| 초록 |
The drying of particle-laden sessile drops was investigated experimentally. Depending on the size of particles, the viscosity of fluid and the wettability of solid surface, the drying pattern varied and there was a competition of the inward movement due to the surface force between the particles trapped in the air-liquid interface and the outward movement due to the Deegan flow. In water, the typical ‘coffee ring’ of colloidal particles was not always observed and spherical particles larger than 10μm in diameter moved toward the center. In xanthan gum or polyethylene oxide solutions, either inward or outward motion was observed depending on the low shear viscosity. |
