am0c21021_si_002.mp4 (5.92 MB)
Download fileMagnetic Actuation of Hollow Swarming Spheres for Dynamic Catalysis
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posted on 2021-03-01, 23:06 authored by Shumin Liang, Yan Miao, Xiaoyan Zhu, Jiang Wei, Qing-Feng Zhan, Xinhua Huang, Lidong ZhangUntethered
robots with smart human–machine interactions
can execute complex activities such as target cargo delivery or assembly
of functional scaffolds. However, it remains challenging for fabricating
microscale hollow hydrogel robots that can go with autonomous transformation
of their geometric formations to adapt to unstructured environments.
We herein report hydrogel-based microscopic hollow swarming spheres
(HSSs) with anisotropic/isotropic alignments of Fe3O4 particles in the porous wall that can navigate under complex
topography conditions by altering their geometric formation, including
passing around or jumping over obstacles, assembling into various
formation patterns, and swimming in a high-viscosity system. We introduce
HSSs into a catalytic reaction model, in which HSSs as a catalyst
can shift between water and oil phases to initiate or terminate the
decomposition reaction of H2O2. This dynamic
catalysis is expected to construct free-radical “living”
polymerization for controlling the reaction rate and polymer dispersity
index in the future.
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Fe 3 O 4 particlesoil phasesdecomposition reactionreport hydrogel-basedMagnetic Actuationtopography conditionshigh-viscosity systemHSSformation patternsreaction modelpolymer dispersity indexhydrogel robotsreaction rateDynamic Catalysis Untethered robotsH 2 O 2target cargo deliveryHollow Swarming Spheres