Abstract
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.
Highlights
Hybrid structures comprising nanoscale cellulosic materials and inorganic minerals are an important material combination for diversity of applications varying from, for example, biomedical devices to renewable packaging materials and fire-retardant nanocomposites [1,2,3,4,5,6]
The unique properties of cellulose nanofibrils (CNF) such as high aspect ratio, large interfacial area, excellent hydrogen bonding and gel forming ability, coupled with high strength and amphiphilic character, make them an auspicious candidate to be exploited in many technical applications [12] as well as building blocks in advanced materials [13]
Transmission data were collected at pH levels of 8 and 8.5 and ionic strength levels of 5 mM and 10 mM to reveal how sensitive the system was towards surface electrostatic-induced changes
Summary
Hybrid structures comprising nanoscale cellulosic materials and inorganic minerals are an important material combination for diversity of applications varying from, for example, biomedical devices to renewable packaging materials and fire-retardant nanocomposites [1,2,3,4,5,6]. The bionanomaterial architectures with high porosity and large surface area combined with renewable and sustainable material attributes have gained increasing interest to be used, amongst other things, as high efficiency air filters and as substrates for biocatalytic conversion [7,8]. The unique properties of cellulose nanofibrils (CNF) such as high aspect ratio, large interfacial area, excellent hydrogen bonding and gel forming ability, coupled with high strength and amphiphilic character, make them an auspicious candidate to be exploited in many technical applications [12] as well as building blocks in advanced materials [13]
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