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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
Published on: April 19, 2018
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Glass transition of soft colloids
Adrian-Marie Philippe1, Domenico Truzzolillo1, Julian Galvan-Myoshi2
1Laboratoire Charles Coulomb (L2C), University of Montpellier, CNRS, Montpellier, France.
Physical Review. E
|May 16, 2018
Summary
Soft colloid dynamics differ from hard spheres near the glass transition. Softness impacts dynamics significantly in nonequilibrium regimes, leading to unique relaxation behaviors.
Area of Science:
- Soft matter physics
- Colloid science
- Glassy dynamics
Background:
- Colloidal systems exhibit glassy dynamics near the glass transition.
- Particle softness is a key parameter influencing colloidal behavior.
Purpose of the Study:
- Investigate glassy dynamics in soft colloids (microgels, charged particles).
- Compare dynamics of soft colloids to hard spheres.
- Understand the role of particle softness in equilibrium and nonequilibrium regimes.
Main Methods:
- Experimental studies using microgels and charged particles.
- Computer simulations of colloidal systems.
- Analysis of structural relaxation time (τ_{α}) and time correlation functions.
Main Results:
- Structural relaxation time (τ_{α}) grows steeply with volume fraction in the supercooled regime, similar to hard spheres.
- Particle softness is independent of τ_{α} growth near the glass transition.
- In a novel nonequilibrium regime at high packing fractions, τ_{α} shows weak dependence on density, with compressed exponential decay in correlation functions.
- Anomalous decrease in local order observed with increasing density in ultrasoft systems.
Conclusions:
- Softness becomes crucial in the nonequilibrium regime, leading to stress-driven relaxation.
- Peculiar dynamics arise from aging and refluidization tendencies in soft colloids.
- Findings challenge conventional understanding of glassy dynamics in soft matter.
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