Understanding the Friction of Nanometer-Thick Fluorinated Ionic Liquids,Industrial & Engineering Chemistry Research

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Understanding the Friction of Nanometer-Thick Fluorinated Ionic Liquids
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-20 , DOI: 10.1021/acs.iecr.8b03044
Anne C. Lertola ₁ , Bingchen Wang ₁ , Lei Li ₁

Affiliation

Ionic liquids (ILs) show promise as lubricants for nano- and microelectromechanical systems (NEMS/MEMS) and hard disc drives (HDDs). When deposited on solid substrates as nanometer-thick films, these liquids can exhibit a solid-like layering structure, which makes them ideal as lubricants. Moreover, ILs are “designer” materials with many possible molecular structures and tunable properties. In this work, we have experimentally investigated the friction of various nanometer-thick fluorinated ILs on a silica surface using a nanotribometer. We found that surface tension has a significant effect on the friction. When the surface tension of ILs is low, ILs wet the silica surface, and the friction is low. However, when the surface tension is high, ILs form droplets and do not wet the silica surface, which results in higher friction. The effect of moisture at the interface has also been investigated, and the results suggested that water promotes the surface charging of silica, which induces more ordered cation/anion layering and thus reduces the friction. The finding here is critical in designing novel nanometer-thick IL lubricants.

中文翻译：

了解纳米级氟化离子液体的摩擦

离子液体（IL）有望作为纳米和微机电系统（NEMS / MEMS）和硬盘驱动器（HDD）的润滑剂。当以纳米厚膜的形式沉积在固体基材上时，这些液体会表现出固体状的分层结构，这使其成为润滑剂的理想选择。此外，IL是具有许多可能的分子结构和可调特性的“设计”材料。在这项工作中，我们已经使用纳米摩擦计实验研究了各种纳米厚度的氟化IL在二氧化硅表面上的摩擦。我们发现表面张力对摩擦有重要影响。当IL的表面张力低时，IL会润湿二氧化硅表面，并且摩擦力也低。但是，当表面张力较高时，IL会形成液滴且不会润湿二氧化硅表面，这会导致较高的摩擦力。还研究了水分在界面上的影响，结果表明水促进了二氧化硅的表面带电，从而引起了更多有序的阳离子/阴离子分层，从而降低了摩擦。在设计新型纳米级IL润滑剂时，这一发现至关重要。

更新日期：2018-08-21

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