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A NIR-responsive azobenzene-based supramolecular hydrogel using upconverting nanoparticles.

Gabrielle A Mandl1, Paola A Rojas-Gutierrez, John A Capobianco

  • 1Department of Chemistry and Biochemistry and Centre for NanoScience Research Concordia University, 7141 Sherbrooke St. West Montreal, Quebec H4B 1R6, Canada. John.Capobianco@concordia.ca.

Chemical Communications (Cambridge, England)
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Summary
This summary is machine-generated.

This study introduces a novel supramolecular hydrogel system that utilizes upconverting nanoparticles for near-infrared light-triggered gel-sol transitions, eliminating the need for direct UV excitation.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Supramolecular hydrogels offer tunable properties but often require UV light for actuation.
  • Azobenzene-based systems are sensitive to light but typically need UV wavelengths.
  • Upconverting nanoparticles (UCNPs) can convert near-infrared (NIR) light into higher energy photons, including UV.

Purpose of the Study:

  • To develop a photoresponsive supramolecular hydrogel system activated by NIR light.
  • To replace direct UV excitation with a safer and more versatile NIR-triggered mechanism.
  • To integrate UCNPs with an azobenzene-based hydrogel for remote control of gel-sol transitions.

Main Methods:

  • Fabrication of a supramolecular hydrogel using azobenzene-modified poly(acrylic acid) and deoxycholate-β-cyclodextrin.
  • Incorporation of LiYF4:Tm3+/Yb3+ upconverting nanoparticles into the hydrogel matrix.
  • Irradiation of the hydrogel system with 980 nm NIR light to induce gel-sol transition.
  • Monitoring the transition kinetics and comparing with a control sample without UCNPs.

Main Results:

  • The modified hydrogel exhibited a complete gel-sol transition within 60 minutes upon 980 nm NIR irradiation.
  • The upconverting nanoparticles successfully converted NIR light into UV light, triggering the azobenzene moiety.
  • A control sample without UCNPs showed no significant change under identical NIR irradiation conditions.
  • The system demonstrated efficient and reversible photoresponsive behavior.

Conclusions:

  • NIR-triggered upconversion provides an effective alternative to direct UV excitation for supramolecular hydrogel actuation.
  • This approach enhances the safety and applicability of photoresponsive hydrogels in biological and other sensitive environments.
  • The developed system shows promise for applications requiring remote and non-invasive control of material properties.