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首页> 外文期刊>Physical Review X >Particle-Level Visualization of Hydrodynamic and Frictional Couplings in Dense Suspensions of Spherical Colloids
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Particle-Level Visualization of Hydrodynamic and Frictional Couplings in Dense Suspensions of Spherical Colloids

机译：球形胶体致密悬浮液中流体动力学和摩擦联轴器的粒度可视化

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摘要

The rotational Brownian motion of colloidal spheres in dense suspensions reflects local hydrodynamics and contact forces, which are both key to nonlinear rheological phenomena such as shear-thickening and jamming, and transport in crowded environments, including intracellular migration and blood flow. To fully elucidate the role of rotational dynamics experimentally, it is crucial to measure the translational and rotational motion of all spheres simultaneously. Here, we directly access hydrodynamic and frictional coupling in colloidal suspensions up to arbitrarily high volume fractions using compositionally uniform colloidal spheres with an off-center, fully embedded core. We reveal interparticle hydrodynamic rotation-rotation coupling in charged colloidal crystals. We also find that higher local crystallinity in denser hard-sphere crystalline sediments enhances rotational diffusivity and that nearly arrested particles exhibit a stick-slip rotational motion due to frictional coupling. Our findings shed new light on the largely unexplored, local rotational dynamics of spherical particles in dense particulate materials.
机译：胶体球体以致密悬浮液中的旋转布朗运动反映了局部流体动力学和接触力，这是非线性流变现象的关键，如剪切增厚和干扰，以及拥挤的环境中的运输，包括细胞内迁移和血流。为了在实验上完全阐明旋转动力学的作用，对于测量所有球体的平移和旋转运动同时至关重要。在这里，我们使用具有偏离中心的组成均匀的胶体球，直接进入胶体悬浮液中的流体动力和摩擦耦合，以任意大容量级分，具有偏心，完全嵌入的芯。我们揭示了带电胶体晶体中的晶体流体动力旋转旋转耦合。我们还发现更高的局部局部结晶度在密集的硬球晶体沉积物中提高了旋转扩散性，并且几乎被捕的颗粒由于摩擦耦合而表现出粘滑旋转运动。我们的调查结果在致密颗粒材料中致致球形颗粒的主要透明，局部旋转动态的新发现。

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