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Identifier

000405330

Title

Yielding and particle rearrangements in hard sphere glasses

Alternative Title

Μηχανισμοί διαρροής και μικροσκοπική δυναμική σε κολλοειδείς υάλους υπό διάτμηση

Author

Jacob, Alan Ranjit

Thesis advisor

Πετεκίδης, Γεώργιος

Reviewer

Φυτάς, Γεώργιος
Βλασσόπουλος, Δημήτριος
Βαμβακάκη, Μαρία
Benoit, Loppinet
Jan, Mewis
Thomas, Voigtmann

Abstract

A very high concentration or volume fraction of colloidal hard spheres (_ >0:58) dispersed in a continuous medium, characterized by the long lived entropic caging of colloidal particles by its neighbours, is termed a colloidal glass. This is a metastable state where the inherent relaxation time of the system deviates to infinity and the study of such systems under flow has garnered immense attention. In this work, we employ rheology and BD simulations to probe the linear and non-linear viscoelastic properties at rest and under shear. We also perform rheological experiments to probe aging as well as non-linear transient behaviour of colloidal glasses. Orthogonal superposition rheometery is utilized to understand the effect of inter particle potential on steady shear of hard sphere and soft colloidal glasses. Furthermore, we verify the presence and investigate different types of glasses existing in asymmetric binary mixtures with the help of BD simulations.

Language

English

Subject

Brownian Dynamics simulations

Colloidal Glass

Rheology

Size Asymmetric Binary Glass

Ασύμμετρος Ύαλος

Γήρανση

Ερπυσμός

Προσομοιώσεις Brownian Δυναμικής

Ταλαντωτική Διάτμηση Υψηλών Συχνοτήτων