Monodisperse Double Emulsions Generated from a Microcapillary Device

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When you mix two immiscible liquids, you get a dispersion of droplets of one liquid inside the other. This is defined as an emulsion. Double emulsions are dispersions of a third liquid inside the droplets of the first emulsion. Thus we have three liquid: the inner, the middle, and the outer. Double emulsions have a high potential for applicability within the commercial field, because the middle liquid shields the inner liquid from the outer and so allows for effective encapsulation and separation. However, controlled creation of double emulsions has been difficult to achieve. This paper reports a new method that controls both the size and the number of double emulsion droplets through a microcapillary technique.