How entropy and hydrodynamics cooperate in rectifying particle transport
How entropy and hydrodynamics cooperate in rectifying particle transport
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DOI：
10.1140/epjst/e2013-02029-4
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
S. Martens;G. Schmid;A. V. Straube;L. Schimansky-Geier;P. Hänggi
中科院分区：
文献类型：
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作者：
S. Martens;G. Schmid;A. V. Straube;L. Schimansky-Geier;P. Hänggi
使用分析Fick-Jacobs近似形式主义和广泛的布朗动力学模拟，我们研究粒子通过二维周期性通道与三角形壁的传输。定向运动是由沿着通道轴作用的恒定偏压和压力驱动流的相互作用引起的。特别是，我们分析了粒子的迁移率和有效扩散系数。熵整流的机制，揭示了一个破碎的空间反射对称性的存在下，流体动力学强制熵捕获的渠道。由于强制和压力驱动流场的组合作用，实现了具有显著降低的扩散率的有效整流。
Using the analytical Fick-Jacobs approximation formalism and extensive Brownian dynamics simulations we study particle transport through two-dimensional periodic channels with triangularly shaped walls. Directed motion is caused by the interplay of constant bias acting along the channel axis and a pressure-driven flow. In particular, we analyze the particle mobility and the effective diffusion coefficient. The mechanisms of entropic rectification is revealed in channels with a broken spatial reflection symmetry in presence of hydrodynamically enforced entropic trapping. Due to the combined action of the forcing and the pressure-driven flow field, efficient rectification with a drastically reduced diffusivity is achieved.