title: Stabilization of carbon dioxide (CO2) bubbles in micrometer-diameter aqueous droplets and the formation of hollow microparticles.
abstract: We report an approach to stabilize carbon dioxide (CO2) gas bubbles encapsulated in micrometer-diameter aqueous drops when water in the aqueous drops is evaporated. CO2-in-water-in-oil double emulsion drops are generated using microfluidic approaches and evaporation is conducted in the presence of sodium dodecyl sulfate (SDS), poly(vinyl alcohol) (PVA) and/or graphene oxide (GO) particles dispersed in the aqueous phase of the double emulsion drops. We examine the roles of the bubble-to-drop size ratio, PVA and GO concentration in the stabilization of CO2 bubbles upon water evaporation and show that thin-shell particles with encapsulated CO2 bubbles can be obtained under optimized conditions. The developed approach offers a new strategy to study CO2 dissolution and stability on the microscale and the synthesis of novel gas-core microparticles.
authors.affiliation: Microsystems Engineering, Rochester Institute of Technology, Rochester, New York, USA. jdween@rit.edu.
authors.forename: Tianyi
authors.initials: T
authors.lastname: Lu
authors.affiliation: Microsystems Engineering, Rochester Institute of Technology, Rochester, New York, USA. jdween@rit.edu.
authors.forename: Rong
authors.initials: R
authors.lastname: Fan
authors.affiliation: Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA.
authors.forename: Luis F
authors.initials: LF
authors.lastname: Delgadillo
authors.affiliation: Microsystems Engineering, Rochester Institute of Technology, Rochester, New York, USA. jdween@rit.edu.
authors.forename: Jiandi
authors.initials: J
authors.lastname: Wan