Dresden 2009 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Microfluidics I: Applications and Devices
CPP 34.9: Talk
Thursday, March 26, 2009, 11:45–12:00, ZEU 160
Microfluidic Physics of Self-synchronizing Picolitre Droplet Generation — •Venkatachalam Chokkalingam1, Stephan Herminghaus1, and Ralf Seemann1, 2 — 1Max Planck Institute for Dynamics and Self-Organization, Goettingen, Germany. — 2Experimental Physics, Sarland University, Germany.
The in-situ generation of pairs of droplets with excellent monodispersity is essential for quantitative (bio-) chemical reactions in a droplet based microfluidic chip. In the presented work we demonstrate the simultaneous, self-synchronized production of droplets with high dispersed phase volume fraction (up to about 96 %) and excellent monodispersity (variance of the droplet diameter < 1.2 %) with two different contents by step emulsification. The synchronization is achieved by a pressure cross talk of two connected production units while retaining all relevant properties of a single step-emulsification unit. Pairs and triplets of droplets can be achieved. While the drop volumes of the two droplet types may be different up to a factor of two, the excellent monodispersity of each type is retained.