Propulsion of Bubble-Based Acoustic Microswimmers
Propulsion of Bubble-Based Acoustic Microswimmers
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DOI：
10.1103/physrevapplied.4.064012
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发表时间：
2015-12-29
影响因子：
4.6
通讯作者：
Marmottant, Philippe
中科院分区：
文献类型：
--
作者：
Bertin, Nicolas;Spelman, Tamsin A.;Marmottant, Philippe
声学微游泳者在微流体应用和靶向药物递送方面具有巨大的潜力。在这里，我们介绍了通过三维微加工制成的装甲微气泡（尺寸范围，10-20 μ m），即使在强制振荡下，气泡也可以持续数小时。结果表明，包覆微泡的声共振是由毛细力决定的，而不是由气体体积决定的，其测量结果与理论计算一致。进一步对气泡振动产生的净推进流量进行了实验测量和理论预测。由于流体的稳定流动，这种流动可以达到100mm /s，并受到附近壁面存在的影响。最后，运动中的微型游泳者被显示，无论是旋转装置还是自由游泳者。
Acoustic microswimmers present a great potential for microfluidic applications and targeted drug delivery. Here, we introduce armored microbubbles (size range, 10-20 mu m) made by three-dimensional microfabrication, which allows the bubbles to last for hours even under forced oscillations. The acoustic resonance of the armored microbubbles is found to be dictated by capillary forces and not by gas volume, and its measurements agree with a theoretical calculation. We further measure experimentally and predict theoretically the net propulsive flow generated by the bubble vibration. This flow, due to steady streaming in the fluid, can reach 100 mm/s, and is affected by the presence of nearby walls. Finally, microswimmers in motion are shown, either as spinning devices or free swimmers.