链长对离子液体超薄膜微/纳摩擦学性能的影响  

Influence of Chain Length on the Micro/nano-tribological Properties of Ionic Liquid Ultra-thin films

作　　者：赵文杰[1,2] 黄德明[1,2] 王立平[1] 薛群基[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院北京研究生院,北京100049

出　　处：《摩擦学学报》2010年第6期614-619,共6页Tribology

基　　金：国家自然科学基金项目(20773148&50905178);创新群体项目(50721062)的支持和资助

摘　　要：采用浸渍-提拉法在单晶硅片表面成功制备了纳米厚度的具有不同烷基链长的离子液体超薄膜,系统考察了烷基链长对离子液体超薄膜微/纳摩擦学性能的影响.用Mettler热重分析仪测定了离子液体在氮气气氛条件下的热稳定性,采用多功能X射线光电子能谱分析了离子液体超薄膜表面的化学组分,并用接触角仪测定了其亲/疏水性质,薄膜的表面形貌、黏着和纳米摩擦学性质采用原子力显微镜进行了测定,采用微摩擦试验机评价了薄膜的微摩擦学性质.结果表明:离子液体的侧链烷基链长对其作为超薄膜的纳米摩擦学和黏着性质有重要的影响,随着烷基链长的增加,黏着力和纳米摩擦力大幅度降低,但对其微摩擦性能影响不大.同时根据试验结果提出了离子液体超薄膜减摩抗磨机理.Ultra-thin RTILs films with different chain length were successfully prepared on silicon substrates by a dip-coating method.The influence of different chain length on micro/nano-tribological properties of the as-prepared RTILs films was systematically investigated.Thermal stability of the RTILs was evaluated using a Mettler thermal gravity analysis in a nitrogen atmosphere.Chemical compositions of the films were characterized with a multi-functional X-ray Photoelectron Spectrometer.Wetting/dewetting properties were determined by a contact angle measure instrument.The morphologies,nano-friction and nano-adhesion behaviors of RTILs films with different chain length were experimentally investigated at the nanoscale using AFM/FFM.Microfriction properties were evaluated by a microtribometers.The investigation revealed that the chain length of the RTILs films significantly affected their nano-friction and adhesion properties,but had little influence on their microfriction performance.With the increasing of chain length,adhesive force and nanofriction force reduced significantly.The corresponding friction-reduction and anti-wear mechanisms of the ultra-thin RTILs films under tested condition were analyzed based on the experimental observation.

关 键 词：离子液体 超薄膜 链长 微/纳摩擦 黏着 原子力显微镜 

分 类 号：TH117.3[机械工程—机械设计及理论]