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Nanostructured Temperature Indicator for Cold Chain Logistics.

Anastasiya Navrotskaya1, Darya Aleksandrova1, Mahshid Chekini2

  • 1SCAMT Institute, ITMO University, St. Petersburg 197101, Russian Federation.

ACS Nano
|April 22, 2022
PubMed
Summary
This summary is machine-generated.

A new nanostructured temperature indicator using cellulose nanocrystals and carbon dots offers reliable cold chain monitoring. This cost-efficient, stable sensor accurately tracks temperatures from -68 to +19 °C.

Keywords:
carbon dotscellulose nanocrystalsfluorescencesolvatochromismtemperature indicator

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Cold chain logistics are critical for temperature-sensitive products like food, pharmaceuticals, and vaccines.
  • Current time-temperature indicators have limitations in temperature range, thermal stability, and photostability.

Purpose of the Study:

  • To develop a novel nanostructured solvatochromic temperature indicator for expanded low-temperature monitoring.
  • To address the limitations of existing time-temperature indicators in cold chain applications.

Main Methods:

  • Fabrication of a nanostructured film using cellulose nanocrystals decorated with carbon dots (C-dots).
  • Utilizing the nonlinear photoluminescence dependence of C-dots on water/dimethyl sulfoxide (DMSO) solvent composition.
  • Leveraging the composition-dependent melting temperature of the water/DMSO mixture for irreversible signal generation.

Main Results:

  • The indicator demonstrates a broad temperature monitoring range from -68 to +19 °C.
  • Irreversible changes in photoluminescence intensity and wavelength signal temperature threshold breaches.
  • The indicator exhibits cost-efficiency, portability, and enhanced photo- and thermostability.

Conclusions:

  • The developed C-dot decorated cellulose nanocrystal indicator provides a robust and versatile solution for cold chain temperature monitoring.
  • This technology offers a significant improvement over existing time-temperature indicators, particularly in extreme low-temperature environments.