Foams stabilized by nanoparticles (NPs) and surfactants have a great research potential in developing environmentally friendly firefighting foams. In the present study, Foam dispersions containing silica NPs, hydrocarbon surfactant (CAD-40), and fluorocarbon surfactant (FS-50) are prepared for investigating the effect of NPs on thermal stability of firefighting foams. The molecular interaction, foaming ability, and foam thermal stability of the CAD-40/FS-50/NPs dispersions are studied. Results indicate that the molecular interactions result in increase following a decrease in surface activity, rapid increase in viscosity, and decrease in conductivity and foaming ability of the dispersions with increasing NP concentration. Foam volume decay, drainage, and coarsening of the dispersions under heat were apparently decelerated upon NP concentration above 1%. The hydrophobic aggregates generated by adsorption of surfactants on NP surface enhanced the foam thermal stability. This study can provide theoretical guidance for application of NPs in firefighting foams.

由纳米颗粒（NPs）和表面活性剂稳定的泡沫在开发环保型消防泡沫方面具有巨大的研究潜力。在本研究中，制备了含有二氧化硅纳米粒子、烃类表面活性剂 (CAD-40) 和氟碳表面活性剂 (FS-50) 的泡沫分散体，用于研究纳米粒子对消防泡沫热稳定性的影响。研究了 CAD-40/FS-50/NPs 分散体的分子相互作用、发泡能力和泡沫热稳定性。结果表明，随着纳米粒子浓度的增加，表面活性降低，粘度迅速增加，分散体的电导率和起泡能力降低，分子相互作用增加。泡沫体积衰减、排水、当 NP 浓度高于 1% 时，分散体在加热下的粗化和粗化明显减慢。表面活性剂吸附在纳米颗粒表面产生的疏水聚集体增强了泡沫的热稳定性。该研究可为NPs在消防泡沫中的应用提供理论指导。