Impact of DC Electric Field Direction on Sedimentation Behavior of Colloidal Particles in Water.

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2025-03-18 DOI:10.3390/ma18061335

Hiroshi Kimura

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引用次数: 0

Abstract

Colloidal particles in water exhibit increased sedimentation velocity under a horizontal DC electric field of several V/mm compared to no field. Hollow particles with a lower density than water show an increased ascent velocity with the horizontal electric field. These phenomena suggest that colloidal particles form flocs due to the electric field, known as the Electrically Induced Rapid Separation (ERS) effect. This study investigates, for the first time, the impact of the DC electric field direction on the ERS effect. The electric field was defined as horizontal when the inclination angle θ = 0° and vertical at θ = 90°, covering all inclination angles. Results showed that the ERS effect increased for θ < ~20-30° in both upward and downward directions. However, beyond this range, the ERS effect decreased or disappeared. At larger θ values, convection was observed, significantly improving colloidal particle dispersion stability. Additionally, negatively charged particles were observed to be "repelled" near the negative electrode. This study offers new insights into controlling particle dispersion stability using electric fields and suggests potential applications in colloid and material science.

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直流电场方向对水中胶体颗粒沉降行为的影响

与无电场相比，在几V/mm的水平直流电场下，水中胶体颗粒的沉降速度增加。密度小于水的空心颗粒在水平电场作用下上升速度增大。这些现象表明，胶体颗粒形成絮凝由于电场，称为电诱导快速分离（ERS）效应。本研究首次探讨了直流电场方向对电激效应的影响。定义电场在倾角θ = 0°时为水平电场，θ = 90°时为垂直电场，覆盖所有倾角。结果表明，当θ < ~20 ~ 30°时，电激电效应在上下方向均有所增强。但超过这个范围，ERS效应减弱或消失。在较大的θ值下，观察到对流，显著提高了胶体颗粒的分散稳定性。此外，观察到带负电的粒子在负极附近被“排斥”。该研究为利用电场控制粒子分散稳定性提供了新的见解，并在胶体和材料科学中提出了潜在的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.