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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Quantifying the Fragility-Elasticity Relationship in Uncharged Ultrasmall Polymeric Colloids.

Yihui Zhu¹, Yan Gao¹, Juanjuan Gao¹

¹State Key Laboratory of Advanced Fiber Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.

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|January 5, 2026

Summary

Soft colloidal glasses show varying fragility based on particle properties. Smaller or softer particles exhibit strong glass behavior, while larger or stiffer ones show fragile transitions, creating a dynamic phase diagram.

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Area of Science:

Soft matter physics
Colloidal science
Vitrification physics

Background:

Soft colloidal glasses are crucial in daily life and for understanding vitrification.
Dynamic fragility in these glasses varies significantly with concentration.
The interplay of particle softness (cross-linking, charge) and fragility is complex and not fully understood.

Purpose of the Study:

To systematically investigate the relationship between particle properties and dynamic fragility in soft colloidal glasses.
To quantify how concentration, diameter, and elasticity influence relaxation times and fragility.
To establish design principles for colloidal suspensions based on fundamental physics.

Main Methods:

Studied 16 uncharged polystyrene soft nanoparticles (SNPs) with controlled diameter and elasticity.
Quantified relaxation time as a function of concentration, diameter, and cross-linking density.
Determined fragility by correlating relaxation time with elastic energy per particle.

Main Results:

Identified a threshold elastic energy dictating glass behavior.
Particles with lower elastic energy (smaller/softer) showed strong glass behavior.
Particles with higher elastic energy (larger/stiffer) exhibited fragile glass transitions via cooperative relaxation.

Conclusions:

Established a dynamic phase diagram predicting fragility transitions in soft colloidal glasses.
Resolved existing contradictions regarding factors influencing glass fragility.
Provided design principles for tuning colloidal suspension properties.