Shape- and orientation-dependent diffusiophoresis of colloidal ellipsoids
Shape- and orientation-dependent diffusiophoresis of colloidal ellipsoids
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DOI：
10.1103/physreve.107.l052602
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发表时间：
2023-05-18
影响因子：
2.4
通讯作者：
Shin, Sangwoo
中科院分区：
文献类型：
--
作者：
Doan, Viet Sang;Kim, Dong-Ook;Shin, Sangwoo
我们提出了由离子溶质梯度引起的椭球粒子的扩散电泳。与一般认为扩散电泳与形状无关的预期相反，我们在实验上证明，当薄德拜层近似放松时，这种扩散会破裂。通过跟踪各种椭球的平移和旋转，我们发现椭球的泳动率对椭球的偏心率和椭球相对于溶质梯度的取向很敏感，并且在强约束下会进一步导致非单调行为。我们表明，这种形状和取向相关的胶体椭球体的扩散电泳可以很容易地捕获通过修改球的理论。
We present the diffusiophoresis of ellipsoidal particles induced by ionic solute gradients. Contrary to the common expectation that diffusiophoresis is shape independent, here we show experimentally that this assump-tion breaks down when the thin Debye layer approximation is relaxed. By tracking the translation and rotation of various ellipsoids, we find that the phoretic mobility of ellipsoids is sensitive to the eccentricity and the orientation of the ellipsoid relative to the imposed solute gradient, and can further lead to nonmonotonic behavior under strong confinement. We show that such a shape-and orientation-dependent diffusiophoresis of colloidal ellipsoids can be easily captured by modifying theories for spheres.