Institute of Robotics and Intelligent Systems, ETH Zurich, CH-8092 Zurich, Switzerland.
ACS Nano. 2010 Oct 26;4(10):6228-34. doi: 10.1021/nn101861n.
We show that rotating Ni nanowires are capable of propulsion and transport of colloidal cargo near a complex surface. When dissimilar boundary conditions exist at the two ends of a nanowire, such as when a nanowire is near a wall, tumbling motion can be generated that leads to propulsion of the nanowire. The motion of the nanowire can be precisely controlled using a uniform rotating magnetic field. We investigate the propulsion mechanism and the trajectory of the nanowire during the tumbling motion and demonstrate cargo transport of a polystyrene microbead by the nanowire over a flat surface or across an open microchannel. The results imply that functionalized, ferromagnetic one-dimensional, tumbling nanostructures can be used for cell manipulation and targeted drug delivery in a low Reynolds number aqueous environment.
我们证明了旋转的镍纳米线能够在复杂表面附近推动和运输胶体货物。当纳米线的两端存在不同的边界条件时，例如纳米线靠近壁面时，会产生翻滚运动，从而导致纳米线的推进。通过使用均匀旋转磁场可以精确控制纳米线的运动。我们研究了翻滚运动期间纳米线的推进机制和轨迹，并通过纳米线在平面上或穿过开放式微通道展示了聚苯乙烯微球的货物运输。结果表明，功能化的、铁磁的一维翻滚纳米结构可用于在低雷诺数水环境中进行细胞操作和靶向药物输送。
