines 2019, 10, 175.

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