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Magnetocapillary self-assemblies: Locomotion and micromanipulation along a liquid interface
Advances in Colloid and Interface Science ( IF 15.6 ) Pub Date : 2017-07-20 , DOI: 10.1016/j.cis.2017.07.019
G. Grosjean , M. Hubert , N. Vandewalle

This paper presents an overview and discussion of magnetocapillary self-assemblies. New results are presented, in particular concerning the possible development of future applications. These self-organizing structures possess the notable ability to move along an interface when powered by an oscillatory, uniform magnetic field. The system is constructed as follows. Soft magnetic particles are placed on a liquid interface, and submitted to a magnetic induction field. An attractive force due to the curvature of the interface around the particles competes with an interaction between magnetic dipoles. Ordered structures can spontaneously emerge from these conditions. Furthermore, time-dependent magnetic fields can produce a wide range of dynamic behaviours, including non-time-reversible deformation sequences that produce translational motion at low Reynolds number. In other words, due to a spontaneous breaking of time-reversal symmetry, the assembly can turn into a surface microswimmer. Trajectories have been shown to be precisely controllable. As a consequence, this system offers a way to produce microrobots able to perform different tasks. This is illustrated in this paper by the capture, transport and release of a floating cargo, and the controlled mixing of fluids at low Reynolds number.



中文翻译:

磁毛细管自组装:沿液体界面的运动和显微操纵

本文介绍了电磁毛细血管自组装的概述和讨论。提出了新的结果,特别是关于未来应用程序的可能开发。这些自组织结构在受到振荡的均匀磁场供电时,具有沿界面移动的显着能力。该系统的构造如下。将软磁性颗粒放置在液体界面上,并置于磁场中。由于粒子周围的界面的弯曲而产生的吸引力与磁偶极子之间的相互作用竞争。有条件的结构可以在这些条件下自发出现。此外,随时间变化的磁场会产生各种各样的动态行为,包括在低雷诺数下产生平移运动的非时间可逆形变序列。换句话说,由于时间反转对称性的自发破坏,组件可能会变成表面微游泳器。轨迹已被证明是精确可控的。结果,该系统提供了一种生产能够执行不同任务的微型机器人的方法。本文通过捕获,运输和释放浮动货物以及在低雷诺数下流体的受控混合来说明这一点。

更新日期:2018-07-08
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