Colloidal transport phenomena in dynamic, pulsating porous materials.
Colloidal transport phenomena in dynamic, pulsating porous materials.
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动态脉动多孔材料中的胶体传输现象。
DOI：
10.1002/aic.18215
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Takatori,ShoC
中科院分区：
文献类型：
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作者：
Nagella,SachitG;Takatori,ShoC
我们研究嵌入在移动的障碍物阵列中的胶体颗粒的传输现象，该障碍物模仿动态的、时变的多孔材料。虽然已经很好地研究了胶体在一系列静止障碍物(“被动”多孔介质)中的传输，但我们对非平衡多孔环境中的胶体扩散缺乏基本的了解。我们将泰勒色散理论、布朗动力学模拟和光镊子实验相结合，研究示踪胶体粒子在振动障碍物晶格中的传输。我们发现示踪粒子的弥散是振荡频率的非单调函数，并且在没有障碍物的情况下表现出超过斯托克斯-爱因斯坦-萨瑟兰扩散系数的最大值。通过使用广义色散框架求解Smoluchowski方程，我们证明示踪剂的增强传输主要依赖于与障碍物的直接粒子间相互作用以及由移动的障碍物产生的流体介质的流体动力相互作用。
We study the transport phenomena of colloidal particles embedded within a moving array of obstacles that mimics a dynamic, time‐varying porous material. While colloidal transport in an array of stationary obstacles (“passive” porous media) has been well studied, we lack the fundamental understanding of colloidal diffusion in a nonequilibrium porous environment. We combine Taylor dispersion theory, Brownian dynamics simulations, and optical tweezer experiments to study the transport of tracer colloidal particles in an oscillating lattice of obstacles. We discover that the dispersion of tracer particles is a nonmonotonic function of oscillation frequency and exhibits a maximum that exceeds the Stokes–Einstein–Sutherland diffusivity in the absence of obstacles. By solving the Smoluchowski equation using a generalized dispersion framework, we demonstrate that the enhanced transport of the tracers depends critically on both the direct interparticle interactions with the obstacles and the fluid‐mediated, hydrodynamic interactions generated by the moving obstacles.