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Issue 7, 2015
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Three-dimensional heterogeneous assembly of coded microgels using an untethered mobile microgripper

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Abstract

Three-dimensional (3D) heterogeneous assembly of coded microgels in enclosed aquatic environments is demonstrated using a remotely actuated and controlled magnetic microgripper by a customized electromagnetic coil system. The microgripper uses different ‘stick–slip’ and ‘rolling’ locomotion in 2D and also levitation in 3D by magnetic gradient-based pulling force. This enables the microrobot to precisely manipulate each microgel by controlling its position and orientation in all xyz directions. Our microrobotic assembly method broke the barrier of limitation on the number of assembled microgel layers, because it enabled precise 3D levitation of the microgripper. We used the gripper to assemble microgels that had been coded with different colours and shapes onto prefabricated polymeric microposts. This eliminates the need for extra secondary cross-linking to fix the final construct. We demonstrated assembly of microgels on a single micropost up to ten layers. By increasing the number and changing the distribution of the posts, complex heterogeneous microsystems were possible to construct in 3D.

Graphical abstract: Three-dimensional heterogeneous assembly of coded microgels using an untethered mobile microgripper

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Supplementary files

Article information


Submitted
02 Jan 2015
Accepted
17 Feb 2015
First published
17 Feb 2015

Lab Chip, 2015,15, 1667-1676
Article type
Paper
Author version available

Three-dimensional heterogeneous assembly of coded microgels using an untethered mobile microgripper

S. E. Chung, X. Dong and M. Sitti, Lab Chip, 2015, 15, 1667
DOI: 10.1039/C5LC00009B

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