可控高速旋转的纳米线和纳米线微型电动机  

Controllable high speed rotation of nanowires and micromotors

作　　者：范冬蕾[1] 朱青[2] 罗伯特.卡玛拉塔 钱嘉陵[2] 

机构地区：[1]材料科学工程系约翰.霍普金斯大学 [2]物理与天文学系约翰.霍普金斯大学

出　　处：《物理》2006年第3期197-201,共5页Physics

基　　金：USANSF基金(No.DMR0403849)资助项目

摘　　要：文章报道了一种通过在微型电极上加交流电场,实现有控制地高速度转动纳米线的通用方法.纳米线的转动可以被瞬时启动或瞬时停止,转动速度(每分钟至少可达1800rpm),方向和总转动角度都可被精确控制.文章作者推导出了流体阻力在不同长度纳米线上施加的转矩,还用一根转动的纳米线作为微型电动机,推动灰尘颗粒做圆周运动.这种方法可以被用来转动磁性的或者非磁性的纳米线,甚至碳纳米管.这和微流机械,微搅动机,以及MEMS的关系显而易见.We report a versatile method for executing controllable high-speed rotation of nanowires by an AC electric field applied to strategically designed multiple microelectrodes. The rotation of the nanowires can be instantly switched on or off with precisely controlled rotation speed （to at least 1800 rpm）, definite chirality, and total angle of rotation. We have determined the viscous torque due to the fluidic drag force on nanowires of different lengths at extremely low Reynolds numbers on the level of 10 -5, which is not theoretically well known. We have also demonstrated a micromotor using a rotating bent nanowire driving a dust particle into circular motion. This method has been used to rotate magnetic and nonmagnetic nanowires as well as multi-wall carbon nanotubes. The relevance to microfluidic devices, microstirrers, and micro-electromechanical systems is apparent.

关 键 词：纳米线 微型电机系统 可控制高速转动 交流电场 纳米颗粒 

分 类 号：TM38[电气工程—电机]