Liu Pengzhan, Tian Zhenhua, Yang Kaichun, Naquin Ty Downing, Hao Nanjing, Huang Huiyu, Chen Jinyan, Ma Qiuxia, Bachman Hunter, Zhang Peiran, Xu Xiahong, Hu Junhui, Huang Tony Jun
Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA.
State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Sci Adv. 2022 Apr;8(13):eabm2592. doi: 10.1126/sciadv.abm2592. Epub 2022 Apr 1.
Acoustic black holes offer superior capabilities for slowing down and trapping acoustic waves for various applications such as metastructures, energy harvesting, and vibration and noise control. However, no studies have considered the linear and nonlinear effects of acoustic black holes on micro/nanoparticles in fluids. This study presents acoustofluidic black holes (AFBHs) that leverage controlled interactions between AFBH-trapped acoustic wave energy and particles in droplets to enable versatile particle manipulation functionalities, such as translation, concentration, and patterning of particles. We investigated the AFBH-enabled wave energy trapping and wavelength shrinking effects, as well as the trapped wave energy-induced acoustic radiation forces on particles and acoustic streaming in droplets. This study not only fills the gap between the emerging fields of acoustofluidics and acoustic black holes but also leads to a class of AFBH-based in-droplet particle manipulation toolsets with great potential for many applications, such as biosensing, point-of-care testing, and drug screening.
声学黑洞具有卓越的能力，可用于减慢和捕获声波，适用于多种应用，如超材料结构、能量收集以及振动和噪声控制。然而，尚无研究考虑过声学黑洞对流体中微/纳米粒子的线性和非线性效应。本研究提出了声流体黑洞（AFBHs），它利用被AFBH捕获的声波能量与液滴中的粒子之间的可控相互作用，实现多种粒子操控功能，如粒子的平移、聚集和图案化。我们研究了基于AFBH的波能量捕获和波长收缩效应，以及捕获的波能量对粒子产生的声辐射力和液滴中的声流。本研究不仅填补了新兴的声流体学领域与声学黑洞之间的空白，还带来了一类基于AFBH的液滴内粒子操控工具集，在生物传感、即时检测和药物筛选等众多应用中具有巨大潜力。
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