论文标题
纳米颗粒泰勒分散剂在带有开放边界的充电表面附近
Nanoparticle Taylor dispersion near charged surfaces with an open boundary
论文作者
论文摘要
剪切流中显微镜颗粒的色散扩散受到对流和热运动的影响。在纳米级，这种粒子及其狭窄边界之间的相互作用变得不可避免。我们讨论了静电排斥和吸收在近地面剪切流中带电纳米颗粒的空间分布和分散的作用，在evanevencent的照明下观察到。颗粒和下电荷表面之间的静电排斥通过不同的电解质浓度调节。离开视野的颗粒可以从进一步的分析中忽略，因此实验合奏等效于吸收的泰勒分散体。这两种成分修改了颗粒分布，从这里研究的纳米级的Gibbs-Boltzmann强烈偏离。总体效果是限制颗粒可用的可访问空间，从而导致与非交互情况相比，扩散动力学的惊人，降低了十倍。
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.
