Controllable Microfluidic Production of Microbubbles in Water‐in‐Oil Emulsions and the Formation of Porous Microparticles

Water-encapsulated microbubbles (gas-in-water-in-oil) are fabricated using two different microfluidic approaches. By adjusting the flow rate ratio of water to oil the number of encapsulated microbubbles in micrometer-size water droplets and the thickness of the water layer can be controlled. Adding photopolymerizable monomers into the water phase permits polymerization of the aqueous droplets encapsulating the microbubbles yielding porous polymer microparticles. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200800628_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.