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Particle size-dependent Marangoni vortex phenomenon in the evaporating droplet system
Changdeok Seo(서창덕),Daeho Jang(장대호),Jongjin Chae(채종진),Sehyun Shin(신세현) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Dissolving surfactant in water causes a vortex flow near droplet edge and leads to uniform patterns of colloidal particle deposition after evaporation. Radially-outward capillary flow and radially-inward Marangoni flow drive this vortex flow. Recently, Still, T. et al discovered that the motions of particles are affected by initial concentrations of surfactant (Sodium dodecyl sulfate). In this paper, we observed that particle behaviors are also affected by the particle size. 3 different sizes of PS (polystyrene) particle samples had different behavior in a fixed initial concentration of surfactant (SDS) solution. 3㎛ particles rotated slowly and 1μm particles rotated quickly. However 5㎛ particles were not rotating. Therefore, we suggest that not only the initial concentration but also the suspended particle size should be considered an important factor of the vortex flow phenomenon. In addition, the behaviors of particles in an evaporating droplet system could be controlled by adjusting the initial concentration of surfactant and the particle size.