PHEA-l-PDMS microcapsules were prepared in a Lego®-inspired microfluidic double emulsion device and were loaded with platinum nanoparticles (PtNPs) as active catalysts during their microfluidic preparation. Inspired by the swelling and deswelling of pollen grains in response to various hydration levels, the ability of capsules to recover after having been dried and rehydrated was studied.