Related Experiment Video
Updated: Sep 11, 2025
06:31
Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
Published on: March 18, 2020
6.4K
Synergistic Predrying and Surfactant Strategy for Enhanced Dispersion Stability of Magnesium Hydroxide Particles in
Cailing Chu1, Fei Tan1, Jingyu Wang1
1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100, P. R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 14, 2025
Summary
Preadsorbed water on magnesium hydroxide (Mg(OH)2) particles hinders dispersion in kerosene, causing aggregation. Predrying particles and using surfactants creates stable, low-viscosity suspensions for radioactive waste treatment.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Dispersion of magnesium hydroxide (Mg(OH)2) particles in kerosene is vital for radioactive organic liquid waste treatment.
- Preadsorbed water on Mg(OH)2 surfaces impedes effective dispersion in kerosene.
Purpose of the Study:
- To investigate the impact of preadsorbed water on Mg(OH)2 particle dispersion stability and rheology in kerosene.
- To understand the role of capillary forces and surfactant effectiveness in the presence of adsorbed water.
Main Methods:
- Correlating preadsorbed water content with suspension microstructure and rheology.
- Evaluating the effect of a surfactant (polyoxyethylene alkyl ether carboxylic acid, CE10Ac) on dispersion.
- Implementing a synergistic approach of particle predrying and surfactant modification.
Main Results:
- Preadsorbed water induces strong capillary attractions, leading to particle aggregation and high suspension modulus (92 kPa).
- Even with CE10Ac surfactant, capillary forces dominate, maintaining a high storage modulus (1.8 kPa).
- Predrying and surfactant modification eliminate capillary forces, enabling steric and solvation stabilization for low-viscosity (<40 mPa·s) suspensions.
Conclusions:
- Capillary forces from adsorbed water are a major challenge for Mg(OH)2 dispersion in kerosene.
- A combined predrying and surfactant modification strategy effectively overcomes these challenges.
- This approach provides a practical method for preparing stable suspensions for radioactive waste treatment.
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