温度梯度驱动下水银在石墨烯表面的运动特性  

Motion Behavior of the Mercury Droplet on the Graphene Surface Driven by the Temperature Gradient

作　　者：董鑫[1] 张忠强[1] 程广贵[1] 郭立强[1] 葛道晗[1] 王晓东[1] 

机构地区：[1]江苏大学微纳米科学技术研究中心,江苏镇江212013

出　　处：《微纳电子技术》2015年第7期439-445,共7页Micronanoelectronic Technology

基　　金：国家自然科学基金面上项目(11472117;11372298)

摘　　要：采用分子动力学模拟的方法,探究温度梯度驱动下水银在石墨烯表面的流动特性。重点研究了石墨烯的全局热振荡对石墨烯表面水银运动的影响。研究表明:在稳定的温度梯度下,单层石墨烯模型与刚体石墨烯模型的表面温度均呈近似线性分布,但刚体石墨烯模型表面温度分布的线性特征更加明显;同时,石墨烯表面水银液滴在温度梯度驱动下从高温区域向低温区域运动,且水银液滴在石墨烯表面流动的速度、加速度均随温度梯度的增大而增大。提出了刚体石墨烯模型。研究结果表明,石墨烯的全局热振荡所产生的驱动力方向与水银液滴在石墨烯表面的运动方向相同,均由高温区域指向低温区域。Using the molecular dynamics（MD）simulation,the flow characteristics of the mercury droplet on the graphene surface driven by temperature gradient was explored.The effect of the overall thermal oscillation of the graphene on the motion behavior of the mercury droplet on the graphene surface was mainly studied.The research shows that under the stable temperature gradient,the temperature distributions on the surfaces of the monolayer graphene and rigid graphene models are approximately linear.And the linear characteristic of the temperature distribution on the rigid graphene model surface is more obvious.Meanwhile,the mercury droplet driven by the temperature gradient moves from the high temperature zone to the low temperature zone,and the flow velocity and acceleration of the mercury droplet increase with the increase of the temperature gradient.The rigid graphene model was proposed.The research results show that the driving direction generated by the overall thermal oscillation of the graphene is consistent with the motion direction of the mercury droplet on the graphene surface,which is from the high temperature zone to the low temperature zone.

关 键 词：微电子机械系统(MEMS) 分子动力学(MD) 石墨烯 温度梯度 热振荡 

分 类 号：O357.1[理学—流体力学]