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Foam stabilized by the mixture of silicone and hydrocarbon surfactants in the presence of nanoparticles with different specific surface area
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Foam stabilized by the mixture of silicone and hydrocarbon surfactants in the presence of nanoparticles with different specific surface area
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Journal Article
Foam stabilized by the mixture of silicone and hydrocarbon surfactants in the presence of nanoparticles with different specific surface area
2023
Overview
Nanoparticles (NPs) have tremendous potential for improving the stability of environmentally friendly fluorine-free firefighting foams. However, many properties of nanoparticle-stabilized foams are still unclear before application. In the present study, hydrophilic SiO
2
NPs with different specific surface area (SSA), a nonionic silicone surfactant (CoatOsil-77), and a zwitterionic hydrocarbon surfactant (BS-12) were chosen for preparing mixed dispersions in water to investigate the effect of NP SSA on fluorine-free foams. The interaction between NPs and surfactants in water, foaming ability, and foam stability of the mixed dispersions were systematically investigated. Results indicate that the conductivity and foaming ability of the mixed dispersions first decreased and then increased, whereas the dynamic viscosity and surface tension were just the reverse with increasing NP SSA. The presence of NPs with SSA of 300 or 400 m
2
/g enhanced foam stability of the mixed dispersions by delaying foam drainage and coarsening. The optimal SSA for NPs enhancing foam stability is 300 m
2
/g. The results of this study could provide theoretical guidance for the application of NPs in the development of environmentally friendly fluorine-free firefighting foams.
Graphical Abstract
Highlights
Molecular interactions between CoatOsil-77 and BS-12 are obviously affected by addition of NPs.
NPs with different SSA enhance foam stability by delaying foam drainage and coarsening.
Optimal SSA for NPs to enhance foam stability of silicone and hydrocarbon surfactants is 300 m
2
/g.
Publisher
Springer US,Springer Nature B.V
