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Related Experiment Video

Updated: Jul 5, 2026

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

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Published on: February 11, 2018

Reversed micelle formation in a model liquid-liquid extraction system.

Fuqiang Guo¹, Hongfei Li, Zhifeng Zhang

¹Key Laboratory of Rare Earth on Advanced Materials and Valuable Utilization of Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.

Journal of Colloid and Interface Science

|May 2, 2008

Summary

Cyanex923 self-assembles into reversed micelles in n-heptane, influencing sulfuric acid extraction. The study correlates electrical conductivity and water content with micelle formation and composition.

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Area of Science:

Physical Chemistry
Colloid Science
Solvent Extraction

Background:

Reversed micelles are crucial in solvent extraction systems.
Understanding their formation and role is key to optimizing extraction processes.
Cyanex923 is a common extractant in hydrometallurgy.

Purpose of the Study:

To investigate the formation of reversed micelles in the Cyanex923/n-heptane/H(2)SO(4) system.
To elucidate the roles of the extractant and extracted complexes in micelle formation.
To correlate physicochemical properties with micelle behavior.

Main Methods:

Interfacial tension, electrical conductivity, and water content measurements.
Fourier transform infrared (FTIR) spectroscopy.
Dynamic light scattering (DLS) for micelle size analysis.

Main Results:

Cyanex923 demonstrated a tendency for self-assembly into reversed micelles.
Electrical conductivity exhibited an S-type curve with increasing sulfuric acid concentration.
A correlation was observed between electrical conductivity, water content, and the organic phase composition.
FTIR and DLS confirmed the involvement of Cyanex923 and Cyanex923H(2)SO(4) in micelle formation.

Conclusions:

Cyanex923 forms reversed micelles, influencing sulfuric acid extraction.
The microstructure and composition of the organic phase are dynamic and affected by the extraction process.
Extractant and extracted complexes are integral to the reversed micelle structure.