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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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Cascade Fluorescence Modulation in Photochromic Microcapsules.

Magin Benedict Ferrer1,2, Daiyu Harada1, Colin J Martin1

  • 1Graduate School of Science and Technology, Nara Institute of Science and Technology, NAIST, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan.

ACS Applied Materials & Interfaces
|September 25, 2024
PubMed
Summary
This summary is machine-generated.

Terarylene derivatives exhibit a unique cascade effect for radiation detection. This system, when microencapsulated with Nile Red, enables reusable, wavelength-selective fluorescence photoswitching for advanced sensor applications.

Keywords:
Pickering emulsioncascade effectfluorescenceoxidative cycloreversionphotochromism

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Area of Science:

  • Photochemistry
  • Materials Science
  • Chemical Sensing

Background:

  • Terarylene derivatives demonstrate efficient oxidative cycloreversion with quantum yields > 1, causing a color change.
  • Previous systems using chloroform for radiation detection lacked wavelength selectivity and reusability.
  • Nile Red enhances visual detection through fluorescence photoswitching.

Purpose of the Study:

  • To develop a reusable, wavelength-selective system for detecting ionizing radiation.
  • To integrate terarylene's cascade effect with Nile Red's fluorescence photoswitching.
  • To achieve a single microencapsulated system exhibiting both phenomena.

Main Methods:

  • Utilized chlorobenzene as a wavelength-selective solvent for photocyclization and cycloreversion.
  • Incorporated Nile Red to enhance sensitivity via fluorescence photoswitching.
  • Employed Pickering emulsion to microencapsulate terarylene and Nile Red.

Main Results:

  • The terarylene-Nile Red system in microcapsules demonstrated high fatigue resistance for repeated photocyclization and cycloreversion.
  • Achieved repeatable ON/OFF fluorescence photoswitching.
  • Successfully demonstrated the cascade effect with fluorescence recovery, proving versatility in different media.

Conclusions:

  • Microencapsulated terarylene-Nile Red systems offer a versatile platform for reusable, wavelength-selective photoswitching sensors.
  • The combined cascade effect and fluorescence photoswitching provide a robust method for visual detection of radiation.
  • This system shows significant potential for advanced optical sensing applications.