Fig. 6. Snapshot structures of (a) PAHs-L1, (b) PAHs-L0, (c) PAHs-T1, and (d) PAHs-T0 type asphaltene molecular aggregates in the presence of 20 wt% toluene additive. Red lines shows the toluene molecules, grey lines represent the carbon atom skeletons. H atoms are omitted.