School of Physics and Electronic Information, Shangrao Normal University, Shangrao 334001, China.
Soft Matter. 2019 Sep 18;15(36):7187-7194. doi: 10.1039/c9sm00853e.
We study the transport of inertial Brownian particles in steady laminar flows in the presence of two-dimensional Gaussian potentials. Through extensive numerical simulations, it is found that the transport is sensitively dependent on the external constant force and the Gaussian potential. Within tailored parameter regimes, the system exhibits a rich variety of transport behaviors. There exists the phenomenon of spontaneous rectification (SR), where the directed transport of particles can occur in the absence of any external driving forces. It is found that SR of the particles can be manipulated by the spatial position of the Gaussian potential. Moreover, when the potential lies at the center of the cellular flow, the system exhibits absolute negative mobility (ANM), i.e., the particles can move in a direction opposite to the constant force. More importantly, the phenomenon of ANM induced by Gaussian potentials is robust in a wide range of system parameters and can be further strengthened with the optimized parameters, which may pave the way to the implementation of related experiments.
我们研究了在二维高斯势存在下，惯性布朗粒子在稳定层流中的输运。通过广泛的数值模拟，发现输运对外部恒力和高斯势非常敏感。在定制的参数范围内，系统表现出丰富的输运行为。存在自发整流（SR）现象，即没有任何外部驱动力时，粒子的定向输运可以发生。发现粒子的 SR 可以通过高斯势的空间位置来控制。此外，当势位于细胞流的中心时，系统表现出绝对负迁移率（ANM），即粒子可以沿与恒力相反的方向移动。更重要的是，高斯势引起的 ANM 现象在广泛的系统参数范围内是稳健的，并且可以通过优化参数进一步增强，这可能为相关实验的实施铺平道路。
