电场驱动下布朗粒子在周期管道内的运动

The Migration of Brownian Particle Driven by Electrical Field in Periodical Channels

采用分子动力学方法模拟研究电场驱动下布朗粒子在周期管道内的运动.管道由a和b两部分周期排列而成,其中a管道对粒子有吸引作用,b管道对粒子有纯排斥作用.结果表明,粒子迁移率随电场强度的变化存在明显的跳变.当电场强度比较小时,迁移率趋于零,布朗粒子在a管道区域存在明显的受限过程;当电场强度比较大时,迁移率趋于1,布朗粒子在管道内呈现近自由运动.

The migration of Brownian particle in periodical channels under electrical force was studied by using molecular dynamics simulation.The channel walls are patterned periodically with part a and part b,where the interaction between Brownian particle and channel a is attractive,and that between Brownian particle and channel b is pure repulsive.Results show that there is an obvious jump for the dependence of the mobility on the strength of the electrical field.When the strength of the electrical field is small,the mobility is nearly 0,and the Brownian particle is trapped at channel a.While when the strength of the electrical field is big,the mobility is nearly 1,and the Brownian particle runs almost freely under the electrical force.