Factors that affect Pickering emulsions stabilized by mesoporous hollow silica microspheres

皮克林乳液 乳状液 润湿 化学工程 材料科学 介孔材料 粒子(生态学) 吸附 粒径 介孔二氧化硅 纳米技术 化学 复合材料 有机化学 催化作用 工程类 地质学 海洋学
作者
Yuanxia Zhang,Yan Bao,Wenbo Zhang,Ru Xiang
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:633: 1012-1021 被引量:35
标识
DOI:10.1016/j.jcis.2022.12.009
摘要

Classical (solid particles stabilized) Pickering emulsions have been widely studied due to the irreversible adsorption of solid particles at the oil-water interface. Mesoporous hollow silica microspheres (MHSMs) are promising stabilizers for Pickering emulsion owing to its larger specific surface area and lower apparent density. However, this type of Pickering emulsion has not attracted enough attention. The stabilization mechanism of Pickering emulsion by MHSMs has not been studied in detail yet.Herein, stable Pickering emulsions were prepared using only MHSMs as stabilizers. In order to investigate its stabilization mechanism, the effect factors of size, shell thickness, wettability and concentration of MHSMs, and oil/water ratio on the stability of Pickering emulsions were analyzed deeply.As a result, the stability of Pickering emulsion can be improved by MHSMs with smaller particle size and shell thickness. Also, MHSMs with the intermediate hydrophobicity and suitable oil/water ratio actually do favour for the stability of Pickering emulsion. As expected, the stability of Pickering emulsion can be enhanced by increasing the concentration of MHSMs in a certain range. The Pickering emulsions tend to achieve excellent stable state when the concentration of MHSMs is 1.25 mg/mL. All those results suggested that the stability of Pickering emulsions correlates directly to particle size, shell thickness, wettability and concentration of MHSMs, and oil/water ratio. This research paves a way for the fabrication of functional materials via Pickering emulsions.
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