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Sublimation

Sublimation

Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...

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Stimulus-Responsive Supercooled π-Conjugated Liquid and Its Application in Rewritable Media.

Yuika Sato¹, Yuichiro Mutoh², Shuhei Morishita¹

¹Division in Advanced Materials Science, Graduate School of Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan.

The Journal of Physical Chemistry Letters

|March 18, 2021

Summary

Researchers developed a stimulus-responsive supercooled liquid that changes color when transitioning between liquid and solid states. This discovery opens possibilities for rewritable media applications using its unique photoluminescent properties.

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Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Supercooled liquids offer unique material properties.
Stimulus-responsive materials are crucial for advanced applications.
π-conjugated systems are key for optoelectronic functionalities.

Purpose of the Study:

To report a novel stimulus-responsive supercooled π-conjugated liquid.
To investigate its potential application in rewritable media.
To characterize the observed photoluminescent color change.

Main Methods:

Synthesis and characterization of a π-conjugated liquid (1).
Induction of phase transition from liquid (1l) to solid (1s) state.
Analysis of photoluminescence using fluorescence spectra and lifetime decay profiles.

Main Results:

The supercooled liquid (1) exhibited a dramatic photoluminescent color change.
Liquid state (1l) showed yellow emission, while solid state (1s) displayed green emission.
Fluorescence spectra and lifetime decay data confirmed the transformation.

Conclusions:

A novel stimulus-responsive supercooled π-conjugated liquid was successfully synthesized.
The observed reversible color change demonstrates potential for rewritable media.
Further research can explore optimization for practical device applications.