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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

520
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
520

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Stretchable Distributed Bragg Reflectors as Strain-Responsive Mechanochromic Sensors.

Martina Martusciello1, Andrea Lanfranchi1, Maila Castellano1

  • 1Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genoa, Italy.

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Summary

This study introduces mechanochromic photonic crystals that change color with mechanical strain, enabling naked-eye detection without external excitation. These distributed Bragg reflectors offer reversible, instantaneous color shifts for advanced sensing applications.

Keywords:
elastomersmechanochromismmultilayer filmspolymer photonic crystalsstrain sensorsstructural colors

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Area of Science:

  • Materials Science
  • Optics
  • Polymer Science

Background:

  • Mechanochromic materials change color with mechanical stress, useful for sensing and displays.
  • Current materials often require external optical or electrical excitation for color detection.
  • Photonic crystals offer a pathway for naked-eye detectable mechanochromic responses.

Purpose of the Study:

  • To develop mechanochromic photonic crystals for visible and near-infrared color changes.
  • To engineer distributed Bragg reflectors (DBRs) with tunable mechanochromic properties.
  • To achieve color changes detectable by the naked eye without complex instrumentation.

Main Methods:

  • Fabrication of elastomeric distributed Bragg reflectors (DBRs) using alternating fluoropolymer and styrene-butadiene copolymer thin films.
  • Application of varying elastomeric substrates to tune DBR behavior.
  • Characterization of photonic bandgap shifts under mechanical strain up to 100%.

Main Results:

  • Demonstrated reversible and instantaneous photonic bandgap shifts across near-infrared to visible wavelengths.
  • Achieved mechanochromic sensitivity ranging from 1.7-6.9 nm/% and 80 nm/MPa.
  • Determined an optical Poisson's ratio between 0.3-0.7, dependent on spectral properties and diffraction order.

Conclusions:

  • Engineered DBRs exhibit significant mechanochromic behavior, suitable for visual strain detection.
  • The developed photonic crystals provide a platform for advanced, intrinsically visual mechanochromic sensors.
  • The spectral dependence of mechanochromic properties allows for tailored applications.