Abstract
Water surfaces serve as habitats for numerous creatures and have inspired a wide range of innovations. Herein, we demonstrate the fabrication of bag-shaped hanging droplets (dropbags) at the liquid surface using miscible polyelectrolyte aqueous solutions. The surface tension at the liquid-liquid interface maintains the top-opening structure of the dropbag, and the coacervate layer, formed rapidly by electrostatic interactions, inhibits the diffusion of large molecules, providing the dropbag with a flexible shape. Particularly, the "scattered dropbags-in-dropbag" (SDID) system was employed to accelerate the hatching of brine shrimp, such diverse compartmentalized structures and biophilic materials have the potential to be used for the cultivation and research of various creatures.
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