Rheological properties of highly stable foams co-stabilized by nanoparticles and xanthan gum or guar gum

Highly stable foams co-stabilized by nanoparticles (NPs) and biopolymer have good foaming ability and foam stability, which ensures the reliability and efficiency of the foam during the fire extinguishing process. It is worth noting that the addition of NPs and biopolymers significantly affects the flow characteristics of the foam in the pipeline and its structural stability, which play a key role in the fire extinguishing process. Therefore, it is very important to understand the effect of the addition of different types of biopolymers on the rheological properties of nano-stabilized foams. In this paper, the effects of the two biomacromolecular polymers, xanthan gum (XG) and guar gum (GG), on rheological properties of highly stable foams of FS-50/APG-0810/nano-β-Al₂O₃ were investigated. The results showed that the stability and viscoelasticity of mixed dispersions in the presence of both NPs and biopolymer were significantly higher than in the presence of NPs alone. Compared with XG, GG exhibited better foam stability, flow behavior, and viscoelasticity when interacting with NPs, and the corresponding foam formed has a higher capacity of shear resistance. This study can provide theoretical support for the development of firefighting foam with NPs and biopolymer stability.