Effect of electrolyte in silicone oil-in-water emulsions stabilised by fumed silica particles

被引：124
作者：
Horozov, Tommy S. [1 ]
Binks, Bernard P.
Gottschalk-Gaudig, Torsten
机构：
[1] Univ Hull, Surfactant & Colloid Grp, Dept Chem, Kingston Upon Hull HU6 7RX, N Humberside, England
[2] Wacker Chem GmbH, D-84489 Burghausen, Germany
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2007年 / 9卷 / 48期
关键词：
D O I：
10.1039/b709807n
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：
Partially hydrophobised fumed silica particles are used to make silicone oil-in-water emulsions at natural pH of the aqueous phase. The stability and rheological properties of the emulsions and suspensions are studied at NaCl concentrations in the range 0-100 mM. It is found that all emulsions are very stable to coalescence irrespective of the NaCl concentration. However, a strong effect of electrolyte on the creaming and rheological properties is observed and linked to the particle interactions in aqueous suspensions. The creaming rate and extent are large at low electrolyte concentrations but both abruptly decrease at salt concentrations exceeding the critical. occulation concentration of the suspension (similar to 1 mM NaCl). The drastic improvement of the stability to creaming is attributed to the formation of a visco-elastic three-dimensional network of interconnected particles and emulsion droplets.
引用
收藏
页码：6398 / 6404
页数：7
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