title: Ordered complex nanostructures from bimodal self-assemblies of diblock copolymer micelles with solvent annealing.
abstract: We report the formation of ordered complex nanostructures from single-layered films of mixtures of polystyrene-poly(2-vinylpyridine) (PS-P2VP) and polystyrene-poly(4-vinylpyridine) (PS-P4VP) diblock copolymer micelles by THF (tetrahydrofuran) annealing. We first examined the influence of THF vapor on PS-P2VP and PS-P4VP micelles in their single-layered films. Due to the different solubility of PS-P2VP and PS-P4VP copolymers in THF, a hexagonal array of PS-P2VP micelles was changed into cylindrical nanodomains, but that of PS-P4VP micelles was not changed. The different influence of THF on PS-P2VP and PS-P4VP micelles was combined in single-layered films of mixtures of both micelles. For the purpose, we prepared mixture solutions of independently prepared small PS-P2VP and large PS-P4VP micelles. Then, bimodal self-assemblies of micelles were prepared from the mixtures, for which the hexagonal array of large PS-P4VP micelles was surrounded by small PS-P2VP micelles. When the bimodal self-assembly was annealed by THF vapor, PS-P2VP micelles were transformed into cylindrical nanodomains, but their reorganization was guided by hexagonally arranged PS-P4VP micelles. As a result, we were able to produce ordered complex nanostructures in the form of a hexagonal array of PS-P4VP micelles surrounded by PS-P2VP cylinders, which was further utilized for the synthesis of Au nanoparticles.
authors.affiliation: Department of Chemistry, Seoul National University, Seoul, 151-747, Korea.
authors.forename: Seung-Min
authors.initials: SM
authors.lastname: Jeon
authors.forename: Sung Hwa
authors.initials: SH
authors.lastname: Lee
authors.forename: Seong Il
authors.initials: SI
authors.lastname: Yoo
authors.forename: Byeong-Hyeok
authors.initials: BH
authors.lastname: Sohn
mesh_terms: D005663:Furans / Q000737:chemistry*; D008567:Membranes, Artificial; D008823:Micelles; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012995:Solubility; D012997:Solvents / Q000737:chemistry; D013499:Surface Properties
chemical_list: D005663:Furans; D008567:Membranes, Artificial; D008823:Micelles; D011137:Polystyrenes; D011145:Polyvinyls; D011725:Pyridines; D012997:Solvents; C569267:polystyrene-block-poly(2-vinylpyridine); C509607:polystyrene-block-poly(4-vinylpyridine); C018674:tetrahydrofuran