Figure 1

Experimental radial distribution functions (scatter) for a range of particle area fractions η; see the η values marked on the graph.

The plots are shifted vertically for clarity of representation. The solid curves represent the simulated g(r), obtained (a) by event-driven Brownian dynamics of HDs (b) by molecular dynamics of LJ particles. Note the much better quality of the fits in (b). The insets zoom onto the principal peak of the g(r) for η = 0.19, to emphasize the mismatch between our experimental data (exp) and hard disks (HD) simulations. The mismatch is much smaller for the LJ potentials [section (b)], suggesting that the experimental pair potentials include an attractive component, shown in the following to be resulted by the electric dipoles.