| 초록 |
The drying of a polymer-colloidal film is important in many areas, such as in printing, spreading and coating. An important problem is the structure of dried film is largely dependent on drying conditions. In case of two different size of colloidal mixtures, it is well known that the colloids often stratify, where small colloids are laid upon large colloids at the very strong evaporation condition. Also, the similar polymer-on-top stratification of polymer-colloid mixtures, where the size of polymer is much smaller than the size of colloid, has been reported by simulation. However, there have been no experimental studies for the polymer-colloid mixtures yet. Here, we show that the stratification phenomenon can be controlled by modulating the time scale of solidification at the drying interfaces in experimental study. From rheological measurement, we find the evidence of solidification at the drying interfaces which is originated from polymer, not colloidal particles. |
