SCL@SiO2纳米颗粒制备及其稳定Pickering乳液的研究

Preparation of SCL@SiO2 Nanoparticles and the Stabilized Pickering Emulsion

摘要:

用共轭亚油酸钠（SCL）在SiO2纳米颗粒表面吸附，得到表面改性的SiO2纳米颗粒，然后在80 oC条件下通过热聚合引发SCL分子自交联，从而稳定SCL@SiO2纳米颗粒的SCL层并改善表面润湿性。通过Zeta电位表征手段证实SCL吸附在SiO2纳米颗粒表面。以SCL@SiO2纳米颗粒作为单一乳化剂制备液体石蜡的Pickering乳液，结果表明该Pickering乳液比传统乳液更稳定。由于SCL@SiO2纳米颗粒的SCL层比简单吸附脂肪酸的SiO2改性颗粒更稳定，且粒径会随着pH的变化而发生变化，因此由其稳定的Pickering乳液具有一定的pH响应性。

Abstract:

Surface modified SiO2 nanoparticles, SCL@SiO2 were prepared by adsorbing sodium conjugated linoleate (SCL) on the surface of SiO2 nanoparticles, in which SCL molecules were stabilized through self-crosslinking by thermal polymerization at 80 oC and the surface wettability of SiO2 nanoparticles was improved. Zeta potential results showed that SCL was adsorbed and solidified on the surface of SiO2 nanoparticles by this way. Liquid paraffin/water type Pickering emulsion was stabilized by the SCL@SiO2 nanoparticles alone and more stable than conventional emulsion. Moreover, the adsorbed and polymerized SCL layer on the SCL@SiO2 nanoparticles was more stable than the simply SCL-adsorbed SiO2 nanoparticles, which causes sizes of both the SCL@SiO2 nanoparticles and the resulted Pickering emulsion droplets were pH-responsive.