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Horseradish Peroxidase-Triggered Polydopamine-Modified Chitosan Hydrogels for Electrically Programmed and

Yuting Li¹, Mengyi Liu¹, Feng Hu¹

¹School of Resource and Environmental Science, Hubei Engineering Center of Natural Polymers-Based Medical Materials, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China.

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Summary

This study presents a novel chitosan hydrogel that stores and self-erases visible information without external triggers. Electrical writing embeds data, enabling dynamic information storage and security applications.

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Area of Science:

Materials Science
Biomaterials Science
Polymer Chemistry

Background:

Hydrogels are highly responsive materials with potential for dynamic information storage.
Self-erasing, visible information offers a unique approach to data security.

Purpose of the Study:

To develop a chitosan-based hydrogel capable of automatically revealing and erasing information.
To explore electrical writing for embedding data within the hydrogel matrix.
To investigate methods for controlling information lifetime and decryption.

Main Methods:

Fabrication of a polydopamine (PDA)-modified chitosan (CS) hydrogel.
Information embedding via an electrical writing process inducing localized pH changes.
Enzymatic polymerization of dopamine (DA) triggered by localized pH for information display.
Regulation of information lifetime through electrical writing parameters.

Main Results:

The CS hydrogel automatically revealed embedded information without external stimuli.
Mismatched dopamine oxidation kinetics between written and unwritten regions led to information display and time-dependent erasure.
Information lifetime was precisely controlled by electrical writing parameters (cycles, current magnitude).
The system allowed for complex information decryption and recognition of valid/invalid signals.

Conclusions:

The developed PDA-modified CS hydrogel offers a promising platform for self-erasing, visible information storage.
Electrical writing provides a controllable method for data embedding and dynamic information management.
This technology has potential applications in secure data storage and smart materials.