Water-Driven Micromotors
Water-Driven Micromotors
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DOI：
10.1021/nn303309z
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发表时间：
2012-09-01
期刊：
影响因子：
17.1
通讯作者：
Wang, Joseph
中科院分区：
文献类型：
--
作者：
Gao, Wei;Pei, Allen;Wang, Joseph
我们展示了第一个水驱动气泡推进微型马达的例子，它消除了对普通过氧化氢燃料的需求。新型水驱动Janus微电机由铝微粒和液态镓微接触混合制备的部分包覆Al-Ga二元合金微球组成。氢气泡从暴露的Al-Ga合金半球一侧喷出，当其与水接触时，提供强大的定向推力。这种自发产生的氢气泡反映了铝合金和水之间的快速反应。由此产生的水驱动球形马达可以以3 mm S(-1)(即150体长S(-1))的惊人速度移动，同时施加超过500Pn的大作用力。研究了影响铝-水反应效率以及由此产生的推进行为和电机寿命的因素，包括离子强度和环境pH。由此产生的水推进Al-Ga/Ti马达在不同的生物介质(如人血清)中有效地运动，并在各种生物医学或工业应用中具有相当大的前景。
We demonstrate the first example of a water-driven bubble-propelled micromotor that eliminates the requirement for the common hydrogen peroxide fuel. The new water-driven Janus micromotor is composed of a partially coated Al-Ga binary alloy microsphere prepared via microcontact mixing of aluminum microparticles and liquid gallium. The ejection of hydrogen bubbles from the exposed Al-Ga alloy hemisphere side, upon its contact with water, provides a powerful directional propulsion thrust. Such spontaneous generation of hydrogen bubbles reflects the rapid reaction between the aluminum alloy and water. The resulting water-driven spherical motors can move at remarkable speeds of 3 mm s(-1) (i.e., 150 body length s(-1)), while exerting large forces exceeding 500 pN. Factors influencing the efficiency of the aluminum-water reaction and the resulting propulsion behavior and motor lifetime, including the ionic strength and environmental pH, are investigated. The resulting water-propelled Al-Ga/Ti motors move efficiently in different biological media (e.g., human serum) and hold considerable promise for diverse biomedical or industrial applications.