Study of Friction-Reduction Properties of Fatty Acids and Adsorption Structures of their Langmuir–Blodgett Monolayers using Sum-Frequency Generation Spectroscopy and Atomic Force Microscopy

详细信息    查看全文

• 作者：Hiroaki Koshima ; Yoko Iyotani ; Qiling Peng ; Shen Ye
• 关键词：Friction ; Friction ; reduction additive ; Fatty acid ; Surface ; Langmuir–Blodgett monolayer ; Sum ; frequency generation (SFG) vibrational spectroscopy ; Atomic force microscope (AFM)
• 刊名：Tribology Letters
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：64
• 期：3
• 全文大小：934 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Tribology, Corrosion and Coatings
  Surfaces and Interfaces and Thin Films
  Theoretical and Applied Mechanics
  Physical Chemistry
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1573-2711
• 卷排序：64

文摘

The establishment of a sustainable society requires fuel-efficient vehicles in which lubricants play important roles. Blending optimum amounts of friction modifiers with lubricant is widely used to reduce fuel consumption caused by frictional loss. However, selection of the appropriate blending still strongly depends on experience. To develop a general selection role for the friction-reduction additives based on a quantitative standard, a number of C₁₈-based fatty acids have been evaluated on the solid surfaces by different methods in the present study. In addition to the measurement of the friction coefficient (μ), the adsorption structures of the Langmuir–Blodgett monolayers of the fatty acids and their effects on the friction-reduction behaviors have been investigated using surface pressure–area (π–A) isotherms, sum-frequency generation vibrational spectroscopy and atomic force microscope. The present experimental results demonstrate a certain relationship between the adsorption structures of the fatty acids on the solid surface and their friction-reduction behaviors.