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Identifier 000366659
http://elocus.lib.uoc.gr
Title A study on the effects of interparticle interactions on the dynamics, rheology and aging of colloidal systems out of equilibrium
Alternative Title Μελέτη της επίδρασης των διαμοριακών αλληλεπιδράσεων στη δυναμική, τη ρεολογία και τη γήρανση κολλοειδών συστημάτων εκτός ισορροπίας
Author Κουμάκης, Νικόλαος Ν
Thesis advisor Πετεκίδης, Γεώργιος
Abstract The phase behavior of a suspension of monodisperse colloidal hard spheres is determined solely by its volume fraction, φ. At low concentrations we find a liquid state and at higher concentrations it forms an ordered crystal as a way to maximize entropy. At a transition volume fraction of about 0.59 the system becomes kinetically trapped in a metastable glassy state. Addition of a high concentration non-adsorbing linear polymer depletant causes attractions between the particles, inducing microstructurally heterogeneous frozen gel states at intermediate volume fractions and attractive glasses at high φ’s. Under non-linear shear, solid-like suspensions of hard spheres, either glasses, crystals or gels, yield and flow, the stress response to the applied strain reflecting the microstructural changes and microscopic particle motions. This study focuses on the linear and the non-linear properties under shear (transient and steady state), both microscopic and rheological, of solid-like colloidal suspensions, encompassing the hard sphere glasses, shear induced crystals, attractive glass and gels states. To this end, we use rheology, Brownian Dynamics simulations, along with the light scattering Echo technique.
Language English
Subject Brownian dynamics simulation
Colloids
Crystals
Gels
Glasses
Hard spheres
Yielding
Διαρροή
Κολλοειδή
Κρύσταλλοι
Πηκτώματα
Προσομοιώσεις δυναμικής Brown
Σκληρές σφαίρες
Υαλοι
Issue date 2011-02-01
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses
  Type of Work--Doctoral theses
Permanent Link https://elocus.lib.uoc.gr//dlib/c/5/b/metadata-dlib-e13ba3817b112a43afafb6a9d2a2fa08_1307430484.tkl Bookmark and Share
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