The microcapsules were prepared using a microfluidic three-way Lego-inspired device a closed box while the capsules were collected in a glass vial, the irradiation was performed during 5 min during the collection. The capsules were collected in a glass vial, transferred into a 15 ml centrifugation flask, centrifuged at 4000 rpm (Centrifuge Z 306, Hermle Labortechnik GmbH), and resuspended in water. This process was repeated three times to remove PVA. Then, the capsules were left in a 1:1 isopropanol-water mixture, which was exchanged two times to cleave off the TMS groups from the polymer network and to remove toluene, yielding PHEA-l-PDMS APCNs with a 50:50 wt% composition of PHEA and PDMS, in analogy to the synthesis of PHEA-l-PDMS APCN films in our previous publications. Some APCN capsules were further stained with Nile Red. To this end, 20 µL of the capsule suspension was added to 1 µL of 1 mM Nile Red in a vial and mixed it in a vortex mixer for 90 s.