Rapid acoustophoretic motion of microparticles manipulated by phononic crystals
Rapid acoustophoretic motion of microparticles manipulated by phononic crystals
复制标题
声子晶体操纵微粒的快速声泳运动
DOI：
10.1063/1.5052045
复制
发表时间：
2018-10-22
影响因子：
4
通讯作者：
Zheng, Hairong
中科院分区：
文献类型：
--
作者：
Li, Fei;Xiao, Yang;Zheng, Hairong
研究了在声流诱导拖曳力和声辐射力共同作用下，声子晶体板上微粒的声泳运动。在体声波和表面声波器件中，通过PCP可以实现比传统驻波快得多的声泳。该机制是由于显着增强ASF和ARF起源于一个无泄漏的零阶反对称Lamb模式的共振激发固有的板，这产生了高度本地化的场垂直于表面和周期性的场平行于表面。我们还证明了从ASF为主的声泳ARF为主的声泳作为粒径的函数的过渡。所提出的有限元模型预测的轨迹和速度的声泳粒子是在合理的协议与实验现象。这项研究将有助于开发简单的，可扩展的，集成的，一次性的声子晶体为基础的声流体系统的生物医学应用，如快速混合，细胞捕获，分选和图案化。由AIP出版社出版。
We present the acoustophoretic motion of microparticles simultaneously driven by the acoustic streaming induced drag force (ASF) and acoustic radiation force (ARF) on a phononic crystal plate (PCP). A much faster acoustophoresis can be achieved via a PCP than a traditional standing wave in bulk and surface acoustic wave devices. The mechanism is attributed to the significantly enhanced ASF and ARF originating from the resonant excitation of a nonleaky zero-order antisymmetric Lamb mode intrinsically in the plate, which generates the highly localized field vertical to the surface and periodic field parallel to the surface. We also demonstrate the transition from the ASF dominated acoustophoresis to ARF dominated acoustophoresis as a function of particle size. The predicted trajectories and velocity of acoustophoretic particles by the proposed finite element model are in reasonable agreement with experimental phenomena. This study would aid the development of simple, scalable, integrated, and disposable phononic crystal based acoustofluidic systems for biomedical applications such as rapid mixing, cell trapping, sorting, and patterning. Published by AIP Publishing.