Video microscopy and Monte Carlo simulation of sedimented colloids

In collaboration with the Weeks group in the Emory Physics Department, we are studying the ordering transition of monolayers of colloidal silica particles settled from aqueous suspension onto a glass surface.  Starting over the summer of 2017, Yijun Dong (Emory College, class of 2018) and Peiyao Wu (Emory College, class of 2020) have been working towards measuring how large (and heavy) these particles need to be to settle into a hexagonally ordered monolayer.

The image below epitomizes the collaboration – the circles represent particles imaged in Yijun’s experiments, while the color coding (where intensity of color represents degree of local hexagonal ordering and hue represents its orientation) comes from an analysis performed by Peiyao on her simulations.