采用Stöber法制备了形貌规整的SiO₂，利用均匀沉淀法将CdS离散复合在SiO₂表面，合成不同疏水性的CdS/SiO₂复合粒子，以CdS/SiO₂复合粒子为乳化剂制备Pickering乳液。通过SEM、EDS分析CdS/SiO₂复合粒子，数码生物显微镜观察Pickering乳液液滴。结果表明，在CdSO₄和硫代乙酰胺（TAA）质量摩尔浓度分别为0.01、0.01 mol/L时制备的CdS/SiO₂复合粒子的疏水性随着CdS复合次数的增多而增大；在CdSO₄和TAA浓度分别为0.000 1、0.001 mol/L时制备的CdS/SiO₂复合粒子疏水性无变化。SEM分析结果表明，CdS的尺寸随着复合次数的增加而变大。用不同复合次数的CdS/SiO₂复合粒子所制备的Pickering乳液均为O/W型，随着复合次数的增加，乳液液滴的数量和半径均增大，稳定时间也逐渐增大。

SiO₂ with regular morphology is prepared by Stöber method.CdS/SiO₂ composite particles with different hydrophobicity are prepared through discretely compounding CdS on the surface of SiO₂ by homogeneous precipitation method.Pickering emulsion is prepared by using CdS/SiO₂ composite particles as emulsifier.CdS/SiO₂ composite particles are analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).Pickering emulsion droplets are observed by a digital biological microscope.Results show that the hydrophobicity of CdS/SiO₂ composite particles prepared under c_CdSO4=0.01 mol·L^-1 and c_TAA=0.01 mol·L^-1 increases with the increase of CdS compounding times.However,the hydrophobicity of CdS/SiO₂ composite particles prepared under c_CdSO4=0.000 1 mol·L^-1 and c_TAA=0.001 mol·L^-1 remains unchanged.SEM image shows that the size of CdS becomes larger as the times of CdS compounding increases.Pickering emulsions prepared from CdS/SiO₂ composite particles with different compounding times are always O/W type.With the increase of CdS compounding times,the number and radius of emulsion droplets increase,and the stabilization time prolongs gradually.

高健强(1992-),男,硕士研究生,主要从事新型纳米材料和催化反应新技术研究,1063942116@qq.com