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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biotechnology

Background:

  • Stimuli-responsive nanocontainers are crucial for applications like targeted drug delivery and controlling cellular behavior.
  • Developing systems for controlled release and light upconversion remains a significant challenge.

Purpose of the Study:

  • To design and characterize novel polyelectrolyte (PE) nanocontainers on mesoporous titania particles with silver (Ag) nanoparticles.
  • To achieve chemical light upconversion and controlled release of l-arabinose for bacteria luminescence switching.

Main Methods:

  • Surface modification of mesoporous titania particles with Ag nanoparticles.
  • Deposition of a polyelectrolyte shell to form hybrid TiO2/Ag/PE nanocontainers.
  • Activation using 980 nm (IR) illumination to trigger l-arabinose release and monitor bacteria fluorescence at 510 nm.

Main Results:

  • The hybrid TiO2/Ag/PE containers exhibited a 10-fold increase in l-arabinose release rate upon IR illumination compared to non-activated containers.
  • The released l-arabinose effectively switched bacteria fluorescence, demonstrating a controllable luminescence response.
  • The PE shell controlled the kinetics of l-arabinose release and luminescence switching.

Conclusions:

  • The developed hybrid nanocontainers offer a promising platform for light-controlled release and luminescence switching.
  • This approach enables targeted and delayed activation for diverse applications requiring light upconversion.
  • The study highlights the potential of TiO2/Ag/PE systems in advanced bio-integrated technologies.