On the shape-dependent propulsion of nano- and microparticles by traveling ultrasound waves,Nanoscale Advances

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On the shape-dependent propulsion of nano- and microparticles by traveling ultrasound waves
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-07-21 , DOI: 10.1039/d0na00099j
Johannes Voß ₁ , Raphael Wittkowski ₁

Affiliation

We address the propulsion mechanism of ultrasound-propelled nano- and microparticles that are exposed to a traveling ultrasound wave. Based on direct computational fluid dynamics simulations, we study the effect of two important aspects of the particle shape on the propulsion: rounded vs. pointed and filled vs. hollow shapes. We also study the flow field generated around such particles. Our results reveal that pointedness leads to an increase of the propulsion speed, whereas it is not significantly affected by hollowness. Furthermore, we show that the flow field near to ultrasound-propelled particles can look similar to the flow field generated by pusher squirmers.

中文翻译：

关于行进超声波对纳米粒子和微米粒子的形状依赖性推进

我们研究暴露于行进超声波的超声波推进的纳米和微粒的推进机制。基于直接计算流体动力学模拟，我们研究了颗粒形状的两个重要方面对推进力的影响：圆形与尖头形状以及填充形状与空心形状。我们还研究了这些颗粒周围产生的流场。我们的结果表明，尖度会导致推进速度的增加，而中空度对其影响并不显着。此外，我们还表明，超声波推进粒子附近的流场看起来与推蠕动器产生的流场相似。

更新日期：2020-09-16

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