Formation of Biphasic Janus Droplets in a Microfabricated Channel for the Synthesis of Shape-Controlled Polymer Microparticles


  • T. Nisisako,

    1. Precision and Intelligence Laboratory, Tokyo Institute of Technology, R2-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503 (Japan)
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  • T. Torii

    1. Department of Human and Engineered Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, #358 Environmental Building, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba 277-8563 (Japan)
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  • This work was partially supported by MEXT (Special Coordination Funds for Promoting Science and Technology, and Grant-in-Aid for Young Scientist (Start-up) No. 18 810 013) and the Ogasawara Foundation for the Promotion of Science & Engineering.


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A microfluidic approach is developed for the synthesis of anisotropic particles based on the flow of two immiscible organic phases, a polymerizable phase and a non-polymerizable phase, in a co-flowing aqueous stream within a microchannel. The anisotropic shape originates from the balancing of the interfacial energies between the three phases. The anisotropic particles shown in the figure are obtained by the photopolymerization of the droplets formed in the channels.