| 초록 |
Herein, we report a new collapse mechanism of colloidal particle monolayers at an air/water interface, which is indicated by the formation of large-area freestanding particle multilayers. Previously, researchers reported several distinctive collapse mechanisms of the particle monolayers by adjusting the surface wettability of particles or by utilizing specialized particles, but the controllable formation of large-area free-standing particle multilayers has not been reported yet. To achieve this successfully, we here selected a highly hydrophilic particle to facilitate the escape of particles from the interface while we applied an attractive interaction between the interface and the particle by dissolving hydrophilic polymers (PEG) in water to effectively prevent particle being lost in water. Furthermore, we also show that the area and thickness of multilayers can be easily controlled by changing a compressional distance or by changing the concentration of PEG in the water |
