Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 24: POSTER Microfluidics

CPP 24.8: Poster

Donnerstag, 30. März 2006, 17:00–19:00, P2

Monodisperse Emulsions Confined in Channels — •Enkhtuul Surenjav, Magdalena Ulmeanu, Craig Priest, Dmytro Melenevsky, Stephan Herminghaus, and Ralf Seemann — MPI for Dynamics and Self-Organization, Bunsenstr. 10, D-37073 Göttingen, Germany

Emulsion droplets with diameter in between 2 and 20 microns provide suitable compartments for very small quantities of solvents or reagents. We present a comparative study of several techniques for the preparation of monodisperse emulsions. For some preparation techniques, the continuous phase of the emulsion has to be reduced subsequent to the preparation. It exhibits a variety of transitions in its topology upon interaction with an externally provided geometric constraint or applied field. This is demonstrated, e.g., using an organic ferrofluid as continuous phase and an inhomogeneous applied magnetic field. Furthermore, we study the formation of 2D and 3D emulsion crystals by mixing droplets with two distinct diameters with a certain size ratio, which may lead to a novel type of chemical reaction setup and new materials.