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.

我们研究了由部分疏水性 (Aerosil® R816) 和亲水性二氧化硅颗粒 (LUDOX TM 50) 的混合物稳定的聚二甲基硅氧烷 (PDMS)/水乳液的稳定性和结构。通过改变疏水/亲水颗粒比以及油相的粘度，可以观察到从水包油（O/W）到油包水（W/O）的转变相。需要更高浓度的亲水颗粒来促进粘度较低的油的相转化。在水相中逐渐加入亲水性二氧化硅颗粒会导致有效乳化相（即分散相）的比例降低，液滴尺寸增大，从而促进相转化。此外，