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Surface charge distribution and its impact on interactions between sediment particles

机译：表面电荷分布及其对沉积物颗粒间相互作用的影响

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摘要

Surface charge distribution has great impact on interactions between sediment particles, which is essential for flocculation studies. In this paper, the micro-morphology and surface charge distribution of quartz sand are measured using the electrical force microscope. Then, the statistical relationship between micro-morphology and surface charge distribution is obtained. Results show that quartz sand possesses a complex surface morphology, which has great impact on the charge distribution. Positive and negative charges mostly concentrate in the saddle, convex, and concave parts of the surface, while their distribution is less in the groove, ridge, and flat parts. A fitting equation between surface charge and non-spherical curvature is also obtained. The surface charge distribution on a mathematical sediment particle is then reproduced according to these relations, and the effect of charge heterogeneity on interactions between different particles is quantified and analyzed, indicating that surface charge distribution has a dramatic effect on interactions between sediment particles, and local surface potential is more important than the average surface potential. This study provides a new method for understanding the processes of flocculation in coastal and estuarine zones.
机译：表面电荷分布对沉积物颗粒之间的相互作用有很大影响，这对于絮凝研究至关重要。本文利用电力显微镜测量了石英砂的微观形貌和表面电荷分布。然后，获得了微观形貌与表面电荷分布之间的统计关系。结果表明，石英砂具有复杂的表面形貌，对电荷分布有很大的影响。正电荷和负电荷主要集中在表面的鞍形，凸形和凹形部分，而在槽，脊和平坦部分中的分布较少。还获得了表面电荷与非球面曲率之间的拟合方程。然后根据这些关系重现数学沉积物颗粒上的表面电荷分布，并对电荷异质性对不同颗粒之间的相互作用的影响进行定量和分析，表明表面电荷分布对沉积物颗粒与局部颗粒之间的相互作用具有显着影响表面电势比平均表面电势更重要。这项研究为了解沿海和河口地区的絮凝过程提供了一种新方法。

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  • 来源
    《Ocean Dynamics》 |2013年第10期|1113-1121|共9页
  • 作者

    Ming-hong Chen; Hong-wei Fang; Lei Huang;

  • 作者单位

    College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;

    Department of Hydraulic Engineering, the State Key Laboratory of Hydro-science and Engineering, Tsinghua University, Beijing 100084, China;

    Department of Hydraulic Engineering, the State Key Laboratory of Hydro-science and Engineering, Tsinghua University, Beijing 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sediment particles; Surface charge; Micro-morphology; Interactions;

    机译：沉积物颗粒;表面电荷;微观形态互动互动;

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