Curvature induces and enhances transport of spinning colloids through narrow channels

Eric Cereceda-López, Marco De Corato, Ignacio Pagonabarraga, Fanlong Meng, Pietro Tierno, Antonio Ortiz-Ambriz
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Abstract

The effect of curvature and how it induces and enhances the transport of colloidal particles driven through narrow channels represent an unexplored research avenue. Here we combine experiments and simulations to investigate the dynamics of magnetically driven colloidal particles confined through a narrow, circular channel. We use an external precessing magnetic field to induce a net torque and spin the particles at a defined angular velocity. Due to the spinning, the particle propulsion emerges from the different hydrodynamic coupling with the inner and outer walls and strongly depends on the curvature. The experimental findings are combined with finite element numerical simulations that predict a positive rotation translation coupling in the mobility matrix. Further, we explore the collective transport of many particles across the curved geometry, making an experimental realization of a driven single file system. With our finding, we elucidate the effect of curvature on the transport of microscopic particles which could be important to understand the complex, yet rich, dynamics of particle systems driven through curved microfluidic channels.
曲率诱导并增强旋转胶体在狭窄通道中的传输
曲率效应及其如何诱导和增强胶体颗粒在狭窄通道中的传输是一个尚未探索的研究领域。在这里,我们结合实验和模拟来研究磁驱动胶体粒子在狭窄圆形通道中的动力学。我们使用外部预处理磁场来诱导净转矩,并以确定的角速度旋转粒子。实验结果与有限元数值模拟相结合,预测了流动矩阵中的正旋转平移耦合。此外,我们还探索了许多粒子穿越弯曲几何体的集体传输,在实验中实现了驱动单文件系统。我们的发现阐明了曲率对微观粒子输运的影响,这对理解通过弯曲微流体通道驱动的粒子系统复杂而丰富的动力学非常重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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