A thermo-responsive hydrogel for body temperature-induced spontaneous information decryption and self-encryption

A thermo-responsive poly( N -isopropylacrylamide) (PNIPAM) hydrogel, exhibiting an interesting phenomenon of an opaque-transparent-opaque transition in the successive processes of heating and cooling, is reported. It is fabricated by means of both the porogenic effect of hydroxypropyl cellulose and...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2024-07, Vol.6 (56), p.7156-7159
Main Authors: Zhang, Tingying, Wang, Wei, Ju, Xiaojie, Liu, Zhuang, Pan, Dawei, Xie, Rui, Chu, Liangyin
Format: Article
Language:English
Subjects:
Body temperature
Dimethyl sulfoxide
Encryption
Hydrogels
Hydroxypropyl cellulose
Polyisopropyl acrylamide
Quenching
Room temperature
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Summary:A thermo-responsive poly( N -isopropylacrylamide) (PNIPAM) hydrogel, exhibiting an interesting phenomenon of an opaque-transparent-opaque transition in the successive processes of heating and cooling, is reported. It is fabricated by means of both the porogenic effect of hydroxypropyl cellulose and the cononsolvency effect of PNIPAM in a mixed solvent of dimethyl sulfoxide and water. After being mildly triggered by body temperature, the hydrogel is used to spontaneously decrypt the quick response code within 4 min and then autonomously encrypts the code again within 10 min at room temperature. The mechanism for the transient transparency of hydrogels during the quenching process has been elucidated. A poly( N -isopropylacrylamide) hydrogel spontaneously decrypts after being mildly triggered by body temperature, and autonomously encrypts in air at room temperature.
ISSN:1359-7345
1364-548X
1364-548X
DOI:10.1039/d4cc01349b