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Micromachines 2018, 9(2), 50;

Manipulating Microrobots Using Balanced Magnetic and Buoyancy Forces

School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China
Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China
Department of Micro-Nano Systems Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-0814, Japan
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 9 December 2017 / Revised: 16 January 2018 / Accepted: 24 January 2018 / Published: 29 January 2018
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We present a novel method for the three-dimensional (3D) control of microrobots within a microfluidic chip. The microrobot body contains a hollow space, producing buoyancy that allows it to float in a microfluidic environment. The robot moves in the z direction by balancing magnetic and buoyancy forces. In coordination with the motion of stages in the xy plane, we achieved 3D microrobot control. A microgripper designed to grasp micron-scale objects was attached to the front of the robot, allowing it to hold and deliver micro-objects in three dimensions. The microrobot had four degrees of freedom and generated micronewton-order forces. We demonstrate the microrobot’s utility in an experiment in which it grips a 200 μm particle and delivers it in a 3D space. View Full-Text
Keywords: micro-robot; three-dimension manipulation; microfluidic chip micro-robot; three-dimension manipulation; microfluidic chip

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Feng, L.; Wu, X.; Jiang, Y.; Zhang, D.; Arai, F. Manipulating Microrobots Using Balanced Magnetic and Buoyancy Forces. Micromachines 2018, 9, 50.

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