Figure 3.

(A) Normalized short-time self-diffusion coefficient, D_self^′ = D_s/D₀, as a function of the volume fraction ϕ. Results for the hard (HE) and attractive (ATT_E) ellipsoids are displayed, together with results for the hard (HS) and attractive (ATT_S) spheres. Ellipsoids show a lower mobility than spheres because of the larger effective hydrodynamic size. Inset: short-time self-diffusion describes the Brownian motion within the cage of neighboring particles. (B) The normalized difference between self-diffusion of ellipsoids and spheres, as obtained from theoretical predictions for hard spheres^43,44 (solid black line in panel A) and polynomial guide-to-the-eyes (dashed lines in panel A).