气相二氧化硅
流变学
皮克林乳液
相位反转
化学工程
疏水二氧化硅
材料科学
聚二甲基硅氧烷
相(物质)
乳状液
化学
复合材料
有机化学
膜
生物化学
工程类
作者
Frederico Macedo Fernandes Barros,Bruna Luíza Pelegrini,Christophe Chassenieux,Marli Miriam de Souza Lima,Lazhar Benyahia
标识
DOI:10.1016/j.colsurfa.2022.128801
摘要
We investigate the stability and the structure of Polydimethylsiloxane (PDMS)/water emulsions stabilized by a mixture of partially hydrophobic (Aerosil® R816) and hydrophilic silica particles (LUDOX TM 50). Transitional phase inversion from oil-in-water (O/W) to water-in-oil (W/O) is observed by changing the hydrophobic/hydrophilic particles ratio as well as the viscosity of the oil phase. A higher concentration of hydrophilic particles is needed to promote phase inversion for the less viscous oil. Adding gradually hydrophilic silica particles in the water phase leads to the decrease of the fraction of effective emulsified phase i.e. the dispersed phase and the increase of the droplet size which promotes the phase inversion. In addition, all these changes are accompanied by the decrease of the elastic moduli of the emulsions which may be correlated to their complex structure and the interactions of the two types of particles at the interface of the droplets.
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