Ion-linked double-network hydrogel with high toughness and stiffness

Jilong Wang, Junhua Wei, Siheng Su, Jingjing Qiu, Shiren Wang

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


In this paper, a facile one-pot method was developed to fabricate ion cross-linked calcium-alginate/poly(acrylamide) (PAAm) double-network hydrogels with excellent toughness and stiffness. In comparison to the sodium alginate/PAAm hybrid gel, the as-fabricated calcium-alginate/PAAm gel demonstrated superior mechanical properties. After soaking in calcium chloride (CaCl2) solution, the size of the as-synthesized hybrid gel can be well controlled without observable volumetric swelling through manipulating the equilibrium between shrinkable elastic energy from ionic (Ca2+) bonds and swelling osmotic energy. This material design and processing technology are promising to fabricate complicated-shaped cartilage with high geometric fidelity. After soaking in 8 wt% CaCl2 solution for 2 h, compressive strength of calcium-alginate/PAAm gel was significantly improved by 92 % compared to PAAm single network hydrogel, meanwhile the size and shape of calcium-alginate/PAAm gel were nearly changed and deformed, respectively.

Original languageEnglish
Pages (from-to)5458-5465
Number of pages8
JournalJournal of Materials Science
Issue number16
StatePublished - Aug 4 2015


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