Department of Chemistry, Karl-Franzens-University Graz, Graz, Austria.
Langmuir. 2013 May 21;29(20):6004-12. doi: 10.1021/la4008685. Epub 2013 May 7.
Oil-water Pickering emulsions of about 200 nm were stabilized by nanosized hydrophilic silica after a simple surface treatment method. We have modified the aqueous silica nanoparticle dispersions by simple adsorption of oleic acid to their surfaces, improving the hydrophobicity of the particles while maintaining their charge and stability. The adsorption was monitored by small-angle X-ray scattering and electrophoretic measurements to estimate the interparticle interactions and surface charges. The effect of various parameters, such as nanoparticle concentration, amount of oleic acid, ionic strength, and pH, on the droplets' size and stability was investigated by dynamic light scattering. Furthermore, the ability of these modified silica nanoparticles to stabilize long-chain alkanes, liquid paraffin, and liquid-crystalline phases was examined.
经简单的表面处理方法，纳米级亲水性二氧化硅稳定了约 200nm 的油包水 Pickering 乳液。我们通过简单吸附油酸到其表面来修饰水性二氧化硅纳米颗粒分散体，在保持颗粒电荷和稳定性的同时，提高了颗粒的疏水性。通过小角 X 射线散射和电泳测量来监测吸附作用，以估计颗粒间的相互作用和表面电荷。通过动态光散射研究了各种参数，如纳米颗粒浓度、油酸用量、离子强度和 pH 值，对液滴大小和稳定性的影响。此外，还研究了这些改性二氧化硅纳米颗粒稳定长链烷烃、液体石蜡和液晶相的能力。
