Enhanced Transport into and out of Dead-End Pores
Enhanced Transport into and out of Dead-End Pores
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DOI：
10.1021/nn506216b
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发表时间：
2015-01-01
期刊：
影响因子：
17.1
通讯作者：
Velegol, Darrell
中科院分区：
文献类型：
--
作者：
Kar, Abhishek;Chiang, Tso-Yi;Velegol, Darrell
终端微纳米通道在自然界中普遍存在，在地质和生物系统中也经常被发现。通过传统的压力驱动机制无法实现流体在其中的流动。在这里，我们表明，化学驱动的对流流动导致运输进出死角孔可以发生瞬态扩散渗透现象。平流速度取决于现场产生的瞬态离子梯度和孔壁上的本征电荷的存在。水流的速度可达50 μ m/s，并使原本被困住的物质被提取出来。我们的研究结果表明，化学能，以瞬态盐梯度的形式，可以转换为机械运动，孔壁作为泵。如前所述，这种现象可能是在许多地质和生物系统中观察到的涉及紧密或死角微纳米通道的运输的基础。
Dead-end micro- and nanoscale channels are ubiquitous in nature and are found in geological and biological systems subject to frequent disruptions. Achieving fluid flows in them is not possible through conventional pressure-driven mechanisms. Here we show that chemically driven convective flows leading to transport in and out of dead-end pores can occur by the phenomenon of transient diffusioosmosis. The advective velocity depends on the presence of an in situ-generated transient ion gradient and the intrinsic charge on the pore wall. The flows can reach speeds of 50 mu m/s and cause extraction of otherwise-trapped materials. Our results illustrate that chemical energy, in the form of a transient salt gradient, can be transduced into mechanical motion with the pore wall acting as the pump. As discussed, the phenomena may underlie observed transport in many geological and biological systems involving tight or dead-end micro- and nanochannels.