pmf (r )=-RT ln g (r )-2 RT ln ( r r 0 ) (Equation ) ) The long-range forces and the aggregation between NPs also affect their dynamics in the dispersion, which can be analyzed by the mean square displacement, MSD (Figure ). For the hydrophilic NP (red curves), the MSD increases faster in C8 than in C4, indicating faster dynamics in the former, however, the opposite trend is noticed for the hydrophobic particles (green curves). The major effect for the hydrophilic particles is the aggregation into a single large cluster in the C4 solvent (Figure ), which strongly restricts the NPs motion, while in C8 only a few dimers were formed. On the other hand, for the hydrophobic particles, only dimers and trimers were formed in C4, enabling fast dynamics in this solvent while the solvent-mediated forces is C8 are strong even at large distances, resulting in slow dynamics. All in all, the system with almost no preferential solvent structure that leads to a large cluster and the one with strong solvent structuration, which avoids any clustering, present both very similar MSD and slow NPs dynamics.