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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Self-Regulated Smectic Emulsion with Switchable Lasing Application.

Dae Seok Kim¹, Wonsuk Lee², Teresa Lopez-Leon¹

¹UMR Gulliver 7083 CNRS, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005, Paris, France.

Small (Weinheim an Der Bergstrasse, Germany)

|October 12, 2019

Summary

This summary is machine-generated.

Researchers developed a switchable liquid crystal (LC) emulsion using rod-like molecules. This novel system allows for reversible emulsification and trapping of guest materials, like fluorescent dyes for on-off lasing, without additives or special equipment.

Keywords:

emulsions liquid crystal self-regulation switchable lasing

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Area of Science:

Materials Science
Soft Matter Physics
Supramolecular Chemistry

Background:

Liquid crystal (LC) emulsions are advanced materials with tunable properties.
Creating stable and functional LC emulsions often requires surfactants or complex fabrication methods.

Purpose of the Study:

To present a novel, structurally reversible smectic liquid crystal (LC) emulsion.
To demonstrate a simple, additive-free method for forming monodisperse LC structures.
To showcase the potential of this emulsion as a platform for switchable emulsification and guest material encapsulation.

Main Methods:

Utilizing semifluorinated rod-type molecules within a silicon oil matrix.
Employing simple heating and cooling cycles to control the emulsion's phase transitions.
Observing spontaneous formation of spherical and myelin-like LC structures upon cooling.

Main Results:

Achieved a structurally reversible smectic LC emulsion without surfactants, polymers, or emulsifiers.
Demonstrated spontaneous formation of monodisperse spherical and myelin-like LC structures.
Showcased repeatable and reliable switchable emulsification capabilities.
Successfully confined fluorescent dyes within LC droplets to create an on-off lasing system.

Conclusions:

The developed LC emulsion offers a facile and robust platform for advanced material applications.
The system's reversibility and ease of fabrication open new avenues for responsive materials and controlled encapsulation.
This work highlights the potential of self-assembling LC systems for creating functional devices like switchable lasers.