IMSA-SIR Exploring Cooperative Rearrangement Regions and Dynamical Heterogeneities in Colloidal Suspension with Combined XPCS and in-situ rheology at Argonne

Internship Description

Project Abstract
This proposed research aims to experimentally investigate the origin of cooperative dynamics (Co-Dyn) in condensed colloidal suspensions. Co-Dyn is a collective motion of particles toward external perturbation and, thus, we hypothesize the timing, lifetime, and intensity of its appearance are connected to the shear history of the entire system and interparticle force between individual particles. A series of silica suspensions with different interparticle interactions and deformation procedures will be investigated with Combined XPCS and in-situ rheology (Rheo-XPCS) to verify this hypothesis. Detailed and time-resolved structural and dynamical information of these colloidal suspensions under shear is gathered. The particle-scale motions are quantitatively correlated to the response of larger-scale systems. The experimental results will be visualized to the tangible physical picture through molecular dynamics simulations and interpreted within the framework of established theories in statistics and stochastic processes, enabling accurate descriptions and even predictions of Co-Dyn.

Education and Experience Requirements

The experimental results will be visualized to the tangible physical picture through molecular dynamics simulations and interpreted within the framework of established theories in statistics and stochastic processes, enabling accurate descriptions and even predictions of Co-Dyn.

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