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Shape-Directed Microspinners Powered by Ultrasound
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-16 00:00:00 , DOI: 10.1021/acsnano.8b00525 Syeda Sabrina , Mykola Tasinkevych 1 , Suzanne Ahmed , Allan M. Brooks , Monica Olvera de la Cruz , Thomas E. Mallouk , Kyle J. M. Bishop 2
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-16 00:00:00 , DOI: 10.1021/acsnano.8b00525 Syeda Sabrina , Mykola Tasinkevych 1 , Suzanne Ahmed , Allan M. Brooks , Monica Olvera de la Cruz , Thomas E. Mallouk , Kyle J. M. Bishop 2
Affiliation
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The propulsion of micro- and nanoparticles using ultrasound is an attractive strategy for the remote manipulation of colloidal matter using biocompatible energy inputs. However, the physical mechanisms underlying acoustic propulsion are poorly understood, and our ability to transduce acoustic energy into different types of particle motions remains limited. Here, we show that the three-dimensional shape of a colloidal particle can be rationally engineered to direct desired particle motions powered by ultrasound. We investigate the dynamics of gold microplates with twisted star shape (Cnh symmetry) moving within the nodal plane of a uniform acoustic field at megahertz frequencies. By systematically perturbing the parametric shape of these “spinners”, we quantify the relationship between the particle shape and its rotational motion. The experimental observations are reproduced and explained by hydrodynamic simulations that describe the steady streaming flows and particle motions induced by ultrasonic actuation. Our results suggest how particle shape can be used to design colloids capable of increasingly complex motions powered by ultrasound.
中文翻译：
超声驱动的形状定向微旋转器
使用生物质能输入对胶体物质进行远程操纵的一种有吸引力的策略是使用超声波推动微颗粒和纳米颗粒的发展。但是，对声音推进的物理机制了解甚少，我们将声能转换为不同类型的粒子运动的能力仍然有限。在这里，我们表明，可以合理地设计胶体粒子的三维形状，以指导超声驱动的所需粒子运动。我们研究了具有扭曲星状（C nh对称性）以兆赫兹频率在均匀声场的节点平面内移动。通过系统地扰动这些“旋转器”的参数形状，我们可以量化粒子形状与其旋转运动之间的关系。实验观察结果通过流体动力学模拟进行再现和解释，该流体动力学模拟描述了稳定的水流和超声驱动引起的粒子运动。我们的结果表明如何使用颗粒形状来设计能够通过超声驱动越来越复杂的运动的胶体。
更新日期：2018-03-16
中文翻译：
超声驱动的形状定向微旋转器
使用生物质能输入对胶体物质进行远程操纵的一种有吸引力的策略是使用超声波推动微颗粒和纳米颗粒的发展。但是，对声音推进的物理机制了解甚少，我们将声能转换为不同类型的粒子运动的能力仍然有限。在这里，我们表明，可以合理地设计胶体粒子的三维形状，以指导超声驱动的所需粒子运动。我们研究了具有扭曲星状（C nh对称性）以兆赫兹频率在均匀声场的节点平面内移动。通过系统地扰动这些“旋转器”的参数形状，我们可以量化粒子形状与其旋转运动之间的关系。实验观察结果通过流体动力学模拟进行再现和解释，该流体动力学模拟描述了稳定的水流和超声驱动引起的粒子运动。我们的结果表明如何使用颗粒形状来设计能够通过超声驱动越来越复杂的运动的胶体。
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