Study on the drainage behavior of non-aqueous foams stabilized by nano-silica particles
Non-aqueous foams have a wide range of applications in petrochemical industry,food industry,daily chemical industry and biomedical industry.However,the low surface tension and low dielectric constant of non-aqueous solvents lead to the difficulty in forming stable foams.The unique advantages of nano-silica particles in foaming and foam stabilization are getting more and more attention.In this work,the surface wettability of 14 nm nano-silica particles was modified with dichlorodimethylsilane(DCDMS).The effects of wettability of these nano-silica particles on the drainage behaviors of several non-aqueous foams were studied.It was found that,with the increase of the polarity of non-aqueous solvents,the foaming performance showed a gradually increasing trend.The drainage process for non-aqueous foam could be divided into three stages:The initial stage,the middle stage,and the end stage.With the increase of the surface wettability of nano-silica particles,the half-life of foam was first increased and then decreased.The half-life of foams of highly polar solvents could reach 45 min,and the half-life of foams of moderately polar solvents could reach 60 min.Under optical microscope,it was observed that with drainage,the bubble size of foams gradually increased and the shape gradually became polygonal.
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