Orozco Jahir, Jurado-Sánchez Beatriz, Wagner Gregory, Gao Wei, Vazquez-Duhalt Rafael, Sattayasamitsathit Sirilak, Galarnyk Michael, Cortés Allan, Saintillan David, Wang Joseph
Department of Nanoengineering, University of California San Diego , La Jolla, California 92093, United States.
Langmuir. 2014 May 13;30(18):5082-7. doi: 10.1021/la500819r. Epub 2014 May 1.
Fluid convection and mixing induced by bubble-propelled tubular microengines are characterized using passive microsphere tracers. Enhanced transport of the passive tracers by bubble-propelled micromotors, indicated by their mean squared displacement (MSD), is dramatically larger than that observed in the presence of catalytic nanowires and Janus particle motors. Bubble generation is shown to play a dominant role in the effective fluid transport observed in the presence of tubular microengines. These findings further support the potential of using bubble-propelled microengines for mixing reagents and accelerating reaction rates. The study offers useful insights toward understanding the role of the motion of multiple micromotors, bubble generation, and additional factors (e.g., motor density and fuel concentration) upon the observed motor-induced fluid transport.
利用被动微球示踪剂对由气泡驱动的管状微发动机引起的流体对流和混合进行了表征。通过其均方位移（MSD）表明，气泡驱动的微马达对被动示踪剂的增强传输显著大于在催化纳米线和Janus粒子马达存在下观察到的传输。结果表明，气泡产生在管状微发动机存在下观察到的有效流体传输中起主导作用。这些发现进一步支持了使用气泡驱动的微发动机来混合试剂和加速反应速率的潜力。该研究为理解多个微马达的运动、气泡产生以及其他因素（如马达密度和燃料浓度）对观察到的马达诱导流体传输的作用提供了有用的见解。
