复杂粒子的介电电泳平衡
Dielectrophoretic Equilibrium of Complex Particles
摘要：
与常用的球形Janus颗粒相反，在这里我们使用了使用光刻技术制造的工程Janus颗粒，以精确控制其几何形状和涂覆区域。具体来说，我们研究了一个棒棒糖形状的复杂粒子，它的头部涂有黄金，而它的尾巴是裸露的。由于其独特的电特性（即电极化性），颗粒表现出力平衡，其中作用在其头部和尾部上的相反介电泳力恰好彼此抵消以产生稳定的平衡位置。这是在四极电极阵列中实现的，其中工程粒子的平衡位置可以通过频率来调谐。这与标准介电电泳行为形成对比，在标准介电电泳行为中，当分别从负介电电泳响应转变为正介电电泳响应时，粒子将位置从四边形的中心转变为电极的最边缘。这为自组装、生物传感、仿生精子等复杂颗粒的定位控制开辟了新的机会。
英文摘要：
In contrast to the commonly used spherical Janus particles, here we used engineered Janus particles that are fabricated using photolithography technique for precise control over their geometry and coated regions. Specifically, we studied a lollipop-shaped complex particle where its head is coated with gold while its tail is left bare. Due to their distinct electrical properties (i.e. electrical polarizability) the particle exhibits force equilibrium where opposite dielectrophoretic forces acting on its head and tail exactly cancel each other to yield a stable equilibrium position. This was realized in a quadrupolar electrode array where the equilibrium position of the engineered particle could be tuned by the frequency. This stands in contrast to the standard dielectrophoretic behavior where the particle shifts positions from either the center of the quad to the very edge of the electrodes when shifting from a negative to positive dielectrophoretic response, respectively. This opens new opportunities for positioning control of such complex particles for self-assembly, biosensing, biomimetic spermatozoa and more.
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