Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 76: Organic, Polymeric, Biomolecular Films - also with Adsorbates

O 76.5: Talk

Thursday, February 28, 2008, 16:15–16:30, MA 043

Selective polymerization on laser patterned organic templates: Towards switchable surface structures — Mareike Mathieu, Alexander Friebe, Steffen Franzka, Mathias Ulbricht, and •Nils Hartmann — Fachbereich Chemie and Center for Nanointegration Duisburg-Essen (CeNIDE), Universität Duisburg-Essen (UDE), 45141 Essen, Germany

Stimuli responsive polymeric hydrogels provide a means to build up membranes with switchable pore structures [1]. Here we present results from experiments which aim at the fabrication of hydrogel nanostructures on planar surfaces. Native silicon wafers were coated with octadecylsiloxane monolayers and patterned following a photothermal procedure. In conjunction with postfunctionalization routines hydroxyl-terminated organic surface structures with a lateral dimension down to 100 nm and below have been prepared [2], and those were used to introduce initiator sites for heterogeneous graft copolymerization. Temperature-responsive poly(N-isopropylacrylamide) (PNIPAAm) was then grafted onto these structures via surface-initiated atom transfer radical polymerization (ATRP). The thickness and structure of the polymer coating were characterized using atomic force microscopy (AFM). Work in progress also addresses the temperature responsive properties of these polymer structures.

1. A. Friebe, M. Ulbricht, Langmuir 23 (2007) 10316.

2. D. Dahlhaus, S. Franzka, E. Hasselbrink, N. Hartmann, Nano Letters 6 (2006) 2358.