Monte Carlo simulation on ring deposition of nanoparticle-suspended drying liquid droplet

In the present study, a simple Monte Carlo simulation algorithm is developed to simulate the ring like deposition of the nanoparticles contained in a drying liquid droplet, as an effort to provide a solid foundation of the drying process after inkjet printing. The Monte Carlo simulation consists of three independent algorithms: (a) liquid volume reduction due to evaporation at the contact line, (b) convective motion of solid particles to the contact line, and (c) treatment of the solid particles floating in the air. The results show that the solid particles move to the contact line, and the volume of the droplet decreases linearly with time during the drying. This agrees excellently with a general description of the ring deposition of drying liquid droplets suspended with nanoparticles. Some other important features, such as self-pinning of the contact line, reduction of the droplet radius, and pattern formation are also found in this simulation.