期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 23, 页码 21184-21193出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b05652
关键词
supramolecular organohydrogel; antifreezing; high strength; thermoplasticity; noncovalent interactions
资金
- Excellent Young Scientists Fund by National Natural Science Foundation of China [31722022]
- National Nature Science Foundation of China [51573127, 51733006, 31870948]
- National Key Research and Development Program of China [2018YFC1105502]
Hydrogels based on supramolecular non-covalent interactions have attracted great research interest but are still limited by relatively low mechanical strength and performance deterioration at subzero temperatures because of the formation of ice crystallization. In this study, an antifreezing and mechanically strong gelatin supramolecular organohydrogel is prepared via a simple strategy of immersing a gelatin pre-hydrogel in the citrate (Cit) water/glycerol mixture solution. In the organohydrogel, a part of water molecules are replaced by glycerol, which inhibits the formation of ice crystallization even at extremely low temperature. In addition, the formation of non-covalent interactions such as the hydrophobic aggregation induced by the salting-out effect, ionic interactions between the -NH3+ of gelatin and Cit(3-) anions, and hydrogen bonding between gelatin chains and glycerol endows the organohydrogels with high mechanical strength and toughness. The supramolecular organohydrogel can maintain its mechanical flexibility even at -80 degrees C or be stored for a long time. Moreover, the nature of noncovalent interactions endows the organohydrogel with intriguing thermoplasticity, good healable ability, and excellent adhesive behavior at various substrate surfaces.
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