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Solid Materials with Tunable Reverse Photochromism.

Alex Julià-López1, Daniel Ruiz-Molina1, Jordi Hernando2

  • 1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology (BIST) , Campus UAB , Bellaterra , Barcelona 08193 , Spain.

ACS Applied Materials & Interfaces
|March 1, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for tunable reverse photochromism using spiropyran dyes. This strategy allows for stable, multicolored, rewritable devices by controlling dye states in solid materials.

Keywords:
merocyanine formsmicrocapsulesreverse/negative photochromismrewritable devicesspiropyrans

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Area of Science:

  • Materials Science
  • Photochemistry

Background:

  • Spiropyran dyes exhibit photochromism, switching between colored and colorless states.
  • Controlling the stability and properties of these states is crucial for applications.

Purpose of the Study:

  • To develop a universal strategy for highly tunable reverse photochromism in solid materials.
  • To create rewritable multicolored devices using photochromic materials.

Main Methods:

  • Utilized commercially available spiropyran dyes to form stable merocyanine states (nonprotonated and protonated).
  • Controlled the ratio of these states by exploiting differential interactions with protic and aprotic polar solvents.
  • Encapsulated solutions in core-shell capsules to create inks for flexible polymeric films.

Main Results:

  • Achieved distinct reverse photochromic properties (colors, coloration rates) by tuning merocyanine state concentrations.
  • Demonstrated a method applicable to various spiro dyes without chemical derivatization.
  • Fabricated flexible films with tunable, rewritable multicolored photochromic properties.

Conclusions:

  • The reported strategy offers unprecedented tunability for solid-state photochromic materials.
  • This approach enables the development of novel rewritable multicolored devices.
  • The method is generalizable to other spiropyran dyes with varying acid-base properties.