Wynter J. Duncanson, Alireza Abbaspourrad, Ho Cheung Shum, Shin-Hyun Kim, Laura Adams and David A. Weitz, "Monodisperse Gas-Filled Microparticles from Reactions in Double Emulsions" Langmuir, Accepted for publication (2012).
We present a strategy for preparing size-controlled gas-filled microparticles using two aqueous components that chemically react to produce the gas. We use a dual-bore microfluidic device to isolate the reactants of two gas-producing reactions until they are encapsulated in the outer droplet. The reactants in the monodisperse droplets merge and produce the gas bubbles, which are stabilized with a surfactant and form the core of the microparticles. The number and size of the generated gas bubbles are governed by the gas-forming reaction used. Our versatile strategy can be applied to a wide range of gas-producing reactions.
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