Yossifon Gilad, Chang Hsueh-Chia
Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology, Technion City 32000, Israel.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 Jun;81(6 Pt 2):066317. doi: 10.1103/PhysRevE.81.066317. Epub 2010 Jun 29.
Nanocolloids trapped at the depleted side (anodic) of a fluidic nanoslot entrance are shown to sensitively regulate dc ion transport through the nanoslot, such that a second limiting-overlimiting transition occurs in its nonlinear current-voltage characteristics. The nanocolloids, brought to the entrance by electro-osmosis, are not stationary but are confined to closed circular and toroidal streamlines, driven by a back-pressure corner vortex and an orthogonal electroconvection vortex instability. The transition from the corner vortex to a complex torus with both vortical motions coincides with the first overlimiting transition, while electrostatic interaction of nanocolloids in these vortices with the nanoslot entrance drives the second limiting transition.
被困在流体纳米槽入口耗尽侧（阳极）的纳米胶体被证明能灵敏地调节通过纳米槽的直流离子传输，从而使其非线性电流 - 电压特性中出现第二次极限 - 过极限转变。通过电渗作用被带到入口的纳米胶体并非静止不动，而是局限于封闭的圆形和环形流线中，由背压角涡和正交电对流涡旋不稳定性驱动。从角涡到具有两种涡旋运动的复杂环面的转变与第一次过极限转变同时发生，而这些涡旋中的纳米胶体与纳米槽入口的静电相互作用驱动了第二次极限转变。
