Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 22, Pages 6568-6571Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201803366
Keywords
anti-freezing; non-drying; organohydrogels; solvent displacement; tough hydrogels
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Funding
- National Natural Science Foundation of China [21674064]
- Shenzhen Science and Technology Foundation [JCYJ20160520173802186]
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Tough hydrogels, polymeric network structures with excellent mechanical properties (such as high stretchability and toughness), are emerging soft materials. Despite their remarkably mechanical features, tough hydrogels exhibit two flaws (freezing around the icing temperatures of water and drying under arid conditions). Inspired by cryoprotectants (CPAs) used in the inhibition of the icing of water in biological samples, a versatile and straightforward method is reported to fabricate extreme anti-freezing, non-drying CPA-based organohydrogels with long-term stability by partially displacing water molecules within the pre-fabricated hydrogels. CPA-based Ca-alginate/polyacrylamide (PAAm) tough hydrogels were successfully fabricated with glycerol, glycol, and sorbitol. The CPA based organohydrogels remain unfrozen and mechanically flexible even up to -70 degrees C and are stable under ambient conditions or even vacuum.
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