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Gordeyeva KS, Fall AB, Hall S, et al. Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation. J Colloid Interface Sci. 2016;472:44-51doi: 10.1016/j.jcis.2016.03.031.
Gordeyeva, K. S., Fall, A. B., Hall, S., Wicklein, B., & Bergström, L. (2016). Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation. Journal of colloid and interface science, 47244-51. https://doi.org/10.1016/j.jcis.2016.03.031
Gordeyeva, Korneliya S, et al. "Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation." Journal of colloid and interface science vol. 472 (2016): 44-51. doi: https://doi.org/10.1016/j.jcis.2016.03.031
Gordeyeva KS, Fall AB, Hall S, Wicklein B, Bergström L. Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation. J Colloid Interface Sci. 2016 Jun 15;472:44-51. doi: 10.1016/j.jcis.2016.03.031. Epub 2016 Mar 17. PMID: 27003498.
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J Colloid Interface Sci. 2016 Jun 15;472:44-51. doi: 10.1016/j.jcis.2016.03.031. Epub 2016 Mar 17.

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

Journal of colloid and interface science

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

Affiliations

  1. Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden. Electronic address: [email protected].
  2. Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden. Electronic address: [email protected].
  3. Division of Solid Mechanics, Lund University, Lund 22100, Sweden. Electronic address: [email protected].
  4. Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden. Electronic address: [email protected].
  5. Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden. Electronic address: [email protected].

PMID: 27003498 DOI: 10.1016/j.jcis.2016.03.031

Abstract

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/m(3) is significantly higher than commercially available polyurethane foams used for thermal insulation.

Copyright © 2016 Elsevier Inc. All rights reserved.

Keywords: Foams; Gelation; Multivalent-ion; Nanocellulose; Strength; Surfactant; X-ray tomography

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