Polyurea Microcapsules In Microfluidics: Surfactant Control Of Smooth Membranes

Interfacial polymerization strategies provide a versatile route for microcapsule synthesis. We designed a microfluidic course of to synthesize monodisperse polyurea microcapsules (PUMCs); the microcapsules are formed by an interfacial polymerization of isocyanate dissolved in the oil and an amine dissolved in water. We measure the mechanical properties of the capsule in addition to transport properties through the membrane using two microfluidic methods. We present that the elasticity and the permeability of the shell are controlled by surfactant additives, added in the course of the synthesis. The control of the nanostructure of the shell by surfactants gives new means to design encapsulation programs with tailor-made mechanical and physicochemical properties.

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