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  11. Self-adaptive Photochromism

Self-adaptive photochromism

Fanxi Sun1, Ang Gao1, Boyun Yan1

  • 1School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.

Science Advances
|November 6, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed self-adaptive photochromism (SAP) materials for intrinsic active camouflage. These novel materials change color spontaneously, overcoming the limitations of electronic camouflage systems.

Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Active camouflage in nature allows organisms to adapt their appearance to surroundings.
  • Current artificial active camouflage relies on complex, costly, and difficult-to-use electronic systems.

Purpose of the Study:

  • To introduce self-adaptive photochromism (SAP) as an intrinsic material property for active camouflage.
  • To develop a new class of materials that can change color without external electronic components.

Main Methods:

  • Fabrication of SAP materials using donor-acceptor Stenhouse adducts (DASAs) as negative photochromic phases and organic dyes as fixed phases.
  • Utilizing light-induced linear-to-cyclic isomerization of DASAs to create an absorption gap and switch color.
  • Incorporating SAP materials into polycaprolactone films and coatings.

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Main Results:

  • The SAP materials exhibit a primary black state in darkness and spontaneously change color when exposed to background light.
  • The color change is triggered by transmitted and reflected light, enabling adaptive camouflage.
  • SAP films and coatings demonstrated applicability to diverse surfaces.

Conclusions:

  • Self-adaptive photochromism (SAP) offers a viable intrinsic material solution for active camouflage.
  • This approach bypasses the need for complex electronic devices, simplifying structure and improving usability.
  • SAP materials present a promising, cost-effective alternative for advanced camouflage technologies.