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Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

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Glassy-Rubbery Transition-Induced Geometry-Dependent Swelling in Gels.

Zhaoyu Ding¹, Peihan Lyu¹, Zechao Jiang¹

¹School of Physics, Beihang University, Beijing 100191, China.

ACS Macro Letters

|February 26, 2026

Summary

This summary is machine-generated.

Gel swelling is geometry-dependent. Shape controls swelling speed in glassy polymer gels by mechanical confinement, not diffusion, offering new design principles for soft robotic and biomedical applications.

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Area of Science:

Polymer Science
Materials Science
Soft Matter Physics

Background:

Gel swelling is crucial for applications in biomedical, sensing, and soft robotics.
The influence of gel geometry on swelling dynamics is not well understood.
Traditional models often overlook geometric effects on diffusion processes.

Purpose of the Study:

To investigate the impact of geometry on the swelling dynamics of glassy polymer gels.
To introduce a new length scale governing geometry-dependent swelling.
To elucidate the underlying physical mechanism regulating swelling in different shapes.

Main Methods:

Development of a three-dimensional computational model for arbitrary gel geometries.
Analysis of swelling kinetics in various shapes including disks, spheres, and cylinders.
Investigation of the role of the glassy-rubbery transition in mechanical confinement.

Main Results:

Swelling rates are inherently geometry-dependent, with disks swelling fastest and spheres slowest.
A new geometric length scale (Λ) is identified, complementing the classical diffusion length (L).
Geometry regulates swelling via mechanical confinement from a glassy core, not altered solvent diffusion.

Conclusions:

Gel swelling in glassy polymer systems is fundamentally controlled by geometry.
Mechanical confinement during the glassy-rubbery transition is the key regulatory mechanism.
This work provides a new physical design principle for optimizing gel-based systems through shape control.