Magnetically locked Janus particle clusters with orientation-dependent motion in AC electric fields.
Magnetically locked Janus particle clusters with orientation-dependent motion in AC electric fields.
复制标题
磁锁 Janus 粒子簇在交流电场中具有方向相关的运动。
DOI：
10.1039/d3nr03744d
复制
发表时间：
2023
期刊：
影响因子：
6.7
通讯作者：
Shields4th,CWyatt
中科院分区：
文献类型：
--
作者：
Lee,JinGyun;Thome,CooperP;Cruse,ZoeA;Ganguly,Arkava;Gupta,Ankur;Shields4th,CWyatt
活性粒子，或称微型马达，在小范围内局部耗散能量以驱动运动。弹道的类型通常是固定的，并由粒子的几何形状和组成决定，使用传统的制造程序进行调整可能是具有挑战性的。在这里，我们报告了一种简单的、自下而上的方法，可以将镀金的聚苯乙烯Janus颗粒磁性地组装成在交流电场刺激下显示不同轨迹的“锁定”团簇。每个星团内粒子的取向导致了不同的运动模式，包括平移、旋转、摆线、螺旋线和轨道。我们使用一个简化的刚性珠子模型来模拟这个系统，并证明了预测的和实验观察到的团簇轨迹在定性上是一致的。总体而言，该系统提供了一种便捷的方法，可以从离散的积木块可扩展地创建具有一系列定义良好的运动的微电机。
Active particles, or micromotors, locally dissipate energy to drive locomotion at small length scales. The type of trajectory is generally fixed and dictated by the geometry and composition of the particle, which can be challenging to tune using conventional fabrication procedures. Here, we report a simple, bottom-up method to magnetically assemble gold-coated polystyrene Janus particles into “locked” clusters that display diverse trajectories when stimulated by AC electric fields. The orientation of particles within each cluster gives rise to distinct modes of locomotion, including translational, rotational, trochoidal, helical, and orbital. We model this system using a simplified rigid beads model and demonstrate qualitative agreement between the predicted and experimentally observed cluster trajectories. Overall, this system provides a facile means to scalably create micromotors with a range of well-defined motions from discrete building blocks.