Nanofluidics in the debye layer at hydrophilic and hydrophobic surfaces
Nanofluidics in the debye layer at hydrophilic and hydrophobic surfaces
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DOI：
10.1103/physrevlett.101.114503
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发表时间：
2008-09-12
影响因子：
8.6
通讯作者：
Bocquet, L.
中科院分区：
文献类型：
--
作者：
Bouzigues, C. I.;Tabeling, P.;Bocquet, L.
利用倏逝波研究了亲水和疏水表面德拜层液固界面的平衡和动力学性质。在压力驱动和电渗透流动中，我们测量了距离壁面20至300 nm之间的速度分布、纳米示踪剂浓度和扩散分布。我们提取静电和ζ电位，并以10纳米的精度确定流体动力滑移长度。由流体动力滑移引起的zeta势的惊人放大使我们第一次澄清了zeta势的动力起源。
By using evanescent waves, we study equilibrium and dynamical properties of liquid-solid interfaces in the Debye layer for hydrophilic and hydrophobic surfaces. We measure velocity profiles and nanotracer concentration and diffusion profiles between 20 and 300 nm from the walls in pressure-driven and electro-osmotic flows. We extract electrostatic and zeta potentials and determine hydrodynamic slip lengths with 10 nm accuracy. The spectacular amplification of the zeta potential resulting from hydrodynamic slippage allows us to clarify for the first time the dynamic origin of the zeta potential.