Tethered fleximags as artificial cilia
Tethered fleximags as artificial cilia
复制标题
DOI：
10.1017/s002211201100005x
复制
发表时间：
2011-07-01
影响因子：
3.7
通讯作者：
Du Roure, Olivia
中科院分区：
文献类型：
--
作者：
Babataheri, Avin;Roper, Marcus;Du Roure, Olivia
柔性超顺磁丝（“fleximags”）是非常细长的弹性丝，可以通过分布式磁扭矩驱动，以密切模仿生物鞭毛的行为。此前，Fleximags 已被用作能够运输小型货物的人造微型游泳器的基础，Dreyfus 等人。 （《自然》，第 437 卷，2005 年，第 862 页）。在这里，我们演示了如何将这些细丝固定在墙上，以制作密度可调的人造微磁性纤毛地毯。我们分析了人工纤毛在平面和三维跳动模式下的动力学。我们表明，动力学是由随驱动频率的平方根倒数变化的单个特征长度尺度控制的，提供了一种打破前后对称性并产生净通量和力的机制。然而，我们表明，丝动力学中有效的几何互易性对人工鞭毛在二维驱动时泵送流体的能力产生了内在的限制。
Flexible superparamagnetic filaments ('fleximags') are very slender elastic filaments, which can be driven by distributed magnetic torques to mimic closely the behaviour of biological flagella. Previously, fleximags have been used as a basis for artificial micro-swimmers capable of transporting small cargos Dreyfus et al. (Nature, vol. 437, 2005, p. 862). Here, we demonstrate how these filaments can be anchored to a wall to make carpets of artificial micro-magnetic cilia with tunable densities. We analyse the dynamics of an artificial cilium under both planar and three-dimensional beating patterns. We show that the dynamics are controlled by a single characteristic length scale varying with the inverse square root of the driving frequency, providing a mechanism to break the fore and aft symmetry and to generate net fluxes and forces. However, we show that an effective geometrical reciprocity in the filament dynamics creates intrinsic limitations upon the ability of the artificial flagellum to pump fluid when driven in two dimensions.