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Side view of a droplet on hydrogel bilayer, or a membrane formed at a water-hydrogel interface in an oil medium. Here a hydrogel layer and a water droplet are submerged in a lipid-dispersed oil solution and the amphiphilic molecules self-assemble at the oil-hydrogel and at the oil-water interfaces forming monolayers. Placing the aqueous droplet on the hydrogel surface enables membrane formation.
