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首页> 外文期刊>The Journal of Chemical Physics >Directed drift and fluid pumping of nanoswimmers by periodic rectification-diffusion
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Directed drift and fluid pumping of nanoswimmers by periodic rectification-diffusion

机译：定期整流 - 扩散的定向漂移和流体泵送纳米摩尔

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摘要

The steady ratchet transport of run-and-tumble nanoswimmers in a 3D microfluidic channel constructed by periodic chambers separated by half-cylinder funnels is explored by dissipative particle dynamics. Two regions in a chamber are identified: rectification and active diffusion. While the concentration gradient is driven by the concentration jump in the rectification region, the ratchet current is dominated by the diffusion rate in the active diffusion region, which is classified into normal and Knudsen types. The former obeys Fick's law and is proportional to v(a)(2)tau, where v(a) is the self-propulsion velocity and tau the run time. In addition, autonomous pumping of fluids is induced by aligned force dipoles associated with nanoswimmers accumulated near funnels, similar to the mechanism of bacteria carpet. The direction of fluid flow is the same as that of the ratchet current but the former is one order of magnitude smaller than the latter. Thus, the fluid velocity depends on the characteristics of nanoswimmers.
机译：通过耗散颗粒动力学探索由半缸漏斗分开的周期性腔室构造的3D微流体通道中的延续隆起纳米摩擦稳定棘轮传输。鉴定腔室中的两个区域：整流和主动扩散。虽然浓度梯度被整流区域中的浓度跳跃驱动，但是棘轮电流通过主动扩散区域中的扩散速率支配，其被分类为正常和knudsen类型。前obeys fick的法律和与v（a）（2）Tau成正比，其中V（a）是自我推进速度和运行时的Tau。此外，通过与底线附近累积的纳米换锭子相关的对准力偶极子诱导流体的自主泵送，类似于细菌地毯的机制。流体流动的方向与棘轮电流的方向相同，但是前者是比后者小的一个量级。因此，流体速度取决于纳米纺的特性。

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