|341. Yuan, J.; Lu, Y.; Schacher, F.H.; Lunkenbein, T.; Weiß, S.; Schmalz, H.; Müller, A.H.E.: Template-Directed Synthesis of Hybrid Titania Nanowires within Core-Shell Bishydrophilic Cylindrical Polymer Brushes, Chem. Mater. 21, 4146 (2009) -- DOI: 10.1021/cm900032m|
Well-defined core-shell bishydrophilic cylindrical polymer brushes (CPBs) with a poly(2-hydroxyethyl methacrylate) (PHEMA) core and a poly(oligo(ethylene glycol) methacrylate) (POEGMA) shell were synthesized via the combination of anionic polymerization and atom transfer radical polymerization. They were used as a unimolecular cylindrical template for the controlled fabrication of linear assemblies of titania nanoparticles. The titania precursors were found localized mainly in the brush core via a transalcoholysis reaction and partially in the shell via a weak complexation force. After hydrolysis, the obtained titania-CPB hybrid nanowires are amorphous and soluble in organic solvents as well as water. A phase transition from amorphous titania to anatase titania was found by refluxing the hybrid nanowire solution for 5 days in a mixture of water/dioxane (vol. ratio = 1/3). They could also serve as in situ template for the pyrolytic formation of inorganic crystalline titania nanowires at 550 °C.
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- Projekt: DFG MU896/22: Templatgestützte Synthese von anorganischen Nanodrähten in amphiphilen, zylindrischen Kern-Schale-Polymerbürsten