Propulsion and energetics of a minimal magnetic microswimmer.,Soft Matter

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Propulsion and energetics of a minimal magnetic microswimmer.
Soft Matter ( IF 2.9 ) Pub Date : 2020-06-23 , DOI: 10.1039/d0sm00564a
Carles Calero ₁ , José García-Torres ₁ , Antonio Ortiz-Ambriz ₁ , Francesc Sagués ₂ , Ignacio Pagonabarraga ₃ , Pietro Tierno ₄

Affiliation

In this manuscript we describe the realization of a minimal hybrid microswimmer, composed of a ferromagnetic nanorod and a paramagnetic microsphere. The unbounded pair is propelled in water upon application of a swinging magnetic field that induces a periodic relative movement of the two composing elements, where the nanorod rotates and slides on the surface of the paramagnetic sphere. When taken together, the processes of rotation and sliding describe a finite area in the parameter space, which increases with the frequency of the applied field. We develop a theoretical approach and combine it with numerical simulations, which allow us to understand the dynamics of the propeller and explain the experimental observations. Furthermore, we demonstrate a reversal of the microswimmer velocity by varying the length of the nanorod, as predicted by the model. Finally, we determine theoretically and in experiments the Lighthill's energetic efficiency of this minimal magnetic microswimmer.

中文翻译：

最小的磁性微游泳器的推进力和能量学。

在本手稿中，我们描述了由铁磁纳米棒和顺磁微球组成的最小混合微掠器的实现。当施加摆动磁场时，无界对将在水中推进，该摆动磁场会引起两个组成元素的周期性相对运动，其中纳米棒在顺磁球的表面旋转和滑动。当一起考虑时，旋转和滑动过程描述了参数空间中的有限区域，该区域随所施加磁场的频率而增加。我们开发了一种理论方法，并将其与数值模拟相结合，这使我们能够了解螺旋桨的动力学特性并解释实验观察结果。此外，我们通过改变纳米棒的长度证明了微游泳器速度的逆转，如模型所预测。最后，我们在理论上和实验中确定了这种最小的磁性微扫描器的Lighthill能量效率。

更新日期：2020-07-22

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