Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: POSTERS Micro- and Nanofluidics
CPP 22.4: Poster
Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A
Molecular Electronics using Gel-Emulsions — •Shashi Thutupalli1, Venkatachalam Chokkalingam1, Marcel Mayor3, Stephan Herminghaus1, and Ralf Seemann1,2 — 1Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 2Experimental Physics, Saarland University, Saarbrücken, Germany — 3Department of Chemistry, University of Basel, Switzerland
We use `gel emulsions' (emulsion with a very small continuous phase volume fraction) that arrange into a foam like topology for well defined assembly of molecules across the droplet lamellae. For certain water in oil emulsions including suitable surfactants, the lamella separating the droplets can be collapsed to form a double-layer membrane by controlling the volume fraction of the continuous phase. A hydrophobic conducting molecule might then insert into the membrane with its hydrophilic head groups immersed into the droplets while the orientation of the molecule is well known. The water droplets sandwiching these molecules can then serve as electrodes to apply a voltage across the membrane via the molecules. When the gel-emulsion flows along a network of microfluidic channels we can induce precise rearrangements of the foam like droplet topology. Thus, we expect to build various electronic circuits. As a first approach towards this, water droplets in dodecane, with monoolein as surfactant, are produced. A voltage sensitive fluorescent dye (eg. Di-4-Anepps) is inserted in the membrane and switching of the fluorescent peak is demonstrated.