Inspired by the collective
behavior of natural living systems, the collective behavior of micromotors
has become the research highlight. Although great progress has been
made, it is still challenging to control the collective behavior of
micromotors. In this paper, we demonstrate a novel near-infrared (NIR)
light-powered micromotor consisting of a polystyrene microsphere and
a polydopamine core–shell structure (PS@PDA) with concentration-dependent
motion direction reversal and dynamic swarming behavior. Among others,
a single micromotor exhibits negative phototaxis, whereas a group
of micromotors shows positive phototaxis, which can be attributed
to the competition between the thermophoretic force and hydrodynamic
drag caused by the thermal buoyancy. In addition, because of the reversible
hydrogen bonding and π–π stacking interactions
between the adjacent PS@PDA micromotors, they form aggregation as
a result of the positive phototaxis with dynamically controllable
shapes tuned by the irradiation position, which makes them potentially
attractive for in-solution calligraphy and painting. It is anticipated
that the current study may not only provide a new strategy to control
the collective behavior of the micromotors, but also promote their
application in the practical field.
The improved photocatalytic redox activity over AgI/AgVO3 nanocomposites is ascribed to efficient separation of photoinduced electrons/holes via a Z-scheme bridge mechanism.
A novel high-energy-density zinc–iodine hybrid supercapacitor was designed via the introduction of a redox iodide ion electrolyte and B, N dual-doped carbon electrode.
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