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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Structural and microscopic relaxations in a colloidal glass.

Flavio Augusto de Melo Marques¹, Roberta Angelini, Emanuela Zaccarelli

¹Center for Life Nano Science, IIT@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, I-00161 Roma, Italy. flavio.marques@iit.it.

|November 20, 2014

Summary

This study reveals distinct aging dynamics in colloidal glass. Microscopic relaxation is always diffusive, while structural relaxation transitions from diffusive to discontinuous hopping dynamics with aging.

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Area of Science:

Condensed matter physics
Materials science
Soft matter physics

Background:

Colloidal glasses exhibit complex aging dynamics.
Understanding relaxation processes is crucial for materials science.

Purpose of the Study:

To investigate the aging dynamics of colloidal glass across wide time and length scales.
To differentiate between microscopic and structural relaxation processes.

Main Methods:

Multiangle dynamic light scattering
Neutron spin echo
X-ray photon correlation spectroscopy
Molecular dynamics simulations

Main Results:

Microscopic relaxation time is consistently diffusive (scaling as Q(-2)).
Structural relaxation transitions from diffusive (Q(-2)) to discontinuous hopping (Q(-1)) dynamics during aging.
Both relaxation processes show stretched correlation functions.

Conclusions:

The findings provide a comprehensive description of relaxation dynamics in colloidal glasses.
Distinguishes between diffusive and hopping dynamics in aging materials.