Journal
SMALL
Volume 18, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202105302
Keywords
active matter; dissipative self-organization; energy conversion; light-driven motor; microrobot; scallop theorem; symmetry breaking
Categories
Funding
- JSPS KAKENHI [JP18H05423, JP20H04622]
- MEXT through the Program for Leading Graduate Schools (Hokkaido University Ambitious Leader's Program)
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The study achieved directional swimming of microcrystals and explored the mechanism and features of crystal flapper morphology and swimming behavior.
A key goal in developing molecular microrobots that mimic real-world animal dynamic behavior is to understand better the self-continuous progressive motion resulting from collective molecular transformation. This study reports, for the first time, the experimental realization of directional swimming of a microcrystal that exhibits self-continuous reciprocating motion in a 2D water tank. Although the reciprocal flip motion of the crystals is like that of a fish wagging its tail fin, many of the crystals swam in the opposite direction to which a fish would swim. Here the directionality generation mechanism and physical features of the swimming behavior is explored by constructing a mathematical model for the crystalline flapper. The results show that a tiny crystal with a less-deformable part in its flip fin exhibits a pull-type stroke swimming, while a crystal with a fin that uniformly deforms exhibits push-type kicking motion.
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