Figure 3.

(a) Angell plot for various systems of compressible spheres, symbols (defined in legend): experimental data for hard spheres (a₀ ∼ 130 nm),¹¹ various microgels (a₀ ∼ 90 nm),^13,40 star polymers (a₀ ∼ 20 nm),³⁷ and the globular protein bovine serum albumin (a₀ ∼ 5 nm),⁴¹ drawn lines: predictions from the model as outlined in the text with k̅ as the adjustable parameter. (b) Fragility index m as a function of k̅a₀³ as predicted by the model (line) and for the data sets in (a) (symbols). (c) Intensity correlation functions from dynamic light scattering for uncharged polystyrene microgels with (from left to right) ζ = 0.64, 0.88, 1.02, 1.03, 1.19, 1.25, 1.30, 1.35. (d) Angell plot for compressible colloids of varying charge density: hard spheres,¹¹ weakly charged microgels,^13,40 uncharged microgels from (c), and highly charged microgels,³⁶ drawn lines: predictions from the model.