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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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Published on: October 24, 2017

Swelling-state-dependent structure of spread microgel monolayers.

T Kratzenberg¹, Y Gerelli², P Gutfreund³

¹Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, Aachen, D-52056, Germany.

Journal of Colloid and Interface Science

|April 14, 2026

Summary

Microgel thermal history dictates interfacial structure, impacting emulsion stability. Understanding this pathway-dependent mechanism is key for designing advanced responsive emulsions and interfacial materials.

Keywords:

Interfacial structure Microgels Neutron reflectometry Stimuli-responsive colloids

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Area of Science:

Materials Science
Surface Chemistry
Colloid Science

Background:

Emulsion breakdown is a critical phenomenon, largely driven by interfacial restructuring.
The precise mechanisms governing microgel behavior at interfaces remain poorly understood, hindering the development of stable emulsions.

Purpose of the Study:

To investigate the interfacial structure of thermo-responsive microgel monolayers.
To understand how thermal history influences microgel architecture and behavior at interfaces.

Main Methods:

Neutron reflectometry was employed to probe the structure of microgel monolayers.
Microgel monolayers were formed both above their volume phase transition temperature and collapsed in situ.

Main Results:

The thermal history of thermo-responsive microgels significantly impacts their monolayer architecture at interfaces.
Particle protrusion into the air phase is critically affected by the microgel's thermal history.

Conclusions:

Microgel interfacial behavior is governed by a pathway-dependent mechanism.
These findings provide fundamental insights for designing next-generation responsive emulsions and interfacial materials.