Calculation of Hamaker constant of spherical magnesium hydroxide colloid based on DLVO theory

ZHANG Xian; YE Chunsong; JIA Xuxiang; LIU Tong; HUANG Jianwei

doi:10.19666/j.rlfd.201803058

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Calculation of Hamaker constant of spherical magnesium hydroxide colloid based on DLVO theory

Thermal Power Generation Vol. 47, Issue 12, Pages: 47-52(2018)

更新时间：2025-05-30

- Calculation of Hamaker constant of spherical magnesium hydroxide colloid based on DLVO theory
- 作者机构：
  
  武汉大学动力与机械学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201803058
  CLC： X703;O648.1
- Published：2018
- 稿件说明：
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ZHANG Xian, YE Chunsong, JIA Xuxiang, et al. Calculation of Hamaker constant of spherical magnesium hydroxide colloid based on DLVO theory[J]. Thermal Power Generation2018, 47(12): 47-52.
DOI：

ZHANG Xian, YE Chunsong, JIA Xuxiang, et al. Calculation of Hamaker constant of spherical magnesium hydroxide colloid based on DLVO theory[J]. Thermal Power Generation2018, 47(12): 47-52. DOI： 10.19666/j.rlfd.201803058.

摘要

Hamaker常数是表征带电胶粒间范德华引力的关键参数

对于研究脱硫废水中氢氧化镁胶体的稳定性具有重要意义。本文以DLVO理论为基础

推导了球形氢氧化镁胶体在对称型电解质溶液中Hamaker常数的表达式。结果表明:氢氧化镁胶体的Hamaker常数与表面电位参数v_0、反离子价态z和临界聚沉浓度c_(ccc)有密切联系。采用动态光散射技术研究氢氧化镁胶体的凝聚过程

计算求得氯化钠溶液引起氢氧化镁胶体聚沉的临界聚沉浓度为47.28 mmol/L。结合Gouy-Chapman电位分布方程

推导了表面电位参数v_0的表达式

通过临界聚沉浓度下的_(ccc)电位求得氢氧化镁胶体的表面电位参数为0.357

同时计算出其在氯化钠溶液中的Hamaker常数为7.99×10~(-20) J。

Abstract

The Hamaker constant is a key parameter for characterization of Van der Waals force between charged colloidal particles and is also of significance to studying the stability of magnesium hydroxide in desulfurization wastewater.In this study

the Hamaker constant of spherical magnesium hydroxide colloid in symmetric electrolyte solution was derived based on the DLVO theory.The results show that

the Hamaker constant is closely related to the surface potential parameter v_0

antiionic valence z and critical coagulation concentration c_(ccc )of the spherical magnesium hydroxide colloid.The dynamic light scattering technology was applied to investigate the coagulation process of the magnesium hydroxide

and the critical coagulation concentration c_(ccc) of the sodium chloride solution was calculated as 47.28 mmol/L.Meanwhile

based on the Gouy-Chapman equation of potential distribution

expression of the surface potential parameter v_0 of the magnesium hydroxide was derived

and its calculated value was 0.357.Furthermore

the Hamaker constant of the magnesium hydroxide in sodium chloride solution was calculated as 7.99×10~(-20) J.

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