Curvature-dependent propulsion of elastic flagella.

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2025-06-19 DOI:10.1039/d4sm01548g
Taylor E Greenwood, Luis Felipe Córdoba, Jian Teng, Saebom Lee, Genevieve Dare, Ebru Demir, On Shun Pak, Yong Lin Kong
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引用次数: 0

Abstract

Soft robotic swimmers that can mimic the flagella-powered locomotion of micro-organisms are of significant interest in a broad range of applications. However, realising micro-organisms' dexterity in soft robots remains challenging without an effective mechanism to achieve bidirectional propulsion in low Reynolds numbers. Here, inspired by recent theoretical studies that suggest the possibility of intrinsically curved elastic flagella to achieve bidirectional propulsion, we experimentally investigate the propulsion behaviour of elastic artificial flagella with uniform intrinsic curvature, actuated by transverse oscillations at Re < 0.1. Our results reveal that the flagella's curvature influences the propulsion direction and magnitude, suggesting a transition between positive and negative propulsion when the flagella's central angle in the stress-free state (θ0) is between 60° and 90° at Sp = 1.5 and 1.8. We also investigate the relationship between the propulsion force and flagella oscillation with numerical simulations. These findings suggest the potential of on-demand curvature modulation during active oscillation to achieve bidirectional propulsion, enhancing the dexterity in flagella-driven artificial swimmers for a broad range of applications in microscale systems.

弹性鞭毛的曲率依赖推进。
软体机器人游泳者可以模仿鞭毛驱动的微生物运动,在广泛的应用中具有重要的兴趣。然而,在软体机器人中实现微生物的灵巧性仍然具有挑战性,因为没有有效的机制来实现低雷诺数的双向推进。最近的理论研究表明,固有弯曲弹性鞭毛可能实现双向推进,受此启发,我们通过实验研究了在Re < 0.1的横向振荡下,具有均匀固有曲率的弹性人工鞭毛的推进行为。结果表明,鞭毛的曲率影响推进方向和大小,在Sp = 1.5和1.8时,鞭毛的无应力状态中心角(θ0)在60°和90°之间时,鞭毛的正推力和负推力之间发生过渡。通过数值模拟研究了鞭毛摆动与推进力之间的关系。这些发现表明,在主动振荡期间,按需曲率调制的潜力可以实现双向推进,提高鞭毛驱动的人工游泳者的灵活性,在微尺度系统中有广泛的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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