Microchannels with Self-Pumping Walls.,ACS Nano

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Microchannels with Self-Pumping Walls.
ACS Nano ( IF 15.8 ) Pub Date : 2020-09-18 , DOI: 10.1021/acsnano.0c05826
Tingting Yu _{1,

2} , Athanasios G Athanassiadis ₁ , Mihail N Popescu ₁ , Vijayakumar Chikkadi ₁ , Achim Güth ₃ , Dhruv P Singh ₁ , Tian Qiu _{1,

2} , Peer Fischer _{1,

2}

Affiliation

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.

中文翻译：

具有自泵壁的微通道。

当不对称 Janus 微型马达固定在表面上时，它们充当化学动力微型泵，将流体中的化学能转化为整体流动。然而，这种泵以前只能产生局部再循环流，不能用于在一个方向上泵送流体。在这里，我们证明了一系列具有光化学活性的三维 Au/TiO ₂Janus 柱子可以抽水。在紫外线照射下，水分解反应迅速在活性表面上方产生定向体流。通过用这种活性表面衬里 2D 微通道，在通道内产生各种流动剖面。具有活动表面的通道的分析和数值模型预测的流动剖面与实验结果非常吻合。光驱动的活性表面提供了一种在小范围内无线泵送流体的方法，可用于复杂微流体网络中的实时、局部流量控制。

更新日期：2020-10-28

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