Zhu Jian, Chen Tianning, Chen Chen, Ding Wei
School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Materials (Basel). 2021 Aug 30;14(17):4939. doi: 10.3390/ma14174939.
Arranging microparticles into desired patterns, especially in a complicated pattern with a reliable and tunable manner, is challenging but highly desirable in the fields such as biomedicine and tissue engineering. To overcome these limitations, here, by using the concept of topology in acoustics, the valley vortex is utilized to manipulate particles on a large scale with complicated 2D patterns in the star-like sonic crystals at different frequencies. A topologically protected edge state is obtained at the interface of the crystals with different valley Hall phases, which shows the ability of reliable microparticles control along the sharp corner and the capability of robust particles cluster aggregation in a defective system. The results may provide intriguing resources for future microfluidic systems in a complicated and brittle environment.
将微粒排列成所需的图案，尤其是以可靠且可调节的方式排列成复杂的图案，在生物医学和组织工程等领域具有挑战性，但却非常令人期待。为了克服这些限制，在此，通过运用声学中的拓扑概念，利用谷涡在不同频率下对星状声子晶体中的微粒进行大规模复杂二维图案的操控。在具有不同谷霍尔相的晶体界面处获得了一种拓扑保护的边缘态，这展示了沿尖角可靠控制微粒的能力以及在缺陷系统中微粒强大的簇聚聚集能力。这些结果可能为未来在复杂且脆弱环境中的微流体系统提供有趣的资源。
