泰勒分散
色散(光学)
带电粒子
静电学
纳米颗粒
材料科学
粒子(生态学)
布朗运动
物理
化学物理
分子物理学
凝聚态物理
纳米技术
光学
扩散
热力学
离子
海洋学
量子力学
地质学
作者
Alexandre Vilquin,Vincent Bertin,Élie Raphaël,David S. Dean,Thomas Salez,Joshua D. McGraw
标识
DOI:10.1103/physrevlett.130.038201
摘要
The dispersive spreading of microscopic particles in shear flows is influenced both by advection and thermal motion. At the nanoscale, interactions between such particles and their confining boundaries become unavoidable. We address the roles of electrostatic repulsion and absorption on the spatial distribution and dispersion of charged nanoparticles in near-surface shear flows, observed under evanescent illumination. The electrostatic repulsion between particles and the lower charged surface is tuned by varying electrolyte concentrations. Particles leaving the field of vision can be neglected from further analysis, such that the experimental ensemble is equivalent to that of Taylor dispersion with absorption. These two ingredients modify the particle distribution, deviating strongly from the Gibbs-Boltzmann one at the nanoscale studied here. The overall effect is to restrain the accessible space available to particles, leading to a striking, ten-fold reduction in the spreading dynamics as compared to the non-interacting case.
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