Figure 2.

(a) Structural relaxation time τ, normalized to the Brownian time scale τ₀, as a function of extrapolated particle packing fraction ζ for (solid lines, top to bottom) k̅ = 20, 10, 5, 3.5, 2, and 1 Pa, with a₀ = 50 nm, using eq 7. Symbols: experimental data for colloidal hard spheres from¹¹ fitted to the VFT equation as described in the text (dotted line). (b) Same data as in (a) in the so-called Angell representation where the packing fraction is normalized to the glass transition ζ_g. (c) Angell plot for theoretical predictions using the harmonic approximation for Π_in (eq 11) for κ = 350, 400, 500, 600, 1000, and 5000 J/m². (d) Angell plot for theoretical predictions using the Flory–Rehner equation-of-state (eq 12) for N_x = 100, 500, 1000, 2000, 3000, and 4000.