Experimental Soft Condensed Matter Group Harvard University, Prof. D. A. Weitz Cool Picture of the Moment

Double emulsions being produced in sol-gel coated PDMS microfluidic device. The devices have been functionalized to have different wetting properties at the different flow-focus junctions. The first drop maker is hydrophilic and produces a fluorocarbon oil in water emulsion. The second drop maker is hydrophobic, allowing emulsification of the water continuous phase of the first drop maker and encapsulation of the oil drops into large water drops, producing an oil-water-oil double emulsion. The size and number of the drops that make up the double emulsions can be controlled by adjusting flow rates.

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