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Sticky Multicolor Mechanochromic Labels.

Lucas D C de Castro^1,2, Tom A P Engels³, Osvaldo N Oliveira¹

¹São Carlos Institute of Physics, University of São Paulo, São Carlos 13566-590, SP, Brazil.

ACS Applied Materials & Interfaces

|March 6, 2024

Summary

This summary is machine-generated.

Researchers developed dynamic sticky labels that change color when stretched. These adaptable mechanochromic labels offer new possibilities for smart materials and applications requiring visual feedback upon deformation.

Keywords:

cholesteric liquid crystal elastomers labels mechanochromic devices stickers wearable devices

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Area of Science:

Materials Science
Polymer Chemistry
Optics

Background:

Traditional sticky labels are static and lack dynamic visual feedback capabilities.
Mechanical deformation of materials often goes unindicated visually.
There is a need for adaptable materials that can provide visual cues in response to physical changes.

Purpose of the Study:

To introduce a novel category of dynamic sticky labels with mechanochromic properties.
To demonstrate a method for creating patterned structural colors that respond to mechanical stimuli.
To explore the potential applications of these responsive labels.

Main Methods:

Development of sticky mechanochromic labels based on cholesteric liquid crystal elastomers (CLCEs).
Utilizing ultraviolet (UV) cross-linking with a photomask to imprint structural color patterns.
Controlling cross-linking degree and volumetric response to induce color changes upon stretching.

Main Results:

Successfully created dynamic sticky labels that exhibit structural color changes when stretched.
Demonstrated a method for imprinting patterns that are always visible or reversibly revealed/concealed.
Observed potential color-separation effects due to Poisson's ratio contrast.

Conclusions:

The developed sticky mechanochromic labels offer a new platform for visual communication through structural color changes.
These labels are applicable to various surfaces, including flexible and brittle materials.
Potential applications include stress-strain sensing, smart clothing, security features, and decorative elements.