Effects of solid particle content on properties of o/w Pickering emulsions

被引:303
作者
Frelichowska, Justyna [1 ]
Bolzinger, Marie-Alexandrine [1 ]
Chevalier, Yves [1 ]
机构
[1] Univ Lyon 1, CNRS, UMR 5007, Lab Automat & Genie Procedes, F-69622 Villeurbanne, France
关键词
Emulsions; Pickering emulsions; Silica; Particle size distribution; Granulometry; DROPLET-WATER INTERFACE; IN-OIL EMULSIONS; AQUEOUS-PHASE COMPOSITION; STABILIZED EMULSIONS; MINIEMULSION POLYMERIZATION; SILICA NANOPARTICLES; COLLOIDAL PARTICLES; HYDROPHOBIC SILICA; DOUBLE HYDROXIDES; FUMED SILICA;
D O I
10.1016/j.jcis.2010.08.019
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The control of droplet size and stability of oil-in-water Pickering emulsions stabilized by hydrophobized fumed silica was investigated. Three regimes were observed according to the silica content: instability at low silica content, stable emulsions with droplet size controlled by the silica content, and emulsions of constant size set by the emulsification process at high silica concentrations. The oil-to-silica ratio was the relevant parameter of the size control in the medium concentration regime. Centrifugation experiments and particle size distribution measurements gave evidence of the presence of excess silica present as dispersion in the aqueous phase in the high silica content regime. Adsorption of silica to the droplet surface did not follow adsorption equilibrium; strong adsorption prevailed. Lastly, aggregation of silica particles appeared a crucial parameter. Oil adsorption and capillary condensation of oil within the silica aggregates provided a supplementary mechanism of silica aggregation that contributed to the stability of emulsions. (C) 2010 Elsevier Inc. All rights reserved.
引用
收藏
页码:348 / 356
页数:9
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