摘要
用 X射线光电子能谱 ( XPS)研究了玻璃基体上沉积脂肪酸及二烷基二硫代磷酸 ( DDP)修饰的 Mo S2 纳米微粒LB膜摩擦前后的结构变化 .结果表明 :二十酸 LB膜经一定次数摩擦后其结构发生明显变化 ,摩擦后 C— H链的比例降低 ,而极性基团的比例显著增加 ,这可归因于其在摩擦力作用下发生诸如转移及有序化转变等一系列摩擦化学变化 .表面修饰 Mo S2 纳米微粒 LB膜摩擦前后结构不发生明显变化 ,且经一定次数摩擦后其磨痕上仍可检测到Mo S2 ,说明正是由于无机纳米核的高承载作用而使其表现出比脂肪酸 LB膜更优异的抗磨性能 .
The structural changes of fatty acids and a dialkyldithiophosphate (DDP) modified MoS 2 nanoparticle LB films on glass substrate during rubbing process were investigated by means of X ray photoelectron spectroscopy (XPS). It has been found that arachidic acid LB film experiences structural change during friction process. Subsequently the proportion of C—H is decreased, while the proportion of polar group increased after rubbing. This is attributed to a series of tribochemical changes taking place under frictional force. At the same time, no significant structural change was observed for DDP MoS 2 nanoparticle LB film. The corresponding XPS analytical results indicate that MoS 2 and other compound containing Mo and S exist in the wear track after rubbing of DDP MoS 2 nanoparticle LB film for some cycles. This indicates that the improved antiwear behavior of DDP MoS 2 nanoparticle LB film could be attributed to higher load carrying capacity of inorganic MoS 2 nanoparticle nuclei.
出处
《摩擦学学报》
CSCD
北大核心
2000年第3期211-213,共3页
Tribology
基金
国家自然科学基金资助项目! ( 5973 51 1 0 )
杰出青年基金资助项目! ( 5982 51 1 6)
科技部攀登预研资助项目! ( 95-预 -0 7)
