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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Micro and Nanofluidics

CPP 30.11: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Optimized Droplet Microfluidics for Complex Sol-Gel Reactions — •VENKATACHALAM CHOKKALINGAM^{1, 2}, BORIS WEIDENHOF³, WILHELM MAIER³, STEPHAN HERMINGHAUS², and RALF SEEMANN^{1, 2} — ¹Experimental Physics, Saarland University, 66123-Saarbruecken, Germany — ²Max Planck Institute for Dynamics and Self-Organization, Bunsenstr. 10, 37073-Goettingen, Germany — ³Technical Chemistry Saarland University, 66123-Saarbrücken, Germany

Droplet based microfluidics is used to produce silica particles using a sol-gel synthesis route. The chemicals are stoichiometrically dispensed, mixed, and pre-processed inside a microfluidic device allowing for long operation times without any clogging. Using this approach and optimizing all reaction and processing parameters we generate mesoporous silica particles with a very high surface area of 820 sq.m/g and a narrow pore radius distribution of around 2.4 nm. The sol-gel process developed here for pure silica spheres can easily be modified to produce a large variety of mixed oxides.