Formation of dispersions using “flow focusing” in microchannels

Anna, Shelley L.; Bontoux, Nathalie; Stone, Howard A.
January 2003
Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p364
Academic Journal
A flow-focusing geometry is integrated into a microfluidic device and used to study drop formation in liquid-liquid systems. A phase diagram illustrating the drop size as a function of flow rates and flow rate ratios of the two liquids includes one regime where drop size is comparable to orifice width and a second regime where drop size is dictated by the diameter of a thin "focused" thread, so drops much smaller than the orifice are formed. Both monodisperse and polydisperse emulsions can be produced.


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