Optical images of dissolution of capsules with compositions highlighted in the figure showing (A-C) instantaneous, (D-E) sustained, pulsed and diffuse release. (F) High magnification images of the surface cracks of the capsule and (G) the emanating micron-sized nanoparticle clusters. (H) The droplet radius of the composite (D) capsule was found to remain approximately constant over time, and release of micron-sized nanoparticle clusters occurs in bursts, over long timescales, tuneable with pH. Copyright: Authors, taken without changes from 10.1126/sciadv.aao3353 which has been published under Creative Commons Licence CC BY 4.0 (https://creativecommons.org/licenses/by/4.0).
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