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Using a chitosan nanolayer as an efficient pH buffer to protect pH-sensitive supramolecular assemblies.

D V Andreeva1, A Kollath, N Brezhneva

  • 1Center for Soft and Living Matter, Institute of basic science, Ulsan National Institute of Science and Technology, 44919 Ulsan, Republic of Korea.

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Chitosan nanolayers protect pH-sensitive supramolecular polymers from disassembly caused by light-induced proton generation. This pH-responsive layer preserves material integrity under irradiation, demonstrating chitosan

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Controlling macro-object and film properties using nanolayer composites is desirable.
  • Layer-by-Layer (LbL) coating offers nanoarchitectured composite fabrication.
  • Supramolecular polymers are sensitive to pH changes, leading to disassembly.

Purpose of the Study:

  • To investigate the use of chitosan as a surface-based pH buffer.
  • To protect adsorbed supramolecular fibers from pH-mediated disassembly.
  • To assess chitosan's efficacy in preventing photodegradation of pH-sensitive materials.

Main Methods:

  • Fabrication of nanoarchitectured Layer-by-Layer (LbL) coatings.
  • Utilizing chitosan as a surface-based pH buffer layer.
  • Irradiation of a titania surface at 405 nm to generate protons and induce pH changes.

Main Results:

  • Proton generation on the titania surface under 405 nm illumination caused significant pH changes.
  • Supramolecular polymers coated with a chitosan nanolayer did not disassemble after irradiation.
  • Chitosan effectively mitigated the pH changes induced by light.

Conclusions:

  • Chitosan acts as an efficient pH-responsive protective layer for pH-sensitive soft materials.
  • This approach preserves the integrity of supramolecular polymers under light-induced pH variations.
  • Chitosan nanolayers offer a viable strategy for stabilizing delicate nanomaterials.