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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Spiropyran (SP) molecules can be functionalized onto surfaces for sensing applications.
  • Mechanophore activation, the conversion of a molecule in response to mechanical force, is a key area of materials research.

Purpose of the Study:

  • To investigate the effect of surface curvature and roughness on spiropyran mechanophore activation.
  • To demonstrate force-induced activation of spiropyran at glass-polymer interfaces.

Main Methods:

  • Functionalization of planar and curved glass surfaces with spiropyran molecules.
  • UV-induced activation and fluorescence spectroscopy to monitor mechanophore conversion.
  • Single fiber microbond testing to induce shear loading at glass-polymer interfaces.

Main Results:

  • Increased surface roughness and curvature enhance spiropyran to merocyanine conversion.
  • Force-induced activation of spiropyran was achieved at curved glass-polymer interfaces, but not planar ones.
  • Spiropyran activation was detected at relatively low shear stress levels at the interface.

Conclusions:

  • Surface geometry significantly influences mechanophore activation efficiency.
  • Curved glass-polymer interfaces provide a viable platform for detecting mechanical stress via spiropyran activation.
  • This work offers a more efficient mechanism for eliciting the spiropyran response by directly loading the interface.