固体稳定乳液（Pickering乳液）是以固体粒子作为乳化剂代替传统乳液中表面活性剂的一种热力学稳定、动力学不稳定的体系。固体粒子的润湿性是影响固体稳定乳液的主要因素之一。目前固体粒子的润湿性主要通过分子尺度的方法调节，而纳米尺度方法调节固体粒子的润湿性的研究还相对较少。鉴于此，本文主要通过纳米尺度调节固体颗粒表面的润湿性，研究改良的固体粒子的润湿性对乳液稳定性的影响，混合固体粒子对Pickering乳液稳定性的影响；以Pickering乳液作为新型的模版，将固体粒子组装在界面上，制备出新型的纳米无机/有机组装材料，并通过组装的材料分析固体粒子稳定乳液后，固体粒子在界面上的行为；同时在制备稳定乳液的基础之上，研究了乳液催化方向的应用。 在醇-水混合溶剂体系中，以氨水作催化剂，正硅酸乙酯为硅源，通过溶胶-凝胶法制备出单分散的纳米SiO2球形颗粒。纳米Ag粒子离散的复合在SiO2粒子表面，对所制备的纳米SiO2粒子进行表面改性。通过调节Ag(NH3)2+溶液的量，制备出具有不同Ag负载量的纳米Ag/SiO2复合粒子，并表征其相对亲疏水性。并把具有不同润湿性的纳米Ag/SiO2复合粒子、两种不同纳米Ag/SiO2复合粒子为乳化剂制备Pickering乳液，考察纳米复合Ag/SiO2粒子亲疏水性、混合纳米Ag/SiO2复合粒子对Pickering乳液稳定性的影响，结果表明，对于单组分的Pickering乳液而言，乳液的稳定性与纳米Ag/SiO2复合粒子亲水疏水性密切联系，二氧化硅的表面银过高或过低的负载量均不能形成稳定的Pickering乳液。Pickering乳液的稳定性随连续相与分散相（油/水）体积比增加而降低。混合两组分纳米Ag/SiO2复合粒子可以有效提高Pickering乳液稳定性。 以上述固体稳定Pickering乳液为模版，将纳米复合Ag/SiO2粒子分散于苯乙烯和水中，通过苯乙烯的升温聚合反应，制备Ag/SiO2/聚苯乙烯三级结构复合材料。用扫描电子显微镜对产物进行表征，借助该三级复合材料研究纳米Ag/SiO2复合粒子在Pickering 乳液界面上的行为。结果表明，具有适中润湿性的纳米Ag/SiO2复合粒子在界面上的吸附量较多，纳米Ag/SiO2复合粒子之间的一定絮凝作用，增强了界面膜的强度，能有效增加Pickering乳液的稳定性。 在Pickering 乳液体系中，以甲基橙为研究对象，研究Pickering乳液体系中的光催化作用。结果表明：稳定的Pickering 乳液中的催化效果，由纳米Ag/SiO2复合粒子的光催化作用和油相的溶解作用共同实现。

Solid-stabilized emulsions (Pickering emulsions), which is a thermodynamic stability and dynamic instability system, is stabilized by solid particles as emulsifier instead of the traditional surfactant. Stability of emulsion is crucially dependent on the wettability of the particles. At present, the solid particle’s wettability is mainly adjusted on molecule scale. However, there are rare reports on adjusting the wettability of solid particle by attaching nanoparticles at their surface. In the paper, the effect of emulsion stability by the particles’ wettability turned on the nano-scale was investigated and the effect of mixed solid particles on the stability of Pickering emulsions was discussed. The prepared Pickering emulsions were used as template to prepare the inorganic / organic composite material, which was useful to analyze the particles’ behavior in the interface of Pickering emulsion. Meanwhile the photocatalysis in the stable Pickering emulsion was studied. Using ammonia as catalyzer, mono-dispersed nano-SiO2 spherical particles were prepared by hydrolysis of tetraethoxy-silicane (TEOS) in alcohol-water mixed solvents. The silica nanoparticles were modified by attaching the silver nanaparticles to their surface. The hydrophobic of silica particles could be adjusted by attaching silver nanoparticles of different sizes to their surfaces through the mount of Ag(NH3)2+ solution. The hydrophobicity of Ag/SiO2 composite nanoparticles was characterized. Different Ag/SiO2 nanoparticle-stabilized emulsions and mixed Ag/SiO2 nanoparticle-stabilized emulsions were prepared. The stability of the emulsions was observed by optical microscope. As a result, the stability of single particle-stabilized emulsions was connected with the particles’ wettability, namely the stable Pickering emulsion stabilized by the solid particles with higher or lower silver attached couldn’t be obtained; the stability of Pickering emulsion stabilized by two kinds of mixed particles could be improved and decreased With increasing the oil/water volume ratio. Through the way of polymerization, the assembly of Ag/SiO2/polystyrene third-class composite materials was prepared in the stable Pickering emulsion. The products were characterized by Scan Electrical Microscope (SEM), which is an useful way to learn the behavior of the Ag/SiO2 composite nanoparticles on the surface of polymer. The results show that adsorption of Ag/SiO2 nanoparticles with moderate wettability could be more on the interface of polymer; there were certain flocculate activities between Ag/SiO2 nanoparticles, which enhanced the strength of the interfacial film to increase the stability of the Pickering emulsion. The photocatalytic degradation of methyl orange in Pickering emulsion was investigated. The results showed that the photocatalytic activity of the Ag/SiO2 composite nanoparticles and the dissolving action of oil had cooperative effect on the Pickering emulsion catalysis.