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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Micro and Nanofluidics
CPP 30.12: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster C
Self-Synchronizing Microfludiic Droplets — •Venkatachalam Chokkalingam1,2, Stephan Herminghaus2, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, 66123-Saarbruecken, Germany — 2Max Planck Institute for Dynamics and Self-Organization, Bunsenstr. 10, 37073-Goettingen, Germany
An easy to handle device for the synchronized in-situ production of two types of emulsion droplets in a microfluidic device with high dispersed phase volume fraction (up to about 96 %) and excellent monodispersity (variance of the droplet diameter < 1.2 %) is introduced. For this device we combined two single step-emulsification units into one device whereas the droplet production of each individual unit self synchronizes with the other to produce droplets in a strictly alternating way. This double step-emulsification mechanism is very robust and even allows producing two distinct families of droplets with variable size in a fixed number ratio of 1:1 upto 1:4, with each family having identical droplets while maintaining excellent monodispersity (variance always < 1.2 %).