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arXiv 1107.4853cond-mat.soft
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电稳定胶体悬浮液的剪切增稠

Shear thickening in Electrically Stabilized Colloidal Suspensions

Joachim Kaldasch, Bernhard Senge, Jozua Laven

摘要:

提出了一种理论的剪切增稠的胶体悬浮液中的颗粒,稳定的静电斥力的发病。基于活化模型的临界剪切应力可以推导出一个恒定的电位和恒定的电荷的方法的球体在稠密的悬浮液中的剪切增稠的开始。与以前的模型不同,考虑了总的相互作用势(吸引力和排斥力之和)。临界剪切应力与总相互作用势的最大值有关,该最大值由每个颗粒的自由体积缩放。与实验研究的比较表明了理论的适用性。

英文摘要:

A theory is presented for the onset of shear thickening in colloidal suspensions of particles, stabilized by an electrostatic repulsion. Based on an activation model a critical shear stress can be derived for the onset of shear thickening in dense suspensions for a constant potential and a constant charge approach of the spheres. Unlike previous models the total interaction potential is taken into account (sum of attraction and repulsion). The critical shear stress is related to the maximum of the total interaction potential scaled by the free volume per particle. A comparison with experimental investigations shows the applicability of the theory.

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