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Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Updated: Jan 28, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Cryogenic wormlike micelles.

Hongyao Yin¹, Yujun Feng, Peixun Li

¹Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, P. R. China. yjfeng@scu.edu.cn.

|March 7, 2019

Summary

This summary is machine-generated.

Researchers created cryogenic wormlike micellar solutions using a zwitterionic surfactant in an ethylene glycol/water mixture. These fluids maintain viscoelastic properties at subfreezing temperatures for specialized applications.

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Area of Science:

Materials Science
Physical Chemistry
Colloid Science

Background:

Wormlike micellar solutions exhibit unique viscoelastic properties.
Maintaining these properties at subfreezing temperatures is challenging.
Novel surfactant systems are needed for low-temperature applications.

Purpose of the Study:

To fabricate cryogenic wormlike micellar solutions.
To investigate the self-assembly of a specific zwitterionic surfactant at subzero temperatures.
To assess the rheological properties of these solutions at subfreezing conditions.

Main Methods:

Self-assembly of erucyl dimethyl amidopropyl betaine (a C22-tailed monounsaturated zwitterionic surfactant).
Use of an ethylene glycol/water co-solvent system.
Rheological property measurements at subzero temperatures.

Main Results:

Successful fabrication of cryogenic wormlike micellar solutions.
Solutions exhibited a freezing point significantly below 0 °C.
Retained viscoelastic properties comparable to ordinary wormlike micellar solutions.

Conclusions:

Cryogenic wormlike micellar solutions can be formed from zwitterionic surfactants in glycol/water mixtures.
These fluids maintain desirable rheological characteristics at subfreezing temperatures.
Potential applications exist in areas requiring viscoelasticity at subfreezing conditions, such as specialized industrial fluids or cryoprotectants.