利用双聚焦荧光互相关直接测量疏水滑移
Direct measurements of hydrophobic slippage using double-focus fluorescence cross-correlation
摘要：
我们报告的结果直接测量的速度分布在微通道中的疏水性和亲水性的墙壁，使用一种新的高精度的方法，双焦点空间荧光互相关在共聚焦显微镜下。在两个壁的附近，通过给出恒定速度的平台，测得的速度分布不会变为零。这种明显的滑移被证明是由于泰勒分散，增强的剪切扩散的纳米示踪剂在流动方向。比较各种条件下疏水壁和亲水壁附近的速度分布表明，由于疏水性，存在真实的滑移长度。这个长度，几十纳米的数量级，是独立的电解质浓度和剪切速率。
英文摘要：
We report results of direct measurements of velocity profiles in a microchannel with hydrophobic and hydrophilic walls, using a new high precision method of double-focus spacial fluorescence cross-correlation under a confocal microscope. In the vicinity of both walls the measured velocity profiles do not turn to zero by giving a plateau of constant velocity. This apparent slip is proven to be due to a Taylor dispersion, an augmented by shear diffusion of nanotracers in the direction of flow. Comparing the velocity profiles near the hydrophobic and hydrophilic walls for various conditions shows that there is a true slip length due to hydrophobicity. This length, of the order of several tens of nanometers, is independent on electrolyte concentration and shear rate.
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