Micro-particle separation has been applied to various fields such as microfluidics, microbiology, pharmacy, and chemistry for a long time. In this study, we propose a novel technique which can separate di-disperse particles of different densities in a...
Micro-particle separation has been applied to various fields such as microfluidics, microbiology, pharmacy, and chemistry for a long time. In this study, we propose a novel technique which can separate di-disperse particles of different densities in a sessile drop, by using “Coffee Stain Effect” and “Cheerios Effect”. The temperature and contact angle are the major factors which determine the evaporation mode of a drop, so that the experiments are conducted for various wettability conditions with and without heating. As a result, by analyzing the distribution of particles in a dried drop quantitatively, it is revealed that the particles can be separated efficiently at room temperature and small contact angles.