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Article

Enhancing the Stability of Aqueous Dispersions and Foams Comprising Cellulose Nanofibrils (CNF) with CaCO3 Particles

1
VTT Technical Research Centre of Finland Ltd., P.O. Box 1000, FI-02044 VTT Espoo, Finland
2
Omya International AG, Baslerstrase 42, CH-4665 Otringen, Switzerland
3
FiberLean Technologies, Par Moor Centre, Par Moor Road, Par, Cornwall PL24 2SQ, UK
4
Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Aalto, Helsinki, Finland
*
Authors to whom correspondence should be addressed.
Current Address: Kemira Oyj, Luoteisrinne 2, P.O. Box 44, FI-02271 Espoo, Finland.
Nanomaterials 2018, 8(9), 651; https://doi.org/10.3390/nano8090651
Received: 9 July 2018 / Revised: 6 August 2018 / Accepted: 14 August 2018 / Published: 23 August 2018
(This article belongs to the Special Issue Cellulose Nanomaterials)
In this work, stability of dispersions and foams containing CaCO3-based pigments and cellulose nanofibrils (CNF) was evaluated with the aim to reveal the mechanisms contributing to the overall stability of the selected systems. The utmost interest lies in the recently developed hydrocolloid hybrid CaCO3 pigments and their potential to form bionanocomposite structures when incorporated with CNF. These pigments possess a polyelectrolyte layer deposited on the surface of the particle which is expected to enhance the compatibility between inorganic and organic components. Stability assessment of both dispersions and foams was conducted using turbidity profile scanning. In dispersions, CNF provides stability due to its ability to form a firm percolation network. If surface-modified pigments are introduced, the favourable surface interactions between the pigments and CNF positively influence the stability behaviour and even large macro-size pigments do not interfere with the stability of either dispersions or foams. In foams, the stability can be enhanced due to the synergistic actions brought by CNF and particles with suitable size, shape and wetting characteristics resulting in a condition where the stability mechanism is defined by the formation of a continuous plateau border incorporating a CNF network which is able to trap the inorganic particles uniformly. View Full-Text
Keywords: cellulose nanofibrils (CNF); hybrid hydrocolloid pigments; percolation network; dispersion stability; cellulose-based foam; plateau border stability in aqueous foams; inorganic-organic hybrid materials; nanocellulose-CaCO3 containing foams; stability enhancement of foams cellulose nanofibrils (CNF); hybrid hydrocolloid pigments; percolation network; dispersion stability; cellulose-based foam; plateau border stability in aqueous foams; inorganic-organic hybrid materials; nanocellulose-CaCO3 containing foams; stability enhancement of foams
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MDPI and ACS Style

Tenhunen, T.-M.; Pöhler, T.; Kokko, A.; Orelma, H.; Schenker, M.; Gane, P.; Tammelin, T. Enhancing the Stability of Aqueous Dispersions and Foams Comprising Cellulose Nanofibrils (CNF) with CaCO3 Particles. Nanomaterials 2018, 8, 651. https://doi.org/10.3390/nano8090651

AMA Style

Tenhunen T-M, Pöhler T, Kokko A, Orelma H, Schenker M, Gane P, Tammelin T. Enhancing the Stability of Aqueous Dispersions and Foams Comprising Cellulose Nanofibrils (CNF) with CaCO3 Particles. Nanomaterials. 2018; 8(9):651. https://doi.org/10.3390/nano8090651

Chicago/Turabian Style

Tenhunen, Tiia-Maria; Pöhler, Tiina; Kokko, Annaleena; Orelma, Hannes; Schenker, Michel; Gane, Patrick; Tammelin, Tekla. 2018. "Enhancing the Stability of Aqueous Dispersions and Foams Comprising Cellulose Nanofibrils (CNF) with CaCO3 Particles" Nanomaterials 8, no. 9: 651. https://doi.org/10.3390/nano8090651

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