在受限几何结构中控制扩散输运
Controlling diffusive transport in confined geometries
摘要：
我们分析了布朗粒子在具有周期性变化截面的窄通道中的扩散输运。几何约束导致熵障碍，颗粒必须克服以在传输方向上前进。的运输特性表现出独特的行为，这是在观察到的运输与纯粹的能量障碍的潜力。通过调节通道的几何参数，可以有效地调节输运和扩散性质。一个突出的例子是特定信道参数的扩散的最大化增强。通道形状的作用的理解提供了一种设计的风格化的通道，其中的质量的运输可以有效地优化的可能性。
英文摘要：
We analyze the diffusive transport of Brownian particles in narrow channels with periodically varying cross-section. The geometrical confinements lead to entropic barriers, the particle has to overcome in order to proceed in transport direction. The transport characteristics exhibit peculiar behaviors which are in contrast to what is observed for the transport in potentials with purely energetic barriers. By adjusting the geometric parameters of the channel one can effectively tune the transport and diffusion properties. A prominent example is the maximized enhancement of diffusion for particular channel parameters. The understanding of the role of channel-shape provides the possibility for a design of stylized channels wherein the quality of the transport can be efficiently optimized.
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