Nanoparticle silica-stabilised oil-in-water emulsions: improving emulsion stability
Nanoparticle silica-stabilised oil-in-water emulsions: improving emulsion stability
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DOI：
10.1016/j.colsurfa.2004.10.116
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发表时间：
2005-02-01
影响因子：
5.2
通讯作者：
Whitby, CP
中科院分区：
文献类型：
--
作者：
Binks, BP;Whitby, CP
描述了由亲水性二氧化硅纳米颗粒的非极性油和碱性分散体单独制备的水包油（o/w）乳液的快速相分离。随后报道了颗粒表面化学以及油相和水相的类型和组成在提高这些乳液稳定性中的作用的研究。通过控制 pH 值和添加二价电解质来改变颗粒电荷和絮凝，可暂时改善乳液稳定性，而添加阳离子表面活性剂可制备稳定的乳液。发现增加油相极性可以提高乳液稳定性，这是由于极性溶剂分子吸附到二氧化硅表面改变了颗粒润湿性。通过向水相中添加非水溶剂来降低颗粒对水相的亲和力的尝试是不成功的，这可能是由于颗粒的极端亲水性。对于稳定的乳液，还研究了二氧化硅粒径对乳液液滴尺寸的影响。(C) 2004 Elsevier B.V. 保留所有权利。
The rapid phase separation of oil-in-water (o/w) emulsions prepared from non-polar oil and alkaline dispersions of hydrophilic silica nanoparticles alone is described. A study of the roles of the surface chemistry of the particles and the type and composition of the oil and aqueous phases in improving the stability of these emulsions is then reported. Alteration of the particle charge and flocculation by control of pH and addition of divalent electrolyte causes temporary improvements in emulsion stability, while the addition of cationic surfactant results in the preparation of stable emulsions. Increasing the oil phase polarity is found to improve emulsion stability and this is attributed to adsorption of polar solvent molecules to the silica surface changing the particle wettability. Attempts to reduce the affinity of the particles for the aqueous phase by adding non-aqueous solvents to that phase are unsuccessful, perhaps due to the extreme hydrophilicity of the particles. For the stable emulsions, the effect of silica particle size on the emulsion drop size is also investigated.(C) 2004 Elsevier B.V. All rights reserved.