Study On Stabilization Of Nonaqueous Foam By Nano-Silica

This article is mainly to control the particle size and degree of hydrophobicity to prepare nano-SiO₂ particles,and then to explore its foaming performance and foam stability in non-aqueous solution.In this paper,different non-aqueous solvents were selected for foaming experiments.Through experimental analysis,the following conclusions are reached:1.In the preparation of nano-SiO₂ particles,the effects of reaction time,temperature and the amount of ammonia added on the particle size were studied.It was found that with the addition of 1 mL of ammonia,a reaction time of 8 h,and a reaction temperature of 35°C,the particle size is 29.92 nm.2.The effects of the amount of dichlorodimethylsilane and the reaction time on the hydrophobicity of the nano-SiO₂ particles were studied,it was found that when the dichlorodimethylsilane was 10%,the reaction time was 16 h,the reaction temperature was50°C,and the aging time was 24 h,the maximum contact angle of particles is 155°.3.Modified nano-SiO₂ particles with different contact angles and mass fractions were added in different non-aqueous solvents for foaming,and the gas content was 1.32%to18.48%.It can be concluded that only nano-SiO₂ particles are used for foaming in the solvent,the foam volume is small,and the gas content is low and as the amount of nanoparticles added increases,foam stability increases accordingly.4.By adding modified nano-SiO₂ particles with different non-aqueous solvents,it is obvious that the particles are precipitated in the lower layer of the solvent,but the solvent can foam and the degree of the particles required during foaming ranges from 38.3°to 96.9°.5.The surface tension of modified nano-SiO₂ particles with different degrees of hydrophobicity and mass fractions was measured in different non-aqueous solvents.It was found that the added nano-SiO₂ particles had no effect on the surface tension of the non-aqueous solvent,and the foam produced was very stable.The greater the surface tension,the greater the contact angle of the particles that can foam.