表面修饰SiO_2纳米微粒的制备及其摩擦学性能研究

Preparation and Tribological Properties of Surface-capped SiO_2 Nanoparticles

根据Stber法,控制和调节反应物的浓度制备出不同粒径的SiO2乙醇溶胶,利用十八醇,在高温、惰性气氛条件下进行酯化反应,对无机纳米微粒进行表面化学修饰,制备出油溶性的纳米微粒;将不同粒径的油溶性SiO2纳米微粒用作润滑油添加剂,对其摩擦学性能进行评价。结果表明:制备的表面修饰SiO2纳米微粒粒径分布均匀,能在有机溶剂和油中分散形成稳定的有机溶胶;纳米微粒粒径大小对其摩擦学性能有一定影响,SiO2纳米微粒的粒径越小,减摩抗磨效果越好,因为小的纳米微粒更容易在金属磨损表面形成低熔点且易剪切的纳米润滑防护层。

Octadecanol surface-capped SiO2 nanoparticles were synthesized by the procedure originally described by Stboer. The tribological properties of the synthesized products as additive in liquid paraffin were evaluated on a four-ball machine. The experimental results show that the synthesized surface-capped SiO2 nanoparticles has uniform particle size distribution, which can disperse in the organic solvent and lubricating oil to form stable organic colloids. The smaller the nanoparticles, the better the tribological properties.