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Thermoresponsive and Strain-Sensitive Hydrogels with Inscribable Transparency-Based Dynamic Memory Behaviors.

Huabiao Ye1,2, Ting Dong1,2,3, Shaohua Wu1,2

  • 1College of Textile and Clothing, Qingdao University, 308 Ningxia Road, Qingdao 266071, P.R. China.

ACS Applied Materials & Interfaces
|February 28, 2025
PubMed
Summary

Researchers developed smart hydrogels with dynamic transparency that can remember and forget information. These advanced materials offer new possibilities for health monitoring and drug delivery systems.

Keywords:
NIR-triggered drug releaseoptical transparencysmart hydrogelsstrain sensorthermoresponsetransparency-based memory

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Intelligent hydrogel dressings are crucial for personal health management, requiring optical transparency, stretchability, and conductivity.
  • Current limitations include weak perceptive elements and the use of black conductive polymers, hindering advanced hydrogel fabrication.

Purpose of the Study:

  • To develop smart hydrogels with inscribable dynamic memorizing-forgetting transparency behavior.
  • To create a material capable of perceiving environmental stimuli and storing/recalling information.

Main Methods:

  • In situ degradation and immobilization of conductive polydopamine-doped polypyrrole (PDA-PPy) nanodots into a poly(NIPAm-co-acrylic acid) copolymer/polyacrylamide (PNAc/PAM) network.
  • Utilizing temperature-induced structural shifts and pH-dependent protonation for transparency control and information encoding.

Main Results:

  • The fabricated hydrogels exhibit optical transparency (~64.99%), stretchability (~1052%), self-adhesion (21-105 kPa), and high conductivity (~0.8 S/m).
  • Demonstrated temperature-induced reversible transparency control and programmed dynamic memory for information memorizing-forgetting-recalling based on pH-engraved transparency evolution.
  • Successfully applied as near-infrared (NIR) light-controlled drug release carriers and soft sensors with high strain sensitivity (GF = 5.98) and rapid response (139 ms).

Conclusions:

  • The developed smart hydrogels offer a novel platform for advanced health management applications, including drug delivery and wearable sensors.
  • The unique dynamic transparency and memory capabilities pave the way for sophisticated bio-integrated devices.
  • The material's properties address key limitations in current intelligent hydrogel development.