Morphological changes from silica tubules to hollow spheres controlled by the intermolecular interactions within block copolymer micelle templates.
The morphological changes from tubules to large hollow spheres to (micelle-sized) small hollow-spherical silica were realized by polystyrene-block-poly(vinylpyridine) (PS-b-PVP) block copolymer micelle templates by controlling the intermolecular interactions with the corona chains. PS-b-PVP with weak intermolecular interactions among PVP corona chains yields the coexistence of tubules, large hollow spheres, and small hollow spheres. The coexistence of the three phases arises from the direct aggregation of block copolymer micelles during hydrolytic condensation of a silica precursor (tetraethylorthosilicate), as evidenced by transmission electron microscopy. When the degree of intermolecular interactions within the PVP corona blocks is increased by a change in either the degree of quaternization of the PVP blocks or the dielectric constant of the medium, small hollow spherical silica, with size equivalent to the block copolymer micelles, were solely obtained. We believe that this morphological change is due to the fact that the dipole-dipole interactions among quaternized PVP blocks physically cross-link the PVP coronas in micelles resisting the curvature change during the silica condensation.
Lee
Hyemin
H
School of Chemical and Biological Engineering, Interdisciplinary Program in Nano-Science & Technology, and Center for Functional Polymer Thin Films, Seoul National University, San 56-1, Shilim-dong, Kwanak-gu, Seoul 151-744, Korea.
Char
Kookheon
K
D003460:Crystallization / Q000379:methods; D008422:Materials Testing; D008823:Micelles; D008968:Molecular Conformation; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011137:Polystyrenes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
D008823:Micelles; D011137:Polystyrenes; D012822:Silicon Dioxide