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Friction 2022, 10(2): 179-199 https://doi.org/10.1007/s40544-020-0474-0
Review Article | Open Access | Issue | Published: 11 February 2021

Applications of sum-frequency generation vibrational spectroscopy in friction interface

Show Author's Information Zhifeng LIU1,3,  Mengmeng LIU1,  Caixia ZHANG1,3( ),  Hongyan CHU1,3,  Liran MA2( ),  Qiang CHENG1,3,  Hongyun CAI3,  Junmin CHEN3
Institute of Advanced Manufacturing and Intelligent Technology, Beijing University of Technology, Beijing 100124, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124, China
Keywords:
SFG vibrational spectroscopy, film-based lubricating systems, complex oil-based lubricating systems, water-based lubricating systems
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LIU Z, LIU M, ZHANG C, et al. Applications of sum-frequency generation vibrational spectroscopy in friction interface. Friction, 2022, 10(2): 179-199. https://doi.org/10.1007/s40544-020-0474-0
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Abstract Full text About this article

Sum-frequency generation (SFG) vibrational spectroscopy is a second-order nonlinear optical spectroscopy technique. Owing to its interfacial selectivity, SFG vibrational spectroscopy can provide interfacial molecular information, such as molecular orientations and order, which can be obtained directly, or molecular density, which can be acquired indirectly. Interfacial molecular behaviors are considered the basic factors for determining the tribological properties of surfaces. Therefore, owing to its ability to detect the molecular behavior in buried interfaces in situ and in real time, SFG vibrational spectroscopy has become one of the most appealing technologies for characterizing mechanisms at friction interfaces. This paper briefly introduces the development of SFG vibrational spectroscopy and the essential theoretical background, focusing on its application in friction and lubrication interfaces, including film-based, complex oil-based, and water-based lubricating systems. Real-time detection using SFG promotes the nondestructive investigation of molecular structures of friction interfaces in situ with submonolayer interface sensitivity, enabling the investigation of friction mechanisms. This review provides guidance on using SFG to conduct friction analysis, thereby widening the applicability of SFG vibrational spectroscopy.


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About this article

Applications of sum-frequency generation vibrational spectroscopy in friction interface

Show Author's information Zhifeng LIU1,3, Mengmeng LIU1, Caixia ZHANG1,3( ), Hongyan CHU1,3, Liran MA2( ), Qiang CHENG1,3, Hongyun CAI3, Junmin CHEN3
Institute of Advanced Manufacturing and Intelligent Technology, Beijing University of Technology, Beijing 100124, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124, China

Abstract

Sum-frequency generation (SFG) vibrational spectroscopy is a second-order nonlinear optical spectroscopy technique. Owing to its interfacial selectivity, SFG vibrational spectroscopy can provide interfacial molecular information, such as molecular orientations and order, which can be obtained directly, or molecular density, which can be acquired indirectly. Interfacial molecular behaviors are considered the basic factors for determining the tribological properties of surfaces. Therefore, owing to its ability to detect the molecular behavior in buried interfaces in situ and in real time, SFG vibrational spectroscopy has become one of the most appealing technologies for characterizing mechanisms at friction interfaces. This paper briefly introduces the development of SFG vibrational spectroscopy and the essential theoretical background, focusing on its application in friction and lubrication interfaces, including film-based, complex oil-based, and water-based lubricating systems. Real-time detection using SFG promotes the nondestructive investigation of molecular structures of friction interfaces in situ with submonolayer interface sensitivity, enabling the investigation of friction mechanisms. This review provides guidance on using SFG to conduct friction analysis, thereby widening the applicability of SFG vibrational spectroscopy.

Keywords: SFG vibrational spectroscopy, film-based lubricating systems, complex oil-based lubricating systems, water-based lubricating systems

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Publication history
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Acknowledgements
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Publication history

Received: 05 June 2020
Revised: 25 October 2020
Accepted: 19 November 2020
Published: 11 February 2021
Issue date: February 2022

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© The author(s) 2020

Acknowledgements

The authors appreciate the funding supported by the National Natural Science Foundation of China (51705010, 51675297, and 51527901), the Beijing Natural Science Foundation (3192003), the General Project of Science and Technology Plan from Beijing Educational Committee (KM201810005013), the Tribology Science Fund of State Key Laboratory of Tribology (STLEKF16A02, SKLTKF19B08), and the training program of Rixin talent and outstanding talent from Beijing University of Technology.

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