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Stabilizing nanocellulose-nonionic surfactant composite foams by delayed Ca-induced gelation
Stockholm University, Sweden.ORCID iD: 0000-0002-9816-5270
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2016 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 472, p. 44-51Article 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 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.

Place, publisher, year, edition, pages
Academic Press Inc. , 2016. Vol. 472, p. 44-51
Keywords [en]
Bubble columns; Calcium; Calcium carbonate; Cellulose; Drying; Gelation; Imaging systems; Nanoparticles; Nonionic surfactants; Reinforcement; Surface active agents; Thermal insulation; Tomography, Bubble size distributions; Long term stability; Nano-cellulose; Percolated network; Reinforced composites; Rod-like particles; Strength; X-ray tomography, Foams, calcium carbonate; gluconic acid; nanoparticle; nonionic surfactant; oxidized cellulose; poloxamer; polyurethan foam, Article; compression; density; dissolution; flow kinetics; foam; gelation; priority journal; scanning electron microscopy; strength; volumetry; Young modulus, Foam; Gelation; Surfactants
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-68234DOI: 10.1016/j.jcis.2016.03.031Scopus ID: 2-s2.0-84961204163OAI: oai:DiVA.org:ri-68234DiVA, id: diva2:1817434
Available from: 2023-12-06 Created: 2023-12-06 Last updated: 2023-12-06Bibliographically approved

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Fall, Andreas

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