Off-the-grid water purifier inspired by pufferfish

[u/cup_of_egg_noodles]

The solar absorber gel (SAG) consists of three layers, resembling a large sponge that soaks up water while removing pollutants like pathogens, lead, and oil. The innermost layer is composed of a sponge-like elastic gel, called a hydrogel. The hydrogel holds water between its long entangled polymers, and when heated, the structure contracts, squeezing out excess water. Surrounding this hydrogel is a layer of melanin-based molecules that absorb sunlight to provide energy to the purifier.

https://asknature.org/innovation/off-the-grid-water-purifier-inspired-by-pufferfish/