受驱无序胶体动力学  

DYNAMICS OF DRIVEN DISORDERED COLLOIDS

作　　者：陈江星[1] 曹义刚[1] 焦正宽[1] 

机构地区：[1]浙江大学物理系,杭州310027

出　　处：《低温物理学报》2003年第4期296-299,共4页Low Temperature Physical Letters

基　　金：国家重点基础研究专项经费 (批准号 :NKBRSF G1 9990 6 4 6 );教育部留学回国人员基金;中国国家博士后科研基金项目部分资助~~

摘　　要：利用Langevin分子动力学 ,本文数值研究点钉扎中心随机分布的二维胶体动力学 .随着钉扎中心强度的提高 ,我们发现了从弹性脱钉到塑性脱钉的渡越 ,并伴随临界钉扎力在渡越区的明显提高 ,类似于超导体中的峰值效应 .另外 ,我们首次发现 :当塑性流动发生时 ,高速运动胶体粒子感受到的平均钉扎力在从玻璃态到液态的转变过程中会出现峰值效应 ,并伴随有速度Using Langevin simulations, we numerically study the dynamics of driven 2D colloids subject to the randomly distributed point like pinning centers. With increasing the strength of pinning centers, we find a crossover from elastic to plastic depinnings, where a substantial increase in the depinning force is observed, analogous to the peak effect in superconductors. We find for the first time, when the plastic flow occurs, the average pinning force that colloids feel in the linear flow region shows a peak across the colloid glass to colloid liquid transition. The peak is accompanied by a clear crossing of the velocity versus driving force curves.

关 键 词：点钉扎中心 二维胶体动力学 峰值效应 胶子晶体 Langevin分子动力学 受驱无序胶体动力学 

分 类 号：TB301[一般工业技术—材料科学与工程]