Versatile microparticle propulsion system by light-guided dielectrophoresis: Proposed method and theoretical calculation
Versatile microparticle propulsion system by light-guided dielectrophoresis: Proposed method and theoretical calculation
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DOI：
10.1063/5.0052117
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发表时间：
2021-08
影响因子：
3.2
通讯作者：
Zexi Liang;D. Fan
中科院分区：
文献类型：
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作者：
Zexi Liang;D. Fan
开发能够有效响应外部刺激的活性物质材料仍然是一个重大挑战，克服这一挑战将大大推动微机械和微型机器人向前所未有的生物医学，电子和颗粒分离应用的发展。在这里，我们提出了一种创新的工作机制，允许多折叠平移运动控制的半导体微实体的交流介电电泳与简单的可见光刺激。通过考虑Maxwell-Wagner弛豫和双电层荷电效应的模型化方法，研究了水悬浮液中不同几何形状的半导体颗粒所受的介电泳力.在此基础上，我们合理地设计了一种操纵系统，该系统可以通过调节电场中的光强度来同时将半导体传输并定向到所需的方向。这项研究可以为开发一种新型的微机械提供见解，这种微机械具有很少发现的控制灵活性和精度，并为分离和纯化不同几何形状的光电微粒提供了一条新的途径。
Developing materials for active matter that can efficiently respond to external stimuli with designed multifold mechanical motions remains a major challenge, and overcoming this will greatly propel the advancement of micromachines and microrobots toward unprecedented biomedical, electronic, and particle-separation applications. Here, we propose an innovative working mechanism that allows multifold-translational-motion control of semiconductor microentities by AC dielectrophoresis with simple visible-light stimulation. We study the dielectrophoresis forces on semiconducting particles of various geometries in aqueous suspension by modeling with the consideration of both the Maxwell–Wagner relaxation and the electrical-double-layer-charging effect. With the obtained understanding, we rationally design a manipulation system that can versatilely transport semiconductors and orient them toward desired directions simultaneously by tuning the light intensity in an electric field. This research could provide insights toward developing a new class of micromachines with rarely found control flexibility and precision and offer a new route toward separation and purification of optoelectric microparticles of different geometries.