循环剪切胶体悬浮液中的平移和旋转不可逆性
Translational and rotational irreversibility in cyclically sheared colloidal suspensions
- Georgetown University（乔治城大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本研究通过共聚焦流变仪追踪循环剪切胶体悬浮液中颗粒的三维轨迹与旋转，发现不可逆状态下的流动诱导各向异性由颗粒间摩擦和互锁机制决定，促进混合并维持旋转各向同性。
中文摘要 AI 辅助
我们研究了在广泛的颗粒浓度范围内循环剪切悬浮液的平移和旋转动力学。利用定制的共聚焦流变仪和化学性质相同但表面光滑或有凸起的胶体颗粒，研究了向不可逆状态的转变。在三维空间中追踪颗粒轨迹和旋转，揭示了增强的有效扩散率，其表现出依赖于颗粒浓度和颗粒形态的流动诱导各向异性。我们表明，在不可逆状态下，剪切诱导的各向异性由颗粒间摩擦和互锁机制决定，这些机制促进混合并强制实现旋转各向同性。
英文摘要
We investigate the translational and rotational dynamics of cyclically sheared suspensions over a broad range of particle concentrations. The transition to an irreversible state is studied using a custom confocal-rheometer and colloidal particles synthesized with chemically identical smooth and lobed surfaces. The particle trajectories and rotations are tracked in three dimensions to reveal enhanced effective diffusivities that exhibit flow induced anisotropy that depends on particle concentration and particle morphology. We show that within the irreversible state, the shear induced anisotropy is determined by interparticle friction and interlocking mechanisms that promote mixing and enforce rotational isotropy.
