4.7 Article

Tuning Sedimentation Through Surface Charge and Particle Shape

期刊

GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 7, 页码 -

出版社

AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL091251

关键词

clay gels; collapse transition; consolidation; hindered settling; sedimentation; surface charge

资金

  1. ARO [W911-NF-16-1-0290]
  2. American Chemical Society Petroleum Research Fund [61536-ND8]

向作者/读者索取更多资源

The experiments revealed that the sedimentation rate and style of mud are influenced by the surface charge. Classic hindered settling theory can reasonably describe the sedimentation behavior of repulsive clay particles and silica spheres, while attractive clay particles form clay gels that consolidate like a soft solid. Water flow forms fracture-like channels in the gel, highlighting the complex behavior of natural mud sedimentation.
Mud forms the foundation of many coastal and tidal environments. Clay suspensions carried downstream from rivers encounter saline waters, which encourages aggregation and sedimentation by reducing electrostatic repulsion among particles. We perform experiments to examine the effects of surface charge on both the rate and style of sedimentation, using kaolinite particles as a model mud suspension and silica spheres with equivalent hydrodynamic radius as a control. Classic hindered settling theory reasonably describes sedimentation rate for repulsive clay particles and silica spheres, which form a highly concentrated jamming front. The hindered settling description breaks down for attractive clay particles, which aggregate to form clay gels that consolidate like a soft solid. Water flow form fracture-like channels in the bulk of the gel, which disappear as gel enters a creep regime. Results may help toward understanding the effect of surface charge and particle shape on the sedimentation and erodibility of natural mud.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据