Reconfigurable engineered motile semiconductor microparticles.
Reconfigurable engineered motile semiconductor microparticles.
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DOI：
10.1038/s41467-018-04183-y
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发表时间：
2018-05-03
影响因子：
16.6
通讯作者：
Jokerst N
中科院分区：
文献类型：
--
作者：
Ohiri U;Shields CW 4th;Han K;Tyler T;Velev OD;Jokerst N
局部带电粒子是新出现的活性物质的基础。活性粒子的设计使它们的运动和组装受到控制。下一代粒子应该表现出对其主动组装、拆卸和重新配置的强大控制。在这里，我们介绍了一类可以使用标准微加工工具全面设计（尺寸，形状，电极化率和图案涂层）的半导体微粒。这些定制的硅颗粒从外部电场中吸收能量来主动推进，同时进行流体动力学相互作用，并根据需要顺序组装和拆卸。我们证明了许多电动力学效应，如介电电泳、感应电荷电泳和二极管推进，可以选择性地为微粒运动和相互作用提供动力。利用工程硅微粒实现按需运动、可处理的流体流动、同步运动和可逆组装的能力，可以实现包括远程供电微传感器、人造肌肉、可重构神经网络和计算系统在内的高级应用。表现出类似生命行为的活性粒子可能会在生物启发技术中得到应用，但实现按需重新配置仍然具有挑战性。在这里，作者展示了通过传统半导体方法制造的硅微粒的可控集体行为。
Locally energized particles form the basis for emerging classes of active matter. The design of active particles has led to their controlled locomotion and assembly. The next generation of particles should demonstrate robust control over their active assembly, disassembly, and reconfiguration. Here we introduce a class of semiconductor microparticles that can be comprehensively designed (in size, shape, electric polarizability, and patterned coatings) using standard microfabrication tools. These custom silicon particles draw energy from external electric fields to actively propel, while interacting hydrodynamically, and sequentially assemble and disassemble on demand. We show that a number of electrokinetic effects, such as dielectrophoresis, induced charge electrophoresis, and diode propulsion, can selectively power the microparticle motions and interactions. The ability to achieve on-demand locomotion, tractable fluid flows, synchronized motility, and reversible assembly using engineered silicon microparticles may enable advanced applications that include remotely powered microsensors, artificial muscles, reconfigurable neural networks and computational systems. Active particles that demonstrate life-like behavior may find use in bio-inspired technologies, but achieving on-demand reconfiguration remains challenging. Here, the authors demonstrate controllable, collective behavior in silicon microparticles, which are fabricated via conventional semiconductor methods.
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