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Title

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

AuthorsGordeyeva, Korneliya S.; Fall, Andreas B.; Hall, Stephan; Wicklein, Bernd ; Bergström, Lennart
KeywordsMultivalent-ion
Nanocellulose
Surfactant
Foams
Strength
X-ray tomography
Gelation
Issue Date15-Jun-2016
PublisherElsevier
CitationJournal of Colloid and Interface Science 472: 44-51 (2016)
AbstractAggregation 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 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 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 is significantly higher than commercially available polyurethane foams used for thermal insulation.
Publisher version (URL)https://doi.org/10.1016/j.jcis.2016.03.031
URIhttp://hdl.handle.net/10261/186311
Identifiersdoi: 10.1016/j.jcis.2016.03.031
e-issn: 1095-7103
issn: 0001-8686
Appears in Collections:(ICMM) Artículos
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