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Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation

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Author

  • Korneliya S. Gordeyeva
  • Andreas B. Fall
  • Stephen Hall
  • Bernd Wicklein
  • Lennart Bergström

Summary, in English

Aggregation of dispersed rod-like particles like nanocellulose can improve the strength and rigidity of percolated networks but may also have a detrimental effect on the foamability. However, it should be possible to improve the strength of nanocellulose foams by multivalent ion-induced aggregation if the aggregation occurs after the foam has been formed. Lightweight and highly porous foams based on TEMPO-mediated oxidized cellulose nanofibrils (CNF) were formulated with the addition of a non-ionic surfactant, pluronic P123, and CaCO3 nanoparticles. Foam volume measurements show that addition of the non-ionic surfactant generates wet CNF/P123 foams with a high foamability. Foam bubble size studies show that delayed Ca-induced aggregation of CNF by gluconic acid-triggered dissolution of the CaCO3 nanoparticles significantly improves the long-term stability of the wet composite foams. Drying the Ca-reinforced foam at 60 °C results in a moderate shrinkage and electron microscopy and X-ray tomography studies show that the pores became slightly oblate after drying but the overall microstructure and pore/foam bubble size distribution is preserved after drying. The elastic modulus (0.9-1.4 MPa) of Ca-reinforced composite foams with a density of 9-15 kg/m3 is significantly higher than commercially available polyurethane foams used for thermal insulation.

Department/s

Publishing year

2016-06-15

Language

English

Pages

44-51

Publication/Series

Journal of Colloid and Interface Science

Volume

472

Document type

Journal article

Publisher

Elsevier

Topic

  • Materials Chemistry

Keywords

  • Foams
  • Gelation
  • Multivalent-ion
  • Nanocellulose
  • Strength
  • Surfactant
  • X-ray tomography

Status

Published

ISBN/ISSN/Other

  • ISSN: 0021-9797