期刊
ACS NANO
卷 14, 期 10, 页码 13673-13680出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c05826
关键词
chemical micropump; active surfaces; Janus structured surfaces; microfluidics; photocatalysts
类别
资金
- DFG [253407113, 1726]
- Volkswagen Foundation
- Vector Foundation
When asymmetric Janus micromotors are immobilized on a surface, they act as chemically powered micropumps, turning chemical energy from the fluid into a bulk flow. However, such pumps have previously produced only localized recirculating flows, which cannot be used to pump fluid in one direction. Here, we demonstrate that an array of three-dimensional, photochemically active Au/TiO2 Janus pillars can pump water. Upon UV illumination, a water-splitting reaction rapidly creates a directional bulk flow above the active surface. By lining a 2D microchannel with such active surfaces, various flow profiles are created within the channels. Analytical and numerical models of a channel with active surfaces predict flow profiles that agree very well with the experimental results. The light-driven active surfaces provide a way to wirelessly pump fluids at small scales and could be used for real-time, localized flow control in complex microfluidic networks.
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