温度梯度与缺陷共同作用下的双壁碳纳米管持续驱动器件  

Continuous Driving Based on Defected Double Walled Carbon Nanotubes With Temperature Gradients

作　　者：傅晗昕 冷建涛 张田忠 FU Hanxin;LENG Jiantao;CHANG Tienchong(Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai Institute of Applied Mathematics and Mechanics,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学力学与工程科学学院、上海市应用数学和力学研究所、上海市能源工程力学重点实验室,上海200072

出　　处：《力学季刊》2023年第2期258-268,共11页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(12132008,11872238)。

摘　　要：纳尺度驱动因其在能量转换、物质输送等众多领域的潜在应用得到广泛关注,但实现长程持续驱动依然在原理上面临重大挑战.本文借助双壁碳纳米管的层间范德华相互作用,以热梯度力为基本动力,利用外管缺陷对层间热梯度力的调控作用,提出了一种新型的纳尺度可控持续驱动原理.其基本机理是:外管在周期性缺陷和温度场共同作用下形成周期性的非对称温度梯度,在内管上产生周期性的非对称热梯度力,使得每个周期(驱动单元)上都存在净驱动力,从而推动内管实现长程持续运动.同时,内管的运动方向或速度可通过外管上的控温区域或温差控制.Although nanoscale driving has received wide attention due to its potential applications in various fields such as energy conversion and material transportation,achieving long-range continuous driving still remains a major challenge.Here in this paper,we present a continuous yet controllable driving method based on the interlayer van der Waals interaction of double walled carbon nanotubes(DWCNTs),with thermal gradient force as the basic driving force and utilizing the tuning effect of the outer tube defects on the inter-layer temperature gradient.Under the combined effects of periodic defects and temperature field,the outer tube forms periodic asymmetric temperature gradient,and a periodic asymmetric thermal gradient force is generated on the inner tube,resulting in a net driving force on each cycle(driving unit),thereby driving the inner tube to achieve long-term continuous motion.The moving direction or speed of the inner tube can be controlled by the temperature control area or temperature difference on the outer tube.The proposed driving mechanism may have general implications for nanoscale continuous motion and energy conversion.

关 键 词：持续运动 碳纳米管 温度梯度 空位缺陷 分子动力学 

分 类 号：TB383.1[一般工业技术—材料科学与工程]