Spatially and Temporally Programmable Transparency Evolutions in Hydrogels Enabled by Metal Coordination toward
Jin Zhao1,2, Yichen Zhou1, Xing Zhang1
1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China.
Small (Weinheim an Der Bergstrasse, Germany)
|March 27, 2024
Summary
Researchers developed a simple method for creating transient anticounterfeiting hydrogels using metal-ion coordination. These dynamic materials offer enhanced security for encrypted information through tunable temperature responses.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Hydrogels are explored for anticounterfeiting due to stimulus-responsive properties.
- Existing methods for dynamic anticounterfeiting hydrogels involve complex chemistry and preparation.
- There is a need for facile strategies to create transient anticounterfeiting materials.
Purpose of the Study:
- To propose a facile strategy for transient anticounterfeiting hydrogels.
- To enable dynamic information display and enhance security in anticounterfeiting applications.
- To develop hydrogel materials with tunable cloud points (Tc) using metal-ion coordination.
Main Methods:
- Constructed bivalent metal (M2+)-coordination complexes within poly(acrylic acid) gels.
- Tuned the cloud temperature (Tc) of the hydrogels by varying M2+ concentration.
- Spatially programmed multi-Tc regions in the gel via selective diffusion of M2+.
Main Results:
- Achieved feasible tuning of hydrogel cloud temperature (Tc) through M2+ concentration.
- Demonstrated localized programming of multi-Tc parts by controlling M2+ diffusion.
- Observed spontaneous evolution of transparency in multi-Tc hydrogel parts under natural light with temperature changes or complexing agents.
Conclusions:
- A facile strategy for transient anticounterfeiting hydrogels was successfully developed.
- The metal-ion coordination approach provides a new mechanism for dynamic information display.
- This work offers advanced anticounterfeiting hydrogel materials with improved security features.
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