摘要
利用化学合成法在非水体系中制备了硬脂酸表面修饰的油溶性γ Fe2 O3纳米颗粒 ;用透射电子显微镜、X射线衍射仪、X射线光电子能谱仪和红外光谱仪表征了合成产物的形貌、结构和组成 ;用四球摩擦磨损试验机评价了油溶性γ Fe2 O3纳米颗粒作为润滑油添加剂对液体石蜡减摩抗磨作用的影响。结果表明 ,所制备的纳米颗粒是由无机γ Fe2 O3纳米核及化学吸附其表面的硬脂酸单分子层组成 ,无机纳米核平均粒径为 4nm ;其作为润滑油添加剂在适宜浓度范围内可以明显增强液体石蜡的减摩抗磨能力。
Stearic acid (SA) surface-capped γ-Fe 2O 3 nanoparticles were chemically synthesized in an anhydrous medium. The morphology, structure, and composition of the synthetic product were characterized with TEM, XRD, XPS and FTIS. The effect of the synthetic product as additive in liquid paraffin on its friction-reducing and antiwear ability was evaluated on a four-ball machine. The results show that the prepared SA-capped γ-Fe 2O 3 nanoparticles consist of γ-Fe 2O 3 nanocores with an average diameter of 4 nm and a stearic acid capped-layer chemically absorbed on the surface of the nanocores. As additive in liquid paraffin at proper concentrations, the nanoparticles can markedly promote its friction-reducing and antiwear ability. In combination with their good dispersion stability in oils, it was supposed that the SA-capped γ-Fe 2O 3 nanoparticles could be a promising novel nano additive for lubricating oils and greases.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2004年第4期607-610,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目 (50 2 350 30
2 0 0 2AA30 2 60 7)
