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Cellulose modified to host functionalities via facile cation exchange approach.

Panagiotis Spiliopoulos1, Saül Llàcer Navarro1, Eliott Orzan2

  • 1Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden; Wallenberg Wood Science Center (WWSC), Chalmers University of Technology, Gothenburg, Sweden.

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Functionalizing cellulose nanocrystals (CNCs) via counter-cation exchange offers a novel route to modify material properties. This study demonstrates the successful introduction of lanthanide ions, tuning CNCs for diverse applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Cellulose properties are typically modified using organic chemistry.
  • Ion-exchange is an established method for cellulose modification but is underexplored beyond sodium ions.
  • Previous work established cation exchange for alkali metal cations in cellulose.

Purpose of the Study:

  • To develop a facile method for functionalizing cellulose nanocrystals (CNCs) using functional group counter-cation exchange.
  • To explore the introduction and impact of trivalent lanthanide cations on CNC properties.
  • To demonstrate the potential of cation exchange for tailoring cellulose-based materials.

Main Methods:

  • Utilized counter-cation exchange to introduce trivalent lanthanide ions (Eu3+, Dy3+, Gd3+) into sulfate-half ester functionalized CNCs.
  • Employed compositional analysis to determine the coordination percentages of lanthanide ions by sulfate groups.
  • Characterized the resulting functionalized CNCs for optical and magnetic properties.

Main Results:

  • Eu3+ ions fully saturated the sulfate groups, resulting in red-emitting CNCs.
  • Gd3+ and Dy3+ ions showed partial coordination (82% and 41%, respectively).
  • Gd3+-functionalized CNCs exhibited altered magnetic relaxation times, while Dy3+-functionalized CNCs showed no optical functionality.

Conclusions:

  • Counter-cation exchange is a viable and versatile strategy for functionalizing cellulose nanocrystals with lanthanides.
  • The choice of lanthanide cation significantly influences the resulting material properties, including optical and magnetic characteristics.
  • This approach offers a promising pathway for modifying abundant cellulose resources for advanced applications in a sustainable future.