关键词: 两亲颗粒;SiO2纳米颗粒;Pickering乳液;界面活性;泡沫性能

Abstract: Amphiphilic silica nanoparticles have been synthesized from silylated silica nanoparticles by Pickering emulsions method.The foam properties and self -assembly behavior of the amphiphilic silica nanoparticles at the air-water interface was investigated .The chemical composition, size distribution, interfacial activity, surface morphology and foam properties were characterized by Fourier transform infrared spectroscope (FTIR), particle size analyzer, surface tension meter, scanning electron microscopy (SEM) and foamscan.The results showed that the average particle size of the monodisperse silica nanoparticles prepared by St?ber method was 104 nm. The silica nanoparticles which modified by 3-aminopropyltriethoxysilane (APTES), pack more closely and in a more ordered fashion on the wax surface , improving the efficiency of modification .When the amphiphilic silica nanoparticles concentration reached 0.6％, the adsorption of the particles at the interface was saturated and the equilibrium surface tension would drop to 32.7 mN/m.The test results of foam properties showed that Janus particles effectively controlled coalescence , disproportionation and drainage , and the foam showed excellent stability .

Key words: amphiphilic particles;silica nanoparticles;Pickering emulsions;interfacial activity;foam property