title: Structure formation in metal complex/polymer hybrid nanomaterials prepared by miniemulsion.
abstract: Polymer/complex hybrid nanostructures were prepared using a variety of hydrophobic metal β-diketonato complexes. The mechanism of structure formation was investigated by electron paramagnetic resonance (EPR) spectroscopy and small-angle X-ray scattering (SAXS) in the liquid phase. Structure formation is attributed to an interaction between free coordination sites of metal β-diketonato complexes and coordinating anionic surfactants. Lamellar structures are already present in the miniemulsion. By subsequent polymerization the lamellae can be embedded in a great variety of different polymeric matrices. The morphology of the lamellar structures, as elucidated by transmission electron microscopy (TEM), can be controlled by the choice of anionic surfactant. Using sodium alkylsulfates and sodium dodecylphosphate, "nano-onions" are formed, while sodium carboxylates lead to "kebab-like" structures. The composition of the hybrid nanostructures can be described as bilayer lamellae, embedded in a polymeric matrix. The metal complexes are separated by surfactant molecules which are arranged tail-to-tail; by increasing the carbon chain length of the surfactant the layer distance of the structured nanomaterial can be adjusted between 2 and 5 nm.
authors: Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors: Christoph P
authors: CP
authors: Hauser
authors: Nicole
authors: N
authors: Jagielski
authors: Jeannine
authors: J
authors: Heller
authors: Dariush
authors: D
authors: Hinderberger
authors: Hans W
authors: HW
authors: Spiess
authors: Ingo
authors: I
authors: Lieberwirth
authors: Clemens K
authors: CK
authors: Weiss
authors: Katharina
authors: K
authors: Landfester