Characterizing the Swimming Properties of Artificial Bacterial Flagella
Characterizing the Swimming Properties of Artificial Bacterial Flagella
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DOI：
10.1021/nl901869j
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发表时间：
2009-10-01
期刊：
影响因子：
10.8
通讯作者：
Nelson, Bradley J.
中科院分区：
文献类型：
--
作者：
Zhang, Li;Abbott, Jake J.;Nelson, Bradley J.
人工细菌鞭毛(ABF)是由螺旋状纳米带自卷曲而成的类似天然鞭毛的螺旋尾巴和由Cr/Ni/Au叠层薄膜组成的软磁头组成的。ABF是使用低强度旋转磁场进行无线控制的。像这样的自行式装置在体外和体内的生物医学应用中都很有兴趣。游动试验表明，当外加磁场的频率低于动静压的跳跃频率时，外加磁场的频率与平动速度成线性关系。此外，还研究了头部尺寸对ABF在固体边界附近的游动速度和横向漂移的影响。发展了一种在光学显微镜下估计螺旋游泳者推进矩阵的实验方法，最后演示了作为单个实体控制的多个ABF的类群行为。
Artificial bacterial flagella (ABFs) consist of helical tails resembling natural flagella fabricated by the self-scrolling of helical nanobelts and soft-magnetic heads composed of Cr/Ni/Au stacked thin films. ABFs are controlled wirelessly using a low-strength rotating magnetic field. Self-propelled devices such as these are of interest for In vitro and in vivo biomedical applications. Swimming tests of ABFs show a linear relationship between the frequency of the applied field and the translational velocity when the frequency Is lower than the step-out frequency of the ABF. Moreover, the influences of head size on swimming velocity and the lateral drift of an ABF near a solid boundary are Investigated. An experimental method to estimate the propulsion matrix of a helical swimmer under a light microscope Is developed, Finally, swarm-like behavior of multiple ABFs controlled as a single entity is demonstrated.