Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 24: POSTER Microfluidics

CPP 24.10: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Structured Micro- and Nanotubes for Microfluidic and Nanoprinting applications. — •Valerij Luchnikov and Manfred Stamm — Institut für Polymersforschung e.V. Dresden, Hohe Str. 6, 01069 Dresden

Tubes and pores of micro- and nanoscale dimensions find numerous applications in separation science, biotechnology, microfluidics, sensors. However possibilities of engineering tube-based devices are strongly limited by hard access to inner walls of the mesotubes. We surmount this problem by formation of tubes via rolling-up of strained bilayers released in controllable manner from a solid substrate [1]. In our fabrication scheme bending moment arises in the bilayer film, composed ot two chemically distinct polymers due to swelling of the bottom component of the bifilm upon immersion it in a selective solvent [2]. (For example, poly(4-vinyl pyridine)/polystyrole bilayer rolls up in acidic water due to swelling of P4VP). Before rolling, the bilayer can be exposed to variety of planar methods of surface modification, such as micro-contact printing, photolithography, plasma activation, magnetron metal sputtering, and others. Geometrically complex patterns (e.g. intermittent hydrophilic/hydrophobic regions) can be created atop of bilayer lithographically and then form patterned interiour of the tubes upon rolling. This opens new broad opportunities for design of mesotube-based devices and basic research.

[1] V.Ya. Prinz et.al. Physica E 2000, 6, 828

[2] V.A. Luchnikov, O. Sydorenko, M. Stamm, Adv. Mater. 2005, 17, 1177