Ultrasound-Modulated Bubble Propulsion of Chemically Powered Microengines

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• 作者：Tailin Xu ; Fernando Soto ; Wei Gao ; Victor Garcia-Gradilla ; Jinxing Li ; Xueji Zhang ; Joseph Wang
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：June 18, 2014
• 年：2014
• 卷：136
• 期：24
• 页码：8552-8555
• 全文大小：246K
• 年卷期：v.136,no.24(June 18, 2014)
• ISSN：1520-5126

文摘

The use of an ultrasound (US) field for rapid and reversible control of the movement of bubble-propelled chemically powered PEDOT/Ni/Pt microengines is demonstrated. Such operation reflects the US-induced disruption of normal bubble evolution and ejection, essential for efficient propulsion of catalytic microtubular engines. It offers precise speed control, with sharp increases and decreases of the speed at low and high US powers, respectively. A wide range of speeds can thus be generated by tuning the US power. Extremely fast changes in the motor speed (<0.1 s) and reproducible 鈥淥n/Off鈥?activations are observed, indicating distinct advantages compared to motion control methods based on other external stimuli. Such effective control of the propulsion of chemically powered microengines, including remarkable 鈥渂raking鈥?ability, holds considerable promise for diverse applications.