Hydrogels? Many people use these substances without knowing it. As superabsorbents in nappies, for example, hydrogels absorb a lot of liquid. In the process, the initially dry material becomes Jelly-like, but it does not wet. Some people place the swellable material on their eyeballs - soft contact lenses are also just hydrogels. The same goes for jelly and other everyday materials.
Hydrogels also play a role in science. From a chemical point of view, they are long, three-dimensionally cross-linked polymer molecules that form cavities. Inside, they can absorb and hold water molecules. ...
