Fig. 2 Emulsion interfacial polymerization mechanism for producing Janus particles. Emulsion interfacial polymerization mechanism for producing Janus particles.

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Fig. 2 Emulsion interfacial polymerization mechanism for producing Janus particles. Emulsion interfacial polymerization mechanism for producing Janus particles. (A) Schematic of the fabrication of Janus particles. The initial polymerization of hydrophobic monomers inside the droplet could produce a particle nucleus that moved toward the oil/water interface. In this case, the hydrophilic anchoring monomers in the external water phase could contact the particle nucleus and be initiated to polymerize, thereby anchoring the particle at the interface of the droplet, triggering interfacial anchoring polymerization. Subsequently, based on the equal chemical potential principle at equilibrium, preferential copolymerization of AA, St, and DVB occurred along the interface in two directions, resulting in the formation of crescent moon–shaped Janus particles. (B) Bright-field microscope images of the time-dependent growth process of Janus particles. Scale bar, 5 μm. (C) Fluorescence microscope images of the time-dependent growth process of Janus particles. Scale bar, 5 μm. (D) Computer simulation results. A dissipative dynamic simulation model combined with a stochastic reaction model was constructed to investigate the dynamic behavior during the interfacial polymerization. The yellow bead represents the St and DVB, whereas the blue sticks represent the polymerized AA monomers. Here, the AA anchoring monomers in the aqueous phase are not shown for clarity. The simulation consistently suggested preferential growth along two directions at the interface, which led to the formation of Janus particles similar to those obtained in the experiment. Jun-Bing Fan et al. Sci Adv 2017;3:e1603203 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).