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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 68: Crystallization, Nucleation and Self-Assembly I

CPP 68.2: Talk

Thursday, March 15, 2018, 12:00–12:15, C 230

Structure Formation in Drying Colloidal Droplets — •Jiarul Midya and Arash Nikoubashman — Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany

The stratification dynamics of a polydisperse colloidal dispersion in a spherical droplet is investigated during its evaporation via molecular dynamics simulation. Here, our primary focus lies on the structure formation of the dispersed particles during the evaporation process. As the solvent evaporates, the particle concentration inside the droplet increases. Depending on the evaporation rate and the particle size ratios (characterized through the Peclet number), we observe the formation of a dense layer of smaller particles at the receding vapor-liquid interface, whereas the core of the droplet contains a mixture of both small and large particles. When the solvent is completely evaporated from the droplet a colloidal superparticle is formed, which can be porous, amorphous or crystalline, depending on material properties and evaporation rate.