Do magnetic micro-swimmers move like eukaryotic cells?
Do magnetic micro-swimmers move like eukaryotic cells?
复制标题
磁性微型游泳者能像真核细胞一样移动吗？
DOI：
10.1098/rspa.2007.0285
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
H. Stone
中科院分区：
文献类型：
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作者：
Marcus L. Roper;R. Dreyfus;J. Baudry;M. Fermigier;J. Bibette;H. Stone
微机械加工的最新进展允许非常小的货物，如单个红细胞，通过给它们配备由聚合物桥连接在一起的微米大小的顺磁性颗粒制成的尾巴来移动。当一个随时间变化的磁场施加到这样的灯丝，它从一边到另一边弯曲，并推动自己通过流体，拖动后面it.Here的负载，实验数据和数学模型显示的游泳速度和方向的磁性微型游泳者的依赖可调参数，如磁场强度和频率和灯丝长度。细丝的推进力来自自由端和拴系端之间弯曲波的传播：在这里，我们表明，这使微型游泳者的步态是真核细胞和摇摆的弹性杆之间的中间。最后，我们从模型中提取设计原则，通过调整实验参数构建最快的游泳微型游泳者。
Recent advances in micro-machining allow very small cargos, such as single red blood cells, to be moved by outfitting them with tails made of micrometre-sized paramagnetic particles yoked together by polymer bridges. When a time-varying magnetic field is applied to such a filament, it bends from side to side and propels itself through the fluid, dragging the load behind it. Here, experimental data and a mathematical model are presented showing the dependence of the swimming speed and direction of the magnetic micro-swimmer upon tunable parameters, such as the field strength and frequency and the filament length. The propulsion of the filament arises from the propagation of bending waves between free and tethered ends: here we show that this gives the micro-swimmer a gait that is intermediate between a eukaryotic cell and a waggled elastic rod. Finally, we extract from the model design principles for constructing the fastest swimming micro-swimmer by tuning experimental parameters.