Diffusion mechanism for highly compressed microgel particles.

It is argued that Voronoi tessellation theory can be used to model the observed diffusion of microgel particles in a highly compressed microgel colloid. It is shown that this model is able to account for the fact that even when the microgel colloid is highly compressed, the particles can diffuse, while the diffusion rate decreases as the degree of compression of the microgel colloid increases, as observed.