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Reversible Nontoxic Thermochromic Microcapsules.

Bingxin Liu1, Alicia Rasines Mazo1, Paul A Gurr1

  • 1Polymer Science Group, Department of Chemical Engineering , The University of Melbourne , Parkville , VIC 3010 , Australia.

ACS Applied Materials & Interfaces
|February 4, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed nontoxic microcapsules using chlorophenol red (CPR) and silicone shells. These thermochromic materials change color with temperature and are safe for inks, films, and intelligent packaging.

Keywords:
inknontoxicprintreversiblethermochromic

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Thermochromic materials change color with temperature, enabling applications in smart materials.
  • Developing nontoxic microcapsules for thermochromic applications in inks and films presents significant challenges.
  • Existing methods often involve toxic components or lack robust encapsulation.

Purpose of the Study:

  • To develop a novel, nontoxic thermochromic system using chlorophenol red (CPR) and create robust microcapsules with silicone shells.
  • To evaluate the thermochromic properties, reversibility, and applicability of the developed microcapsules in inks and films.
  • To confirm the nontoxicity of the microcapsules and derived materials for safe application.

Main Methods:

  • A nontoxic chlorophenol red (CPR)-water thermochromic system was synthesized.
  • Silicone-shelled microcapsules were fabricated via interfacial reaction of water and octadecyltrichlorosilane (OTS) in a w/o emulsion.
  • Microcapsules were tested for color change, reversibility, and incorporated into screen-printed inks and polymer films.
  • Nontoxicity was assessed using cell cytotoxicity assays.

Main Results:

  • Successfully created reversible, nontoxic thermochromic microcapsules with clear color transitions.
  • Demonstrated successful application of microcapsules as screen-printing inks and film additives.
  • Confirmed the safety of the microcapsules and films through rigorous cytotoxicity testing.

Conclusions:

  • The developed CPR-silicone microcapsules offer a safe and effective thermochromic solution.
  • These materials are suitable for next-generation intelligent sensors, coatings, and food packaging.
  • This work overcomes previous limitations in creating nontoxic, functional thermochromic microcapsules.