Facile Fabrication of Hybrid Colloidosomes with Alginate Gel Cores and Shells of Porous CaCO3 Microparticles

Come together: Porous CaCO3 microparticles self-assemble to form shells at the interfaces of water-in-oil emulsion droplets. Water cores containing alginate are subsequently gelated in situ by Ca2+, which is released from the CaCO3 microparticles when the pH value is lowered. As the picture shows, the CaCO3 microparticle shell of the hydrogel bead can be seen under polarized light.