Mono-disperse ferrofluids clusterization: a Monte Carlo study

In this work, we report preliminary results for Monte Carlo simulations of mono-disperse Fe3O4 based nanoparticles. For the low concentration colloids considered in our calculation, we observed only the formation of dimers, with a mean particle-particle distance around 0.5 nm for a 9 nm sample, in excellent agreement with magnetic resonance data. However, our calculated dimer concentration does not change with the particle size in disagreement with experimental finds. This is probably related to the fact that the Hamaker constant is considered size independent.