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Hazy transparent cellulose nanopaper scatters light due to compressed hollow cellulose fibers. This unique structure provides high thermal durability and low thermal expansion in the material.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Cellulose nanopapers are engineered from cellulose nanofibers derived from pulp fibers.
  • Optical properties like transmittance and haze are critical for transparent material applications.
  • Understanding light scattering mechanisms is key to controlling nanopaper appearance.

Purpose of the Study:

  • To elucidate the light scattering mechanism responsible for the hazy appearance of transparent cellulose nanopaper.
  • To differentiate the structural components contributing to optical properties in clear versus hazy nanopapers.
  • To correlate structural features with thermal properties of the developed cellulose nanopapers.

Main Methods:

  • Fabrication of cellulose nanopapers through varying degrees of nanofibrillation of pulp fibers.
  • Characterization of cellulose structures, distinguishing between solid nanofibers and hollow microsized fibers.
  • Measurement of optical properties, including total transmittance and haze values.
  • Evaluation of thermal properties such as thermal durability, thermal expansion, density, and crystallinity.

Main Results:

  • Clear nanopapers (fully nanofibrillated) exhibited high transmittance (89.3-91.5%) and low haze (4.9-11.7%).
  • Hazy nanopapers (partially nanofibrillated) showed similar transmittance (88.6-92.1%) but significantly higher haze (27.3-86.7%).
  • The haze in nanopapers is attributed to light scattering from compressed, hollow microsized cellulose fibers within the structure.
  • Hazy nanopapers demonstrated excellent thermal stability (295-305°C), low thermal expansion (8.5-10.6 ppm/K), high density (1.29-1.55 g/cm³), and high crystallinity (73-80%).

Conclusions:

  • The compressed hollow structure of microsized cellulose fibers is the primary cause of light scattering and haze in cellulose nanopapers.
  • Partial nanofibrillation, leading to the inclusion of these hollow fibers, creates a hazy transparent material.
  • The resulting hazy transparent cellulose nanopaper possesses desirable thermal properties, making it suitable for demanding applications.