Shear-induced configurations of confined colloidal suspensions.
Shear-induced configurations of confined colloidal suspensions.
复制标题
受限胶体悬浮液的剪切诱导构型。
DOI：
10.1103/physrevlett.93.046001
复制
发表时间：
2004
影响因子：
8.6
通讯作者：
D. Weitz
中科院分区：
文献类型：
--
作者：
I. Cohen;T. Mason;D. Weitz
我们发现几何约束显著地影响了稠密单分散胶体悬浮液的剪切诱导构型；出现了一种新的结构，其中粒子层屈曲堆积在更有效的堆积中。剪切带中的体积分数由粘性应力和未剪切颗粒的接触库的渗透压力之间的平衡控制。我们提出了一个模型，该模型解释了我们的观察结果，并有助于阐明受限悬浮液中颗粒堆积和剪应力之间的复杂相互作用。
We show that geometric confinement dramatically affects the shear-induced configurations of dense monodisperse colloidal suspensions; a new structure emerges, where layers of particles buckle to stack in a more efficient packing. The volume fraction in the shear zone is controlled by a balance between the viscous stresses and the osmotic pressure of a contacting reservoir of unsheared particles. We present a model that accounts for our observations and helps elucidate the complex interplay between particle packing and shear stress for confined suspensions.