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Updated: Jun 26, 2025

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

Programming Positive Mechanofluorescence in Liquid Crystalline Elastomers.

Pedro Güixens-Gallardo^1,2, Ignacio Brea¹, Jordi Manrique¹

¹Grup de Materials Orgànics, Departament de Química Inorgànica i Orgànica (Secció de Química Orgànica), Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain.

ACS Applied Polymer Materials

|May 16, 2024

Summary

This summary is machine-generated.

Researchers developed novel liquid single crystal elastomers (LSCEs) that exhibit positive mechanofluorescence, meaning their light emission increases under mechanical stress. This breakthrough, achieved using fluorescent molecular rotors, offers a new way to detect forces with smart materials.

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Area of Science:

Materials Science
Polymer Chemistry
Spectroscopy

Background:

Liquid single crystal elastomers (LSCEs) with embedded organic fluorophores are used for force detection via spectroscopy.
Existing LSCEs show negative mechanofluorescence (decreased emission under stress) due to quenching effects.
This phenomenon is caused by mechanically induced proximity of quenching mesogenic units and fluorophores.

Purpose of the Study:

To develop LSCEs with positive mechanofluorescence (increased emission under stress).
To integrate fluorescent molecular rotors (FMRs) into LSCEs for enhanced force sensing capabilities.
To design elastomeric materials with tunable mechano-optical responses.

Main Methods:

Incorporation of fluorescent molecular rotors (FMRs), specifically carbazole-indolenine dyes, into the LSCE network.
Utilizing FMRs whose luminescence is independent of mesogenic quenching.
Applying uniaxial deformation along the anisotropic direction of the LSCE.

Main Results:

Demonstrated positive mechanofluorescence in LSCEs containing FMRs.
Observed enhanced luminescence emission upon mechanical deformation.
Established a correlation between restricted local environment and increased fluorescence intensity.

Conclusions:

Fluorescent molecular rotors offer a viable strategy for creating positive mechanofluorescence in LSCEs.
LSCEs with FMRs provide a novel platform for advanced force-sensing applications.
The observed phenomenon opens new avenues for designing smart materials with tailored mechano-optical properties.