Abstract Particle detachment during colloidal-suspension transport in porous media occurs in chemical and environmental engineering. Breach of the attached particles mechanical equilibrium conditions yields their mobilisation by rolling, sliding, or lifting. We introduced a novel phase diagram indicating the detachment regime for given transport conditions. The phase diagram structure follows from the mechanical equilibrium conditions. Seven series of laboratory tests in visualisation cell with various parameters have been conducted. Placing the observed detachment parameters on phase diagrams shows that rolling is the dominant detachment regime. A gradual detachment of particles was explained by a probabilistic distribution of the particle and surface parameters, and a novel method for the probabilistic distribution determination is developed. For the laboratory tests performed, correlating the critical velocity for particle mobilisation with asperity size allowed obtaining the asperity distribution on the substrate. The obtained distributions were in agreement with reported values of surface roughness on glass coverslips.

中文翻译：

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固体表面的胶体脱离：相图确定脱离状态

摘要 在化学和环境工程中，多孔介质中胶体-悬浮液传输过程中的颗粒脱离发生。破坏附着的颗粒机械平衡条件会导致它们通过滚动、滑动或提升而移动。我们引入了一个新的相图，表明给定运输条件下的分离机制。相图结构遵循机械平衡条件。已经在具有各种参数的可视化单元中进行了七个系列的实验室测试。将观察到的脱离参数放在相图上表明滚动是主要的脱离状态。粒子的逐渐脱离可以通过粒子和表面参数的概率分布来解释，并且开发了一种用于概率分布确定的新方法。对于所进行的实验室测试，将粒子移动的临界速度与凹凸尺寸相关联，可以获得基板上的凹凸分布。获得的分布与报道的玻璃盖玻片表面粗糙度值一致。