| 초록 |
Ouzo effect is well-known for surfactant-free stable emulsion formation. We have demonstrated the successful formation of stable emulsion in the mixture of oxidants such as FeCl3·6H2O, acetone as solvent, and toluene as anti-solvent, characterized by dynamic light scattering. Due to excess ammount of anti-solvent, the formed emulsion droplets are largely composed of solvent and oxidant with small amount of anti-solvent because of mutual miscivility between solvent and anti-solvent. Upon the addition of EDOT monomer into the Ouzo emulsion of oxidant, polymerization reaction strats from the outer boundary of individual emulsion droplets, leading to the formaion of hollow shpere of conductive polymer, PEDOT. Depending on sphere size and shell thickness, the hollow sphere has collapsed into nano-bowl, due to mechanical stress. This hollow sphere to nano-bowl transition has been analyzed by mechanical modeling. Also, it could be successfully controlled for the generation of sphere or nano-bowl, by varying various parameters such as concentrations of constituents. |
