| 摘要: |
| 粘着、摩擦和磨损是影响微/纳机电器件稳定性和寿命的关键因素。利用浸渍-提拉法在硅基底上制备了两种具有单、双咪唑环阳离子结构的离子液体薄膜。采用热重分析仪评价了离子液体的热稳定性。利用原子力显微镜测定了薄膜的表面形貌和纳米摩擦学性能。利用球-盘式摩擦试验机考察了载荷和频率对薄膜的微摩擦学性质的影响。对比分析了基于不同阳离子结构的薄膜的微/纳摩擦学性能。结果表明：两种离子液体薄膜的纳米摩擦力随着原子力针尖扫描频率的增加而增加，且［BMIM］PF6薄膜的摩擦力低于2［BMIM］PF6薄膜。此外，［BMIM］PF6薄膜的微摩擦系数低于2［BMIM］PF6。因此，离子液体的阳离子结构对其作为薄膜的微/纳摩擦学性能有重要影响。 |
| 关键词: 离子液体 薄膜 微/纳摩擦 粘着力 阳离子结构 |
| DOI： |
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| 基金项目: |
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| Effect of Monocationic and Dicationic Imidazolium on Micro/Nanotribological Properties of Ionic Liquid Films |
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ZHAO Wenjie1,2, LIU Gang1, WANG Yongxin1, WANG Liping2, CHEN Jianmin1, XUE Qunji1
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（1. Ningbo Key Laboratory of Marine Protection Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang; 2．State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000)
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| Abstract: |
| Adhesion, friction and wear remain as the key issues severely limiting the realization and reliability of micro/nanoelectromechanical systems devices. Two types of molecularly thin films of ionic liquids (ILs) with monocationic and dicationic imidazolium based structure were prepared on silicon substrates through dipcoating method. Thermal stability of the ILs was evaluated by thermal gravity analysis (TGA). Nanoscale adhesion and friction forces between the films and AFM tip were measured by FFM. Meanwhile, the morphologies of the films were also investigated by AFM. Microscale friction properties between the films and Si3N4 ball were evaluated using a ballondisk and reciprocating microtribometer. The micro/nanotribological behaviors between the films were compared and discussed in terms of different cationic structures. The results show that the nanofriction force of both two IL films increases with increasing frequency of AFM tip. The microfriction coefficient of ［BMIM］PF6 film was lower than that of 2［BMIM］PF6 film. The investigation reveals that mono or dication RTILs significantly affect their tribological behaviors in both micro and nanoscales. |
| Key words: ionic liquid thin film micro/nanofriction adhesion cationic structure |
