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Manipulating pH using near-infrared light assisted by upconverting nanoparticles.

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Near-infrared light remotely controls solution pH using upconverting nanoparticles and a ruthenium photobase. This method also triggers hydrogel swelling, demonstrating potential for advanced material applications.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • pH control is crucial in various chemical and biological processes.
  • Photocleavage offers remote and localized chemical modification.
  • Upconverting nanoparticles (UCNPs) enable near-infrared (NIR) light activation.

Purpose of the Study:

  • To demonstrate NIR light-triggered pH manipulation in aqueous solutions.
  • To integrate UCNPs and a photobase into a pH-responsive hydrogel.
  • To investigate NIR-induced hydrogel swelling.

Main Methods:

  • Utilized UCNPs for NIR light absorption and energy transfer.
  • Employed a ruthenium complex as a photobase activated by UCNPs.
  • Incorporated UCNPs and photobase into a pH-sensitive hydrogel matrix.

Main Results:

  • NIR irradiation induced photocleavage of the ruthenium complex, altering solution pH.
  • NIR irradiation of the hydrogel resulted in observable swelling.
  • Demonstrated localized pH changes and hydrogel actuation via NIR light.

Conclusions:

  • NIR light can precisely control pH in aqueous solutions using UCNP-assisted photocleavage.
  • The developed system shows promise for remote actuation of pH-responsive hydrogels.
  • This approach offers a non-invasive method for manipulating chemical environments and soft materials.