期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 22, 页码 4032-4037出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz502188g
关键词
-
类别
资金
- Leverhulme Trust [F07-134DK, F07-134DN]
- Taiho Kogyo Research Foundation
- COST Action Understanding and Controlling Nano and Mesoscale Friction [MP1303]
- John Fell Fund (Oxford University)
The prevailing paradigm in boundary lubrication asserts, in essence, that surfaces coated in amphiphiles slide past each other by way of the slippery exposed alkyl chains while the polar head group remains anchored at the surface. Here we show, for ionic liquid boundary lubricants, that the molecular mechanism of shearing is more subtle; while a monolayer on each surface gives rise to alkyl plane shearing, a bilayer on each surface shears at the ionic (nonalkyl) interface. The incorporation of water from the environment dramatically alters the shear at ionic interfaces but leaves alkyl plane shearing unaffected. Our experiments involve shearing two identical and atomically smooth surfaces past one another with films of an ionic liquid between, with subnanometer control of the film thickness and ultrasensitive shear stress resolution. With this, we uncover molecular mechanistic details relevant to boundary lubrication in general and the development of ionic liquid lubricants in particular.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据