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

Gordeyeva, Korneliya S.; Fall, Andreas B.; Hall, Stephen LU ; Wicklein, Bernd and Bergström, Lennart (2016) In Journal of Colloid and Interface Science 472. p.44-51
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Foams, Gelation, Multivalent-ion, Nanocellulose, Strength, Surfactant, X-ray tomography
in
Journal of Colloid and Interface Science
volume
472
pages
8 pages
publisher
Elsevier
external identifiers
  • Scopus:84961204163
  • WOS:000374620600005
ISSN
0021-9797
DOI
10.1016/j.jcis.2016.03.031
language
English
LU publication?
yes
id
972bae1d-323b-4346-ae53-0b29d4b5a271
date added to LUP
2016-04-27 12:20:44
date last changed
2016-05-19 15:34:34
@misc{972bae1d-323b-4346-ae53-0b29d4b5a271,
  abstract     = {<p>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 CaCO<sub>3</sub> 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 CaCO<sub>3</sub> 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<sup>3</sup> is significantly higher than commercially available polyurethane foams used for thermal insulation.</p>},
  author       = {Gordeyeva, Korneliya S. and Fall, Andreas B. and Hall, Stephen and Wicklein, Bernd and Bergström, Lennart},
  issn         = {0021-9797},
  keyword      = {Foams,Gelation,Multivalent-ion,Nanocellulose,Strength,Surfactant,X-ray tomography},
  language     = {eng},
  month        = {06},
  pages        = {44--51},
  publisher    = {ARRAY(0x95f1788)},
  series       = {Journal of Colloid and Interface Science},
  title        = {Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation},
  url          = {http://dx.doi.org/10.1016/j.jcis.2016.03.031},
  volume       = {472},
  year         = {2016},
}