Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Interfaces and Thin Films I
CPP 3.9: Vortrag
Montag, 14. März 2011, 12:30–12:45, ZEU 160
Surface templated orientation of α-helical poly(L-lysine)/polyanion complexes on unidirectionally texturised substrates — •Martin Müller1, Wuye Ouyang2, Thomas Keller3, and Klaus Jandt3 — 1Leibniz Institute of Polymer Research (IPF) Dresden — 2Unilever, Shanghai, P.R. China — 3Institute of Materials Science and Technology (IMT) , University Jena
Oriented polyelectrolyte complex layers of stiff α-helical poly(L-lysine) (PLL) and poly(styrenesulfonate) (PSS) or poly(vinylsulfate) (PVS) were deposited on either unidirectionally mechanically scratched silicon substrates (i) or thin unidirectionally melt-drawn (md) poly(ethylene) (PE) films (ii) applying the layer-by-layer concept. Based on ATR-FTIR dichroism of the Amide I/II band and SFM image analysis averaged cone opening angles γ of bundled α-PLL rods in the range γ = 12∘ - 35∘ for both substrate types were found, from which high in-plane orientation was concluded. On the mechanically texturised Si substrates (i) fibrous rod-like deposits were aligned along the scratching direction and the orientation showed a significant molecular weight effect of PLL and of PSS, which can be interpreted by a topographical confinement effect of nanoscopic surface grooves on PLL/polyanion rods. Whereas, on the md-PE films (ii) fibrous rod-like deposits were aligned normal to the drawing direction, which can be interpreted by a templating effect of oriented lamellae and regular amorphous/crystalline patterns. Applications of such oriented PEL complex structures are enantiospecific surfaces for the separation of chiral drugs as well as templates for directed cell growth.