title: Controllable gas/liquid/liquid double emulsions in a dual-coaxial microfluidic device.
abstract: This article presents a simple and novel approach to prepare monodispersed gas-in-oil-in-water (G/O/W) and gas-in-water-in-oil (G/W/O) double-emulsions in the same dual-coaxial microfluidic device. The effects of three phase flow rates on the sizes of microbubbles and droplets and the number of the encapsulated microbubbles were systematically studied. We successfully synthesized two different types of gas/liquid/liquid (G/L/L) double emulsions with different inner structures in the same geometry by adjusting the flow rates sequentially. Mathematical models were developed to predict the size and structures of the double emulsions. This simple approach gives a new idea for preparing hollow and porous microspheres with microbubbles as the direct core/pores templates.
authors.affiliation: The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China. xujianhong@tsinghua.edu.cn
authors.forename: Jian-Hong
authors.initials: JH
authors.lastname: Xu
authors.forename: Ran
authors.initials: R
authors.lastname: Chen
authors.forename: Yun-Dong
authors.initials: YD
authors.lastname: Wang
authors.forename: Guang-Sheng
authors.initials: GS
authors.lastname: Luo
mesh_terms: D004655:Emulsions / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D045423:Microbubbles; D046210:Microfluidic Analytical Techniques; D008863:Microspheres; D009821:Oils / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D004655:Emulsions; D005740:Gases; D009821:Oils; D014867:Water; D019904:Polymethyl Methacrylate