Dynamics of acoustically bound particles
Dynamics of acoustically bound particles
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DOI：
10.1103/physrevresearch.5.013051
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发表时间：
2021-11
影响因子：
4.2
通讯作者：
Nicholas St. Clair;D. Davenport;A. Kim;D. Kleckner
中科院分区：
文献类型：
--
作者：
Nicholas St. Clair;D. Davenport;A. Kim;D. Kleckner
众所周知，声场可以在单个颗粒上产生力，但是由于多次散射事件，它们也可以引起颗粒间的力。这种多粒子力-这里称为声学结合-当粒子的直径为波长量级时，与其他声学力相当。原则上，这种力可以作为一种可调的方法，用于指导毫米级颗粒的组装，但在以前的工作中没有被广泛探讨。在这里，我们使用一种新的数值方法来计算强散射体之间的结合相互作用，并发现它们可以产生稳定的粒子团簇与近似波长分离。此外，我们还观察到，根据阻尼的水平，这些结构可以产生驱动的线性，旋转或振动运动。这些效应是声学结合力的非保守性和非成对性质的结果，并且代表了具有潜在应用于超材料合成和药物递送的新型非接触式操纵和传输方法。
It is well known that acoustic fields can produce forces on single particles, however they can also induce inter-particle forces due to multiple scattering events. This multi-particle force -- here referred to as acoustic binding -- is comparable to other acoustic forces when the particles are of order wavelength in diameter. In principle, this force could be used as a tunable method for directing the assembly of particles of mm-scales, but has not been extensively explored in previous work. Here, we use a novel numerical method to compute binding interactions between strongly scattering bodies and find that they can produce stable clusters of particles with approximately wavelength separation. Moreover, we also observe that -- depending on the level of damping -- these structures can produce driven linear, rotational, or vibrational motion. These effects are a result of the non-conservative and non-pairwise nature of the acoustic binding force, and represent novel contactless manipulation and transport methods with potential application to metamaterial synthesis and drug delivery.