Magnetic Microlassos for Reversible Cargo Capture, Transport, and Release.
Magnetic Microlassos for Reversible Cargo Capture, Transport, and Release.
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DOI：
10.1021/acs.langmuir.7b00357
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发表时间：
2017-06-13
期刊：
影响因子：
--
通讯作者：
Marr DWM
中科院分区：
文献类型：
--
作者：
Yang T;Tasci TO;Neeves KB;Wu N;Marr DWM
近年来，微型机器人推进作为克服微尺度流体力学公认的可逆性和挑战性的人工方法越来越受到人们的关注。虽然受控移动是微型机器人行动的一个重要特征，但许多设想的应用也涉及货物运输，其中微型机器人必须能够根据命令装卸内容物，同时容忍复杂的溶液化学。在这里，我们介绍了一种物理方法，它使用柔性的和连接的超顺磁性胶体链，它可以在平面旋转磁场存在的情况下形成闭合环或套索。通过在垂直于衬底的方向上加一个附加的交流磁场，我们可以使套索以倾斜的外倾角定向。我们证明了这些磁性套索可以以相当大的速度滚动，通过操纵场强和相位滞后来进行精确的空间控制。此外，套索可以卷曲并紧紧抓住货物，并基于轮式机构进行运输。在目标目的地，货物在现场移动后很容易释放，套索可以很容易地重复使用。由于整个过程是物理控制的，不涉及任何连接或脱离的化学物质，因此我们的系统可能用于在不同溶液条件下运输不同类型的货物。
Microbot propulsion has seen increasing interest in recent years as artificial methods that overcome the well-established reversible and challenging nature of microscale fluid mechanics. While controlled movement is an important feature of microbot action, many envisioned applications also involve cargo transport where microbots must be able to load and unload contents on command while tolerating complex solution chemistry. Here we introduce a physical method that uses flexible and linked superparamagnetic colloidal chains, which can form closed rings or “lassos” in the presence of a planar rotating magnetic field. By adding an additional AC magnetic field along the direction perpendicular to the substrate, we can orient the lasso at a tilted camber angle. We show that these magnetic lassos can roll at substantial velocities, with precise spatial control by manipulating both field strength and phase lag. Moreover, the lasso can curl around and capture cargo tightly and transport it based on a wheel-type mechanism. At the targeted destination, cargo is easily released upon field removal and the lasso can be readily reused. Since the entire process is physically controlled with no chemistry for attachment or disengagement involved, our system can potentially be used for transporting diverse types of cargo under different solution conditions.
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