"Confined Eutectic" Strategy for Visual Refrigeration Responsive Fluorescent Materials with Easy Preparation and...

Area of Science:

• Materials Science
• Chemical Engineering
• Physical Chemistry

Background:

• Thermofluorochromic materials are crucial for temperature sensing, with refrigeration temperature indication vital for public health and food safety.
• Developing visual readout materials for refrigeration temperatures presents significant challenges.

Purpose of the Study:

• To propose a "confined eutectic" strategy for creating novel fluorochromic materials.
• To enable naked-eye recognition of refrigeration temperatures (0-10 °C) using these materials.

Main Methods:

• Utilizing supramolecular interactions to form eutectic micro-domains with lowered crystallization points.
• Employing a crystalline host matrix for a "confinement" effect to enhance eutectic crystallinity.
• Validating the mechanism using variable-temperature fluorescence spectra, confocal laser scanning microscopy, and phase diagram analysis.

Main Results:

• Successfully developed fluorochromic materials with a temperature response window in the 0-10 °C range.
• Achieved precise aggregation and dispersion of fluorophores, leading to significant, visually discernible color changes.
• Demonstrated high fluorescence color contrast and applicability to diverse dyes for multi-mode, multi-color readout.

Conclusions:

• The "confined eutectic" strategy offers a novel approach for preparing visual refrigeration temperature indicators.
• This method provides new insights into temperature-responsive fluorochromic materials and visual crystallinity regulation.
• The developed materials have potential applications in food safety and public health monitoring.