We successfully synthesized a family ofalginate/polyacrylamide hydrogels using various multivalentcations. These hydrogels exhibit exceptional mechanicalproperties. In particular, we found that the hydrogelscross-linked by trivalent cations are much stronger than thosecross-linked by divalent cations. We demonstrate stretchabilityand toughness of the hydrogels by inflating a hydrogel sheet
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