Enhancing the stability of aqueous dispersions and foams comprising cellulose nanofibrils (CNF) with CaCo₃ particles

TY - JOUR

T1 - Enhancing the stability of aqueous dispersions and foams comprising cellulose nanofibrils (CNF) with CaCo3 particles

AU - Tenhunen, Tiia Maria

AU - Pöhler, Tiina

AU - Kokko, Annaleena

AU - Orelma, Hannes

AU - Gane, Patrick

AU - Schenker, Michel

AU - Tammelin, Tekla

PY - 2018/9/1

Y1 - 2018/9/1

N2 - 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.

AB - 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.

KW - Cellulose nanofibrils (CNF)

KW - Cellulose-based foam

KW - Dispersion stability

KW - Hybrid hydrocolloid pigments

KW - Inorganic-organic hybrid materials

KW - Nanocellulose-CaCo containing foams

KW - Percolation network

KW - Plateau border stability in aqueous foams

KW - Stability enhancement of foams

UR - http://www.scopus.com/inward/record.url?scp=85052623100&partnerID=8YFLogxK

U2 - 10.3390/nano8090651

DO - 10.3390/nano8090651

M3 - Article

VL - 8

JO - Nanomaterials

JF - Nanomaterials

SN - 2079-4991

IS - 9

M1 - 651

ER -