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Here, we uncover a previously unreported \u2018endocytosis\u2019 phenomenon in which an aqueous droplet impacts a deep immiscible pool and spontaneously engulfs the pool liquid, forming a stable double\u2010layered liquid structure. This process origins from the focusing of capillary waves at the droplet\u2010pool interface and followed by a pinch\u2010off of a central oil column via Rayleigh\u2010Plateau instability. We propose a dimensionless criterion for central column formation, determined by whether viscous dissipation of the droplet's kinetic energy. By introducing a UV\u2010crosslinkable precursor, gelatin methacryloyl (GelMA) into the droplet, we succeed in encapsulating pool liquid into hydrogel capsules with tunable core\u2010shell ratios by simply adjusting the impact velocity. This enables precise control of release mechanism: thick\u2010shell capsules exhibit non\u2010Fickian sustained release, while thin\u2010shell capsules display delayed burst Case II release upon swelling. The proposed \u2018endocytosis\u2019 phenomena offer a surfactant\u2010free, single\u2010parameter controlled strategy compared to conventional liquid encapsulation methods, which offers a new opportunity for on\u2010demand release in drug delivery and responsive materials.<\/jats:p>","DOI":"10.1002\/smll.75064","type":"journal-article","created":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T10:58:50Z","timestamp":1786618730000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Capillary\u2010Wave\u2010Induced \u2018Endocytosis\u2019 Enables Programmable Core\u2010Shell Capsules Formation for Controlled Release"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4281-223X","authenticated-orcid":false,"given":"Yi","family":"Huang","sequence":"first","affiliation":[{"name":"National Key Laboratory of Science and Technology on Aero\u2010Engine Aero\u2010Thermodynamics, Research Institute of 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