Hydrogen Bond-Mediated Self-Shielded Moisture-Responsive Structural Color for Time-Temperature Indicating.
Donghui Kou1, Lei Gao1, Ruicheng Lin1
1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 26, 2024
Summary
New time-temperature indicators (TTIs) use moisture-responsive 1D photonic crystals for reliable cold chain monitoring. These indicators offer customizable ranges and easy application, ensuring product quality and efficacy.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Effective cold chain management is vital for preserving the quality and efficacy of sensitive products like biological reagents, drugs, and foods.
- Existing time-temperature indicators (TTIs) often suffer from limitations including complex application, narrow monitoring ranges, photobleaching, and pre-use instability.
- These limitations hinder the widespread adoption and reliability of current TTI technologies in real-world cold chain logistics.
Purpose of the Study:
- To develop novel time-temperature indicators (TTIs) based on moisture-responsive 1D photonic crystals (1DPCs).
- To address the limitations of current TTIs by creating indicators with robust structural colors, tunable ranges, and enhanced stability.
- To demonstrate the potential of these new TTIs for reliable, naked-eye monitoring of cold chain conditions.
Main Methods:
- Fabrication of 1D photonic crystal (1DPC) structures designed for moisture responsiveness.
- Characterization of the structural colors and color-changing behavior in response to varying humidity and temperature.
- Evaluation of indicator stability during prolonged storage at low temperatures and room temperature before use.
Main Results:
- Demonstrated the first moisture-responsive 1DPC TTIs exhibiting distinct, stable structural colors.
- Showcased tunable time-temperature tracking ranges and reliable renewability of the indicator function.
- Confirmed that moisture responsiveness diminishes predictably at elevated temperatures due to hydrogen bond formation, enabling visual assessment of product efficacy.
Conclusions:
- The developed 1DPC TTIs offer a promising solution for accurate and convenient cold chain monitoring.
- Their robustness, customizable ranges, and ease of use, including room-temperature pre-use stability, indicate significant market potential.
- These indicators facilitate naked-eye inspection, enhancing the reliability of cold chain logistics for sensitive products.
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