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Stretchable Cellulosic Cholesteric Liquid Crystal Filaments with Color Response
Hongning Ren1,2, Ifeoluwa Omolola Sodipo1,2, Ahu Gümrah Dumanli1,2
1Department of Materials, The University of Manchester, Oxford Rd., Manchester M13 9PL, United Kingdom.
ACS Applied Polymer Materials
|April 17, 2025
Summary
Researchers created stretchable liquid crystal filaments that change color with mechanical force. This innovation offers a new approach to soft optical sensors for robotics and wearable technology.
Area of Science:
- Materials Science
- Soft Robotics
- Wearable Technology
Background:
- Soft optical materials offer potential for mechanochromic sensing in soft robotics and wearables.
- Existing methods may lack the required stretchability and responsiveness for dynamic applications.
Purpose of the Study:
- To develop stretchable cholesteric cellulosic liquid crystal filaments for mechanochromic sensing.
- To investigate the color-changing properties of these filaments in response to mechanical deformation.
Main Methods:
- Encapsulation of aqueous hydroxypropyl cellulose (HPC) mesophases within thermoplastic elastomeric tubing.
- Induction of a cholesteric liquid crystal structure through tubular confinement.
- Analysis of flow properties and mechanical response for colorimetric sensing.
Main Results:
- Successfully fabricated stretchable cholesteric liquid crystal filaments.
- Demonstrated spontaneous color change in response to tensile and compression forces.
- Observed uniform alignment and dynamic deformation of the HPC mesophase.
Conclusions:
- The developed soft optical system functions as a stretchable colorimetric sensor.
- This technology is suitable for applications in soft robotics and functional wearables requiring mechanical feedback.
