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Inorganic Salts Induce Thermally Reversible and Anti‐Freezing Cellulose Hydrogels
Author(s) -
Zhang XiongFei,
Ma Xiaofeng,
Hou Ting,
Guo Kechun,
Yin Jiayu,
Wang Zhongguo,
Shu Lian,
He Ming,
Yao Jianfeng
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201902578
Subject(s) - cellulose , self healing hydrogels , chemical engineering , chemistry , glycerol , ionic conductivity , ionic liquid , ionic bonding , polymer chemistry , ion , organic chemistry , electrolyte , catalysis , electrode , engineering
Inspired by the anti‐freezing mechanisms found in nature, ionic compounds (ZnCl 2 /CaCl 2 ) are integrated into cellulose hydrogel networks to enhance the freezing resistance. In this work, cotton cellulose is dissolved by a specially designed ZnCl 2 /CaCl 2 system, which endows the cellulose hydrogels specific properties such as excellent freeze‐tolerance, good ion conductivity, and superior thermal reversibility. Interestingly, the rate of cellulose coagulation could be promoted by the addition of extra water or glycerol. This new type of cellulose‐based hydrogel may be suitable for the construction of flexible devices used at temperature as low as −70 °C.