Edges control clustering in levitated granular matter

Edges control clustering in levitated granular matter
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边缘控制悬浮颗粒物质的聚集

DOI:
10.1007/s10035-019-0926-2
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发表时间:
2019
期刊:
影响因子:
2.4
通讯作者:
Jaeger, Heinrich M.
Jaeger, Heinrich M.
中科院分区:
工程技术3区
文献类型:
--
作者:
Lim, Melody X.;Murphy, Kieran A.;Jaeger, Heinrich M.

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小团簇的性质很大程度上取决于其组成粒子之间的相互作用。然而,设计和调节宏观颗粒之间的相互作用仍然具有挑战性,例如在颗粒材料中。在这里,我们使用声悬浮来捕获宏观颗粒并在它们之间产生力。我们的主要结果表明,悬浮在声场中的颗粒更喜欢使接触沿着尖锐的边缘。边缘的曲率半径直接控制这些力的大小。这些高度定向的相互作用,结合局部接触力,产生了一系列不同的集群形状。我们的研究结果为宏观粒子之间的特定力的设计,指导它们的组装和驱动它们的运动开辟了新的可能性。
The properties of small clusters depend dramatically on the interactions between their constituent particles. However, it remains challenging to design and tune the interactions between macroscopic particles, such as in a granular material. Here, we use acoustic levitation to trap macroscopic grains and induce forces between them. Our main results show that particles levitated in an acoustic field prefer to make contact along sharp edges. The radius of curvature of the edges directly controls the magnitude of these forces. These highly directional interactions, combined with local contact forces, give rise to a diverse array of cluster shapes. Our results open up new possibilities for the design of specific forces between macroscopic particles, directing their assembly, and actuating their motion.
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