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Reentrant phase transition in pH-responsive microgel suspensions.

Sathyavani S¹, R G Joshi¹, Vignesh A^1,2

¹Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India.

The Journal of Chemical Physics

|July 9, 2026

Summary

This summary is machine-generated.

We discovered a unique reentrant phase transition in pH-responsive poly(N-isopropyl acrylamide)-co-poly(acrylic acid) [PNIPAM-co-PAac] microgel suspensions. This transition involves fluid-to-crystal-to-fluid changes with increasing pH, impacting viscoelastic properties.

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Area of Science:

Colloid and Surface Science
Polymer Science
Materials Science

Background:

Microgel suspensions exhibit complex phase behaviors influenced by environmental stimuli.
Understanding pH-responsive materials is crucial for developing advanced functional systems.

Purpose of the Study:

To experimentally investigate the reentrant phase transition in poly(N-isopropyl acrylamide)-co-poly(acrylic acid) [PNIPAM-co-PAac] microgel suspensions.
To elucidate the underlying mechanisms driving the observed reentrant behavior and its effect on viscoelastic properties.

Main Methods:

Utilized pH-titration experiments to induce and observe phase transitions in PNIPAM-co-PAac microgel suspensions.
Characterized structural changes and viscoelastic properties in response to varying pH levels.

Main Results:

Demonstrated a reentrant fluid-to-crystal-to-fluid phase transition in PNIPAM-co-PAac microgel suspensions with increasing pH.
Observed corresponding reentrant viscoelastic properties, transitioning from liquid-like to solid-like and back to liquid-like states.
Explained the reentrant behavior through changes in microgel volume fraction and interparticle electrostatic interactions.

Conclusions:

The study provides experimental evidence for reentrant phase transitions in pH-responsive microgel suspensions.
Reentrant structural changes directly influence the viscoelasticity of these systems.
Findings contribute to the understanding of colloidal phase behavior and stimuli-responsive materials.