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Synthesis Method for Cellulose Nanofiber Biotemplated Palladium Composite Aerogels
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Cellulose nanofiber board.

Hossein Yousefi1, Sona Azad1, Mahdi Mashkour1

  • 1Laboratory of Sustainable Nanomaterials, Department of Wood Engineering and Technology, Gorgan University of Agricultural Sciences and Natural Resources, 4913815739, Gorgan, Iran.

Carbohydrate Polymers
|March 1, 2018
PubMed
Summary

Cellulose nanofiber boards (CNF-boards) were fabricated without additives, showing remarkable strength and dimensional stability. These novel CNF-boards offer superior performance compared to traditional wood composites and steel.

Keywords:
BoardCellulose nanofiberDimensional recoveryFlexural strengthSelf-densification

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Composite Materials

Background:

  • Cellulose-based materials are sustainable alternatives to conventional composites.
  • Developing high-performance cellulose materials requires innovative fabrication techniques.
  • Existing cellulose fiber boards (CF-boards) have limitations in strength and dimensional stability.

Purpose of the Study:

  • To fabricate adhesive-free cellulose nanofiber boards (CNF-boards).
  • To evaluate the mechanical properties and dimensional stability of CNF-boards.
  • To compare CNF-boards with cellulose fiber boards (CF-boards) and other materials.

Main Methods:

  • Fabrication of CNF-boards and CF-boards.
  • Utilizing a novel cold pre-press apparatus for dewatering CNF gel.
  • Drying CNF-boards under mild conditions (70°C, 0.005 MPa) leveraging self-densification.
  • Testing water-activated dimensional recovery, flexural strength, and tensile strength.

Main Results:

  • CNF-boards achieved a density of 1.3 g/cm³ under mild drying conditions.
  • CNF-boards exhibited high water-activated dimensional recovery (96%) over five wetting-drying cycles.
  • Flexural strength (162 MPa) and tensile strength (85 MPa) of CNF-boards significantly exceeded those of CF-boards (28 MPa and 11 MPa, respectively).
  • Specific strengths of CNF-boards surpassed those of wood-based composites, polymers, and ASTM A36 steel.

Conclusions:

  • Adhesive-free CNF-boards can be fabricated with excellent mechanical properties and dimensional stability.
  • The self-densification capability of CNF enables high performance under mild processing conditions.
  • CNF-boards represent a promising advanced material with superior specific strength compared to various conventional materials.