用于微流体推进的磁致动人工纤毛
Magnetically-actuated artificial cilia for microfluidic propulsion
摘要：
天然纤毛是毛发状的微管结构，能够通过不对称运动在低雷诺数下移动流体。在本文中，我们遵循仿生的方法来设计人工纤毛内衬微流体通道的内表面的目标，以推动流体。人造纤毛由填充有磁性纳米颗粒的聚合物膜组成。通过调节外部磁场来产生非对称、非往复运动。为了获得纤毛局部的磁场和相关磁化强度，我们求解麦克斯韦方程组，从中可以推导出磁矩。为了获得纤毛运动，我们解决了运动的动力学方程，然后完全耦合到描述纤毛周围的流体流动的流体动力学方程。通过这样做，我们表明，通过适当调整所施加的磁场，可以产生不对称的纤毛运动，能够推动微通道中的流体。结果是在三个无量纲参数，充分描绘的不对称性和周期时间作为弹性，惯性，磁性和粘性流体力的相对贡献的函数。
英文摘要：
Natural cilia are hair-like microtubule-based structures that are able to move fluid at low Reynolds number through asymmetric motion. In this paper we follow a biomimetic approach to design artificial cilia lining the inner surface of microfluidic channels with the goal to propel fluid. The artificial cilia consist of polymer films filled with magnetic nanoparticles. The asymmetric, non-reciprocating motion is generated by tuning an external magnetic field. To obtain the magnetic field and associated magnetization local to the cilia we solve the Maxwell equations, from which the magnetic torques can be deduced. To obtain the ciliary motion we solve the dynamic equations of motion which are then fully coupled to the fluid dynamic equations that describe fluid flow around the cilia. By doing so we show that by properly tuning the applied magnetic field, asymmetric ciliary motion can be generated that is able to propel fluid in a microchannel. The results are presented in terms of three dimensionless parameters that fully delineate the asymmetry and cycle time as a function of the relative contribution of elastic, inertial, magnetic and viscous fluid forces.
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