关键词: 泡沫, 稳定性, 二氧化硅粒子, 疏水性, 拉伸

Abstract: The surface of commercial silicon dioxide particles was hydrophobically modified in this paper. The aqueous foams were prepared by stirring mixtures of dodecyl sulfate sodium (SDS) and particles before or after surface modification. The hydrophobicity of particles, the particle additions, the concentration of particles adsorbed on the air/water interface and the stability of dynamic stretching liquid film were investigated. Results shows that the foamability and foam stability of the hydrophilic silica/SDS dispersion is better than that of the modified silica particle/SDS dispersion. The foam stability increases with the increase of the particle addition and it reaches a maximum with the particle addition of 0.05 wt%. However, in dynamic stretching conditions, the liquid film can be stabilized by hydrophobically modified silica particles. The stretch length of liquid film reaches maximum at the particles addition of 0.05 wt%.

Key words: foam；foam stability, silicon dioxide particles, hydrophobicity, dynamic tensile