Different routes into the glass state for soft thermo-sensitive colloids

Area of Science:

• Colloid science
• Soft matter physics
• Materials science

Background:

• Glass formation is crucial for understanding disordered materials.
• Soft colloids present unique challenges in studying glass transitions.
• Controlling particle density and size influences colloidal behavior.

Purpose of the Study:

• To investigate glass formation in soft thermo-sensitive colloids.
• To compare two distinct routes for inducing glass states: density increase vs. radius increase.
• To explore methods for colloidal rejuvenation.

Main Methods:

• Confocal microscopy experiments were used to observe particle dynamics.
• Non-equilibrium self-consistent generalized Langevin equation (NE-SCGLE) theory provided theoretical insights.
• Particle number density and particle radius were systematically varied.

Main Results:

• Both density increase and radius increase routes lead to dynamically comparable glass states over time.
• Persistent, moderate structural differences were observed between the two routes.
• Cyclical changes in particle radius induced a reproducible glass state, demonstrating rejuvenation.

Conclusions:

• The aging dynamics of soft colloidal glasses are comparable across different formation routes.
• Structural details can differ despite similar dynamic behavior.
• Radius cycling presents a viable, shear-free method for colloidal rejuvenation.