A thermo-responsive hydrogel for body temperature-induced spontaneous information decryption and self-encryption
Tingying Zhang1, Wei Wang1,2, Xiaojie Ju1,2
1School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China. xierui@scu.edu.cn.
Chemical Communications (Cambridge, England)
|June 24, 2024
Summary
This study introduces a thermo-responsive poly(N-isopropylacrylamide) hydrogel that changes from opaque to transparent and back. This smart hydrogel can read and rewrite quick response codes when triggered by body temperature.
Area of Science:
- Materials Science
- Polymer Chemistry
- Smart Materials
Background:
- Poly(N-isopropylacrylamide) (PNIPAM) hydrogels exhibit thermo-responsive properties.
- The opaque-transparent-opaque transition is a key characteristic of these hydrogels upon heating and cooling.
- Applications in responsive materials are continually being explored.
Purpose of the Study:
- To fabricate a novel thermo-responsive PNIPAM hydrogel.
- To investigate its unique opaque-transparent-opaque transition phenomenon.
- To demonstrate its capability for spontaneous code decryption and encryption.
Main Methods:
- Fabrication using hydroxypropyl cellulose for porogenic effect and PNIPAM cononsolvency in a DMSO/water mixture.
- Utilizing body temperature as a trigger for hydrogel response.
- Observing and analyzing the time-dependent optical transitions and code interactions.
Main Results:
- Successfully synthesized a thermo-responsive PNIPAM hydrogel.
- Observed a distinct opaque-transparent-opaque transition upon thermal cycling.
- Demonstrated spontaneous decryption of a quick response code within 4 minutes and re-encryption within 10 minutes at room temperature.
Conclusions:
- The developed PNIPAM hydrogel exhibits tunable optical properties based on temperature.
- The hydrogel's rapid response to thermal stimuli enables dynamic information encryption/decryption.
- The study elucidates the mechanism behind transient transparency during cooling, paving the way for advanced smart materials.
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