Template‐free synthesis and selective filling of Janus nanocups

We report on the formation of shape‐ and surface‐anisotropic Janus nanocups (JNCs) by evaporation‐induced confinement assembly (EICA) of ABC triblock terpolymers. During microphase separation in spherical confinement, the triblock terpolymer spontaneously adopted a hemi‐spherical shape with an inner concentric lamella‐lamella (ll) morphology. Cross‐linking and disassembly of the microparticles resulted in well‐defined JNCs with different chemistry on the inside and outside. By synthesizing polymers with increasing length of the cross‐linkable block, we tuned the mechanical stability of the nanocups, which is relevant to control opening and closing of the cup cavity. We utilize the Janus prop‐erties for selective uptake of cargo exemplified on filling of JNCs with polymer or gold nanoparticles. The directional properties of JNCs in‐spire applications in locomotion, oil spill recovery, storage & release, templating, and as nanoreactors with attoliter volume.

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