| 초록 |
We demonstrate a novel means to fabricate ultrafiltration(UF) membranes using controlled nano-gaps, which are created by selective removal of the shell region of self-assembled organic/inorganic core/shell colloidal particles inside three-dimensional inverse-opal(IO) frames. To achieve strategy, polystyrene/silica core/shell colloidal particles are synthesized, then self-assembled to opal structures by evaporation deposition method. The remaining voids are filled with UV-curable prepolymer and cross-linked by UVirradiation to form inert IO frame. Next, silica shell of the trapped core/shell particles is removed by selective solvent treatment, leading to a formation of nano-gap incorporated opal/IO coexisting structures. Dimensional characteristic of nano-gaps is controlled by varying the ratio between core and shell regions. Finally, resulting structures are utilized for UF membranes for filtration of Au nanoparticles, yielding high permeability and outstanding separation performances |
