Journal
ACS NANO
Volume 12, Issue 3, Pages 2539-2545Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b08344
Keywords
colloid motor; magnetic actuation; cell manipulation; cell patterning
Categories
Funding
- National Science Foundation of China [21573053, 61573121]
- National Postdoctoral Program for Innovative Talents [BX201700065]
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We report a magnetically actuated peanut-shaped hematite colloid motor that can not only move in a rolling or wobbling mode in fluids but also perform single cell manipulation and patterning in a noncontact way. The peanut motor in a rolling mode can reach a maximal velocity of 10.6 mu m s(-1) under a rotating magnetic field of 130 Hz and 6.3 mT and achieve a more precisely controllable motion in predefined tracks. While in a wobbling mode, the motor reaches a maximal velocity of 14.5 mu m s(-1) under a conical rotating magnetic field of 80 Hz and 6.3 mT and can climb over steep slopes to adapt the motor for more complex environments. The fluid flow simulation results reveal that the difference between two movement modes mostly comes from the distribution discrepancy of the flow fields near the motors. Through the integration of the rolling and wobbling movement, these peanut motors can autonomously transport and release cells to a predefined site and thus form complex cell patterns without a physical contact. Such magnetically actuated peanut colloid motors afford a biofriendly technique for manipulation and patterning of cells, cell measurements, and intracellular communication investigations.
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