锁-键微流控：模拟向列胶体沿波壁通道的平流运动
Lock-Key Microfluidics: Simulating Nematic Colloid Advection along Wavy-Walled Channels
AI总结：
该研究针对向列胶体在微流控复杂通道中动力学模拟的难题，构建了二维波壁通道内流动涨落向列流体中胶体平流的模型，揭示了锚定类型、振幅对锁-键效应的调控规律，为胶体操控提供了新思路。
摘要：
液晶介质可介导悬浮颗粒与受限几何结构之间的相互作用，这不仅有望引导图案化和自下而上的胶体组装，还能控制微流控器件中的胶体迁移。然而，模拟此类动力学过程颇具挑战，因为必须在复杂边界内同时考虑向列弹性、扩散性和流体动力学相互作用。我们对受限在二维波浪形通道内、处于流动且涨落的向列流体中分散的胶体的平流运动进行了建模。研究发现，由于胶体关联缺陷的相对位置不同，胶体与波谷之间的锁-键机制在平面锚定条件下比垂直锚定条件下更强。足够大的振幅会导致粘滑轨迹，甚至使胶体永久锁定在原位。这些结果表明，波壁不仅有望将胶体引导至特定停靠位点，还能控制位点特异性停留时长和间歇洗脱。
英文摘要：
Liquid crystalline media mediate interactions between suspended particles and confining geometries, which not only has potential to guide patterning and bottom-up colloidal assembly, but can also control colloidal migration in microfluidic devices. However, simulating such dynamics is challenging because nemato-elasticity, diffusivity and hydrodynamic interactions must all be accounted for within complex boundaries. We model the advection of colloids dispersed in flowing and fluctuating nematic fluids confined within 2D wavy channels. A lock-key mechanism between colloids and troughs is found to be stronger for planar anchoring compared to homeotropic anchoring due to the relative location of the colloid-associated defects. Sufficiently large amplitudes result in stick-slip trajectories and even permanent locking of colloids in place. These results demonstrate that wavy walls not only have potential to direct colloids to specific docking sites but also to control site-specific resting duration and intermittent elution.
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