Hydrodynamic coupling melts acoustically levitated crystalline rafts

Author:

Wu Brady12ORCID,VanSaders Bryan12ORCID,Lim Melody X.12ORCID,Jaeger Heinrich M.12

Affiliation:

1. Department of Physics, University of Chicago, Chicago, IL 60637

2. James Franck Institute, University of Chicago, Chicago, IL 60637

Abstract

Going beyond the manipulation of individual particles, first steps have recently been undertaken with acoustic levitation in air to investigate the collective dynamical properties of many-body systems self-assembled within the levitation plane. However, these assemblies have been limited to two-dimensional, close-packed rafts where forces due to scattered sound pull particles into direct frictional contact. Here, we overcome this restriction using particles small enough that the viscosity of air establishes a repulsive streaming flow at close range. By tuning the particle size relative to the characteristic length scale for viscous streaming, we control the interplay between attractive and repulsive forces and show how particles can be assembled into monolayer lattices with tunable spacing. While the strength of the levitating sound field does not affect the particles’ steady-state separation, it controls the emergence of spontaneous excitations that can drive particle rearrangements in an effectively dissipationless, underdamped environment. Under the action of these excitations, a quiescent particle lattice transitions from a predominantly crystalline structure to a two-dimensional liquid-like state. We find that this transition is characterized by dynamic heterogeneity and intermittency, involving cooperative particle movements that remove the timescale associated with caging for the crystalline lattice. These results shed light on the nature of athermal excitations and instabilities that can arise from strong hydrodynamic coupling among interacting particles.

Funder

National Science Foundation

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Direct measurement of forces in air-based acoustic levitation systems;Review of Scientific Instruments;2024-09-01

2. Acoustic manipulation of multi-body structures and dynamics;Reports on Progress in Physics;2024-05-15

3. Thunder and lightning: a revolution in wave-matter interactions;Complex Light and Optical Forces XVIII;2024-03-12

4. Hydrodynamic coupling melts acoustically levitated crystalline rafts;Proceedings of the National Academy of Sciences;2023-07-10

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