Such hydrogels may thus absorb up to 1 litre of
water or aqueous solutions per gram of dry material. The
material can be produced in the dry state either in powder
form or as a bulk with a well-defined shape (in this regard, it is
worth noting that the material displays a strong memory of its
shape after swelling). Additionally, the hydrogel can be loaded
with small molecules, for example, nutrients, to be released
in a controlled manner, depending on swelling-deswelling
transitions [