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Ultra-long-range dynamic correlations in a microscopic model for aging gels.

Pinaki Chaudhuri¹, Ludovic Berthier²

¹The Institute of Mathematical Sciences, C.I.T. Campus, Taramani, Chennai 600 113, India.

Physical Review. E

|July 16, 2017

Summary

Computer simulations reveal anomalous particle dynamics in colloidal gels during aging. These findings, including superdiffusion and large-scale spatial correlations, match experimental observations in soft materials.

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Area of Science:

Soft Matter Physics
Materials Science
Computational Physics

Background:

Colloidal gels exhibit complex aging dynamics.
Understanding these dynamics is crucial for soft material applications.
Kinetically arrested phase separation is a key mechanism in gel formation.

Purpose of the Study:

To explore nonequilibrium aging dynamics in a microscopic model of colloidal gels.
To identify and characterize anomalous particle dynamics during gelation.
To link simulation results to experimental observations in soft materials.

Main Methods:

Large-scale computer simulations.
Microscopic modeling of colloidal gel systems.
Spatiotemporal analysis of particle dynamics.

Main Results:

Gelation involves kinetically arrested phase separation.
Anomalous particle dynamics, including superdiffusion, were observed.
Compressed exponential relaxation of time correlation functions was identified.
Intermittent heterogeneities and large-scale spatial correlations were revealed.

Conclusions:

The developed model accurately reproduces spontaneous aging dynamics in soft materials.
Anomalous dynamics are a hallmark of aging in kinetically arrested colloidal gels.
Microscopic simulations provide valuable insights into macroscopic material behavior.