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Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 5
2016 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 472, 44-51 p.Article in journal (Refereed) Published
Abstract [en]

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 nonionic 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 degrees 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.

Place, publisher, year, edition, pages
2016. Vol. 472, 44-51 p.
Keyword [en]
Nanocellulose, Foams, Surfactant, Gelation, Multivalent-ion, Strength, X-ray tomography
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-130629DOI: 10.1016/j.jcis.2016.03.031ISI: 000374620600005PubMedID: 27003498OAI: oai:DiVA.org:su-130629DiVA: diva2:933115
Available from: 2016-06-03 Created: 2016-05-27 Last updated: 2016-06-03Bibliographically approved

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Gordeyeva, Korneliya S.Fall, Andreas B.Bergström, Lennart
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Department of Materials and Environmental Chemistry (MMK)
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