Although those models do not intend to reproduce exactly any realistic NP, the hydrophilic one will present a behavior similar to a hydroxylated ceramic NP, while the hydrophobic NP will behave as expected by a NP with the surface covered by CH 3 groups. Only electrically neutral NPs will be discussed here, with the effect of a net charge on the NPs being more suitable for future work since it is expected to add additional complexity to the problem. In the next section, the major results will be presented and discussed, starting with a discussion regarding the thermodynamics for the association between 2 NPs in both ILs and how the solvent organization around the NPs can induce activation barriers for aggregation. After that, the behavior of the NPs in dispersions with high concentrations in the same ILs will be discussed, showing how the detailed results obtained for the association between a pair of NPs can be used to understand the collective behavior in systems with many NPs inducing organization in the solvent and interacting with each other.