Finally, our studies could be extended to include the kinetics of wetting, spreading, and detachment. The fluids in our DPD models have well-defined viscosities, and so in principle one ought to be able to investigate these dynamical aspects with the current models. In our flat, structureless wall model though, the wall potential gives rise to forces on the DPD beads which are normal to the surface, and thus there are no lateral forces. As it stands therefore, there is nothing to stop the bulk DPD fluid from sliding freely over the wall, which would appear to be completely frictionless. To remove this 'feature', one could introduce lateral wall friction forces along the lines of the interparticle dissipative forces between DPD particles, with a corresponding fluctuating wall force to satisfy the fluctuation-dissipation theorem. With this, one can hope to be able to control and adjust the hydrodynamic slip length at the wall, without perturbing the equilibrium structural features such as the surface energies and the contact angle. The movement of the contact line in such models would additionally need to be characterised, and related to the mesoscopic physics of the real system that the model was attempting to emulate. into the appropriate component of the pressure tensor.