Effect of Surfactant on the Drying Patterns of Graphite Nanofluid Droplets Alexandru Crivoi Fei Duan 10.1021/jp401751z.s002 https://acs.figshare.com/articles/media/Effect_of_Surfactant_on_the_Drying_Patterns_of_Graphite_Nanofluid_Droplets/2414596 We investigate the effect of surfactant on the formation of nanoparticle aggregates that resulted from evaporation of sessile nanofluid droplets theoretically and experimentally. A Monte Carlo model is developed to explain the transition from the coffee-ring pattern to the uniform deposition in drying the pinned sessile nanofluid droplets. The model applies the diffusion limited cluster–cluster aggregation approach coupled with the biased random walk of nanoparticles. The experiments show that the addition of surfactant in nanofluids helps the formation of a coffee ring instead of the uniform domain coverage. The simulations suggest an explanation of this transition by controlling the sticking probability parameter between the particles. The simulated results statistically agree with the experimental observation of the finally dried graphite nanoparticle structures from the pinned nanofluid droplets. 2013-05-16 00:00:00 sessile nanofluid droplets coffee ring graphite nanoparticle structures Monte Carlo model experiments show surfactant uniform domain coverage nanoparticle aggregates nanofluid droplets Drying Patterns transition Graphite Nanofluid DropletsWe uniform deposition formation probability parameter