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The Colloidal State

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Giant pH-responsive microgel colloidosomes: preparation, interaction dynamics and stability.

Andrew J Morse¹, Emma C Giakoumatos, Sin-Ying Tan

¹Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, South Yorkshire S3 7HF, UK.

|December 10, 2015

Summary

Stable microgel colloidosomes were formed by reacting poly(tert-butylamino)ethyl methacrylate (PTBAEMA) microgels with a cross-linker at the oil-water interface. This reaction prevented droplet coalescence, forming robust structures dependent on interfacial adsorption kinetics.

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Area of Science:

Materials Science
Colloid and Surface Chemistry
Polymer Science

Background:

Cationic poly(tert-butylamino)ethyl methacrylate (PTBAEMA) microgels are utilized in Pickering emulsions.
Understanding microgel particle interactions at oil-water interfaces is crucial for emulsion stability.

Purpose of the Study:

To investigate the formation and stability of microgel-stabilized oil droplets and colloidosomes.
To explore the role of an oil-soluble cross-linker in preventing coalescence.

Main Methods:

High-speed video camera monitoring of oil droplet interactions.
Interfacial tension, elasticity, and viscosity measurements.
Oscillatory dynamics assessment of coalescing droplet pairs.

Main Results:

PTBAEMA microgel adsorption alone did not prevent droplet coalescence.
Addition of tolylene 2,4-diisocyanate-terminated poly(propylene glycol) (PPG-TDI) cross-linker enabled formation of stable microgel colloidosomes.
Colloidosome stability was influenced by interfacial adsorption kinetics of both microgels and PPG-TDI.
Acid-induced transitions did not destabilize pre-formed colloidosomes.

Conclusions:

Surface-initiated cross-linking is essential for creating stable microgel colloidosomes.
The kinetics of cross-linker and microgel adsorption dictate colloidosome formation and stability.
Pre-formed microgel colloidosomes exhibit remarkable stability against acid-induced destabilization.