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Updated: Jun 19, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Shear-induced phase separation in polyelectrolyte/mixed micelle coacervates.

Matthew W Liberatore¹, Nicholas B Wyatt, Mikayla Henry

¹Department of Chemical Engineering, Colorado School of Mines, Golden, Colorado 80004, USA. mliberat@mines.edu

Langmuir : the ACS Journal of Surfaces and Colloids

|October 27, 2009

Summary

Shear flow induces phase separation in polycation/anionic-nonionic micelle coacervates, forming micrometer-scale droplets. This phenomenon is dependent on temperature and shear rate, leading to observable changes in fluid properties.

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Area of Science:

Materials Science
Physical Chemistry
Polymer Science

Background:

Coacervates are complex fluids formed by phase separation.
Understanding their behavior under shear is crucial for applications.

Purpose of the Study:

To quantitatively study shear-induced phase separation in polycation/anionic-nonionic micelle coacervates.
To elucidate the mechanisms and conditions leading to phase separation under flow.

Main Methods:

Simultaneous rheology and small-angle light scattering (SALS) measurements.
Investigation of three coacervate solutions across varying temperatures and shear rates.

Main Results:

Coacervates are clear Newtonian fluids below 18°C.
Phase separation occurs above critical temperatures/shear rates, evidenced by SALS.
Shear thinning and formation of circular to ellipsoidal droplets (1-4 µm) are observed.

Conclusions:

Shear flow extends polyelectrolyte chains, promoting interpolyelectrolyte-micelle interactions.
This interaction drives ion expulsion and the formation of phase-separated droplets.
The study provides a conceptual model for shear-induced coacervate phase separation.