Laocharoensuk Rawiwan, Burdick Jared, Wang Joseph
Biodesign Institute, Department of Chemical Engineering, Arizona State University, Tempe, Arizona 85287, USA.
ACS Nano. 2008 May;2(5):1069-75. doi: 10.1021/nn800154g.
Synthetic nanoscale motors represent a major step toward the development of practical nanomachines. Despite impressive progress, man-made nanomachines lack the efficiency and speed of their biological counterparts. Here we show that the incorporation of carbon nanotubes (CNT) into the platinum (Pt) component of asymmetric metal nanowire motors leads to dramatically accelerated movement in hydrogen-peroxide solutions, with average speeds (50-60 microm/s) approaching those of natural biomolecular motors. Further acceleration to 94 microm/s, with some motors moving above 200 microm/sis observed upon adding hydrazine to the peroxide fuel. Factors influencing the accelerated movement, including the CNT loading and fuel concentration, are examined. Such development of highly efficient and controllable nanomotors offers great promise for self-powered nanoscale transport and delivery systems.
合成纳米级马达代表了实用纳米机器发展的重要一步。尽管取得了令人瞩目的进展，但人造纳米机器仍缺乏其生物对应物的效率和速度。在此我们表明，将碳纳米管（CNT）并入不对称金属纳米线马达的铂（Pt）组件中，会使在过氧化氢溶液中的运动显著加速，平均速度（50 - 60微米/秒）接近天然生物分子马达的速度。在向过氧化物燃料中添加肼后，可观察到进一步加速至94微米/秒，一些马达的移动速度超过200微米/秒。研究了影响加速运动的因素，包括碳纳米管负载量和燃料浓度。这种高效且可控的纳米马达的发展为自驱动纳米级运输和递送系统带来了巨大希望。
