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2017 ; 8
(ä): 15974
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Light controlled 3D micromotors powered by bacteria
#MMPMID28656975
Vizsnyiczai G
; Frangipane G
; Maggi C
; Saglimbeni F
; Bianchi S
; Di Leonardo R
Nat Commun
2017[Jun]; 8
(ä): 15974
PMID28656975
show ga
Self-propelled bacteria can be integrated into synthetic micromachines and act as
biological propellers. So far, proposed designs suffer from low reproducibility,
large noise levels or lack of tunability. Here we demonstrate that fast, reliable
and tunable bio-hybrid micromotors can be obtained by the self-assembly of
synthetic structures with genetically engineered biological propellers. The
synthetic components consist of 3D interconnected structures having a rotating
unit that can capture individual bacteria into an array of microchambers so that
cells contribute maximally to the applied torque. Bacterial cells are smooth
swimmers expressing a light-driven proton pump that allows to optically control
their swimming speed. Using a spatial light modulator, we can address individual
motors with tunable light intensities allowing the dynamic control of their
rotational speeds. Applying a real-time feedback control loop, we can also
command a set of micromotors to rotate in unison with a prescribed angular speed.