表面修饰中空LaF3纳米微粒的制备及其摩擦学性能

在油酸钠/十六烷基溴化铵乳液体系中合成了表面修饰中空LaF3纳米微粒. 通过透射电子显微镜(TEM)、X射线衍射(XRD)、傅立叶变换红外光谱(FTIR)、热重分析(TG-DTG)、能谱分析(EDS)等测试手段对其结构和形貌进行了表征. 同时在四球摩擦磨损试验机上考察了LaF3纳米微粒作为润滑油添加剂时, 添加浓度和施加载荷对其抗磨减摩性能的影响. 结果表明, 此纳米微粒的表面为油酸修饰, 具有中空结构, 平均粒径约17.5 nm; 表面修饰中空油酸/三氟化镧纳米微粒作为成品润滑油的添加剂, 具有良好的抗磨性能. 另外, 对中空纳米微粒的形成机理进行了分析.

Preparation of Surface-Modified Hollow LaF3 Nanoparticles and Their Tribological Performances

Surface-modified hollow LaF3 nanoparticles were prepared in an oleate/cetyltrimethylammoniumbromide micellar emulsion. Their morphology and structure were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transforminfrared spectroscopy (FTIR), thermal analysis (TG-DTG), and energy dispersive X-ray spectroscopy (EDS). The results showed that the LaF3 nanoparticles were hollow, with diameters of ca. 17.5 nm, and an oleate layer was present on their surfaces. The effect of additive concentration and load on nanoparticles’ antiwear and friction reduction properties (as additives in lubricating oil) were evaluated with a four-ball tester. The LaF3 nanoparticles exhibited excellent antiwear and friction reduction properties. The mechanism of hollow nanoparticle formation was also discussed.