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A Self-Healing Nanofiber-Based Self-Responsive Time-Temperature Indicator for Securing a Cold-Supply Chain.

Sejin Choi1, Youngho Eom1,2, Seon-Mi Kim1

  • 1Research Center for Bio-based Chemistry, Korea Research Institute of Chemical Technology (KRICT), Ulsan, 44429, Republic of Korea.

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Summary

A novel self-healing nanofiber mat acts as a time-temperature indicator (TTI) for perishable foods. This damage-tolerant mat signals temperature abuse, preventing foodborne illnesses and reducing supply chain costs.

Keywords:
foodborne illnessself-healing nanofibersthermodynamic energytime-temperature indicatorstransparency

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Area of Science:

  • Materials Science
  • Food Science
  • Chemical Engineering

Background:

  • Foodborne illnesses pose significant societal costs due to improper refrigeration.
  • Existing time-temperature indicators (TTIs) often lack flexibility, interpretability, or damage tolerance.

Purpose of the Study:

  • To develop a novel, damage-tolerant, and sensitive time-temperature indicator (TTI) for monitoring refrigeration in food supply chains.
  • To create a TTI that is flexible, easy-to-interpret, and self-healing.

Main Methods:

  • A self-healing nanofiber mat was devised, exhibiting opacity when refrigerated (light scattering) and irreversibly becoming transparent at room temperature (interfibrillar fusion).
  • The mat's tunable timer (0.5–22.5 h) was controlled via polymer composition and film thickness.
  • The mat's functionality was tested under various conditions, including crushing, cutting, and weight loading.

Main Results:

  • The nanofiber mat functions as both a temperature sensor and display, indicating temperature abuse through a visual change from opaque to transparent.
  • The TTI accurately measures localized or gradient heat and is effective across freezer (-20 °C) and chiller (2 °C) temperature ranges.
  • The mat demonstrated significant damage tolerance, functioning after mechanical stress that would impair conventional TTIs.

Conclusions:

  • The self-healing nanofiber mat offers a robust and sensitive solution for certifying refrigeration succession in food supply chains.
  • This intrinsic physical response-based TTI eliminates the need for drainable chemicals and modularization, providing a versatile monitoring tool.