杰纳斯
微流控
材料科学
流量(数学)
微型反应器
纳米技术
微通道
流体力学
杰纳斯粒子
明渠流量
流量控制(数据)
光电子学
机械
化学
物理
计算机科学
催化作用
生物化学
计算机网络
作者
Tingting Yu,Athanasios G. Athanassiadis,Mihail N. Popescu,Vijayakumar Chikkadi,Achim Güth,Dhruv Singh,Tian Qiu,Peer Fischer
出处
期刊:ACS Nano
[American Chemical Society]
日期:2020-09-18
卷期号:14 (10): 13673-13680
被引量:36
标识
DOI:10.1021/acsnano.0c05826
摘要
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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