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The solvent-accessible surface area (SASA) of the AuNP pairs vs the separation, as calculated from the SMD runs. The small-r terminus was set where the steep inter-AuNP repulsion starts to dominate. The jumps reflect the 1 ns equilibration that occur between every section. The radius of each atom of the hydrophobic regions was extended by 1.4 Å to find the points on a sphere that are exposed to the solvent.
