As stated previously, platinum supported carbon nanoparticles with diameters less than 100 nm are dispersed in solvents with an ionomer to produce catalyst ink. This dispersion is then processed into electrodes which are a few micrometers thick. Due to the mesoscale nature of the system interactions, molecular dynamics is not a computationally viable option to simulate this process. Concurrently, continuum mechanics cannot capture the complex heterogenous agglomeration behaviour observed in the system. However, catalyst particle interactions have been rationalised through the application of the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory . The DLVO theory characterises the stability of catalyst ink dispersions as a function of implicit surface properties of the Pt/C dispersion. Although, the theory underpredicts aggregation kinetics in the presence of depletants, such as ionomers . These shortcomings can be overcome by the application of the 'extended'-DLVO theory to rationalise nanoparticle depletion interactions as a function of ionomer adhesion as presented by Dixit et al .