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Local Crystallinity in Twisted Cellulose Nanofibers.

Tom Willhammar1, Kazuho Daicho2, Duncan N Johnstone3

  • 1Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.

ACS Nano
|January 19, 2021
PubMed
Summary

Researchers measured local polysaccharide chain arrangement in cellulose nanofibers using scanning electron diffraction. This reveals insights into nanofiber twisting and properties, aiding cellulose processing optimization.

Keywords:
CNFTEMcellulosediffractionelectron diffractionnanofiber

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Area of Science:

  • Biomaterials Science
  • Materials Science
  • Nanotechnology

Background:

  • Cellulose nanocrystals exhibit helical superstructures with unique mechanical and optical properties.
  • Polysaccharide chain ordering within nanocrystals dictates these properties but is typically measured in bulk average.
  • Direct measurement of local chain arrangement in cellulose nanofibers has been a significant challenge.

Purpose of the Study:

  • To probe the local packing of polysaccharide chains within cellulose nanofibers.
  • To reveal the local ordering of chains in twisting sections of nanofibers.
  • To understand the size dependence of cellulose nanofiber twisting.

Main Methods:

  • Utilized scanning electron diffraction (SED) to analyze polysaccharide chain packing.
  • Employed atomic force microscopy (AFM) to investigate nanofiber twisting dynamics.
  • Correlated structural ordering with mechanical and optical properties.

Main Results:

  • Directly measured local polysaccharide chain arrangement across cellulose nanofibers.
  • Revealed local ordering of polysaccharide chains in twisting regions of nanofibers.
  • Demonstrated the size dependence of the driving force for cellulose nanofiber twisting.

Conclusions:

  • Direct measurement of crystalline twisted regions in cellulose nanofibers provides critical insights into single-fibril properties.
  • Understanding local chain arrangement influences inter-nanocrystal interactions in dense assemblies.
  • This knowledge can optimize cellulose extraction and separation processes.