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We form water-in-oil droplets in a microfluidic channel-nozzle geometry for studying the influence of viscosity of oil and of different oil classes on the droplet size. We find that the chemical structure of oil dominates over its viscosity. Our studies are done on micropatterned glass chips which provide high thermal and chemical stability.
Christoph Merten, Leonie Kolmar, Xiaoli Ma, Hongxing Hu