Tuning Polymeric Amphiphilicity via Se–N Interactions: Towards One‐Step Double Emulsion for Highly Selective Enzyme Mimics

: A selenium-containing small molecule is exploited to controllably tune the polymer amphiphilicity, leading to fabrication of appropriate polymer surfactants through which one-step double emulsions can be obtained in a facile, scalable, surfactant-free approach. After solvent evaporation, these resulting porous microparticles are shown to be the exceptional artificial GPx enzyme mimics.