Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation
(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.
(Less)
- author
- Gordeyeva, Korneliya S. ; Fall, Andreas B. ; Hall, Stephen LU ; Wicklein, Bernd and Bergström, Lennart
- organization
- publishing date
- 2016-06-15
- 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
- pmid:27003498
- 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
- 2024-06-15 05:53:40
@article{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}},
keywords = {{Foams; Gelation; Multivalent-ion; Nanocellulose; Strength; Surfactant; X-ray tomography}},
language = {{eng}},
month = {{06}},
pages = {{44--51}},
publisher = {{Elsevier}},
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}},
doi = {{10.1016/j.jcis.2016.03.031}},
volume = {{472}},
year = {{2016}},
}