Janus droplet microreactors for preparing polyaniline/AgCl nanocomposites†

We report a novel method to conduct heterogeneous reactions using aqueous-ionic liquid Janus microdroplets as a series of isolated bi-phasic microreactors where AgCl@polyaniline core–shell nanoparticles are successfully synthesized accompanied by polyaniline nano-needles, and enhanced visualization of reaction progression through the color changes in Janus droplets is achieved.