Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid

Self-assembled monolayers (SAMs) of hexadecanethiol (HDT) and 16-mercaptohexadecanoic acid (MHDA) were used to vary the surface chemical properties, and oleic acid (OA) was used as a lubricant. A pin-on-disk tribometer equipped with Fourier transform IR (FT-IR) spectroscopy was used to evaluate the...

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Autores principales:	Koji Miyake, Takamasa Kume, Miki Nakano, Atsushi Korenaga, Koji Takiwatari, Ryo Tsuboi, Shinya Sasaki
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2012
Materias:	ft-ir sfg sam surface chemical property oleic acid lubrication in-situ measurement Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/593c31d0e00d4e578f8310bf7989b953
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id	oai:doaj.org-article:593c31d0e00d4e578f8310bf7989b953
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spelling	oai:doaj.org-article:593c31d0e00d4e578f8310bf7989b9532021-11-05T09:24:50ZEffects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid1881-219810.2474/trol.7.218https://doaj.org/article/593c31d0e00d4e578f8310bf7989b9532012-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/7/4/7_218/_pdf/-char/enhttps://doaj.org/toc/1881-2198Self-assembled monolayers (SAMs) of hexadecanethiol (HDT) and 16-mercaptohexadecanoic acid (MHDA) were used to vary the surface chemical properties, and oleic acid (OA) was used as a lubricant. A pin-on-disk tribometer equipped with Fourier transform IR (FT-IR) spectroscopy was used to evaluate the results of lubricants under various lubricating condition, and sum frequency generation (SFG) spectroscopy was used to obtain static information on the molecular structure of the boundary layer. The FT-IR results for the frictional properties of the SAMs lubricated with OA indicated that a transition from the hydrodynamic to mixed lubrication regime for the HDT-SAM occurred, however, the MHDA-SAM remained in the hydrodynamic lubrication regime under our experimental conditions. The FT-IR results indicate that in the hydrodynamic lubrication regime, the gauche/trans conformer ratio in the OA molecules decreased with the thinning of the oil film thickness for both HDT- and MHDA-SAMs. Upon the transition from the hydrodynamic to mixed lubrication regime, the gauche/trans conformer ratio increased. The SFG results for OA/HDT interface indicated that the HDT layer was only slightly influenced by the adsorption of OA, however, the adsorbed layer of the OA contained significant gauche defects. For the MHDA-SAM, OA molecules were adsorbed on the surface through hydrogen-bonding between their carboxyl groups. From the SFG and FT-IR results, the difference in the interaction between the types of SAMs and the OA is considered to affect the frictional properties of SAMs lubricated with OA.Koji MiyakeTakamasa KumeMiki NakanoAtsushi KorenagaKoji TakiwatariRyo TsuboiShinya SasakiJapanese Society of Tribologistsarticleft-irsfgsamsurface chemical propertyoleic acidlubricationin-situ measurementPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 7, Iss 4, Pp 218-224 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	ft-ir sfg sam surface chemical property oleic acid lubrication in-situ measurement Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	ft-ir sfg sam surface chemical property oleic acid lubrication in-situ measurement Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Koji Miyake Takamasa Kume Miki Nakano Atsushi Korenaga Koji Takiwatari Ryo Tsuboi Shinya Sasaki Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid
description	Self-assembled monolayers (SAMs) of hexadecanethiol (HDT) and 16-mercaptohexadecanoic acid (MHDA) were used to vary the surface chemical properties, and oleic acid (OA) was used as a lubricant. A pin-on-disk tribometer equipped with Fourier transform IR (FT-IR) spectroscopy was used to evaluate the results of lubricants under various lubricating condition, and sum frequency generation (SFG) spectroscopy was used to obtain static information on the molecular structure of the boundary layer. The FT-IR results for the frictional properties of the SAMs lubricated with OA indicated that a transition from the hydrodynamic to mixed lubrication regime for the HDT-SAM occurred, however, the MHDA-SAM remained in the hydrodynamic lubrication regime under our experimental conditions. The FT-IR results indicate that in the hydrodynamic lubrication regime, the gauche/trans conformer ratio in the OA molecules decreased with the thinning of the oil film thickness for both HDT- and MHDA-SAMs. Upon the transition from the hydrodynamic to mixed lubrication regime, the gauche/trans conformer ratio increased. The SFG results for OA/HDT interface indicated that the HDT layer was only slightly influenced by the adsorption of OA, however, the adsorbed layer of the OA contained significant gauche defects. For the MHDA-SAM, OA molecules were adsorbed on the surface through hydrogen-bonding between their carboxyl groups. From the SFG and FT-IR results, the difference in the interaction between the types of SAMs and the OA is considered to affect the frictional properties of SAMs lubricated with OA.
format	article
author	Koji Miyake Takamasa Kume Miki Nakano Atsushi Korenaga Koji Takiwatari Ryo Tsuboi Shinya Sasaki
author_facet	Koji Miyake Takamasa Kume Miki Nakano Atsushi Korenaga Koji Takiwatari Ryo Tsuboi Shinya Sasaki
author_sort	Koji Miyake
title	Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid
title_short	Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid
title_full	Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid
title_fullStr	Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid
title_full_unstemmed	Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid
title_sort	effects of surface chemical properties on the frictional properties of self-assembled monolayers lubricated with oleic acid
publisher	Japanese Society of Tribologists
publishDate	2012
url	https://doaj.org/article/593c31d0e00d4e578f8310bf7989b953
work_keys_str_mv	AT kojimiyake effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid AT takamasakume effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid AT mikinakano effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid AT atsushikorenaga effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid AT kojitakiwatari effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid AT ryotsuboi effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid AT shinyasasaki effectsofsurfacechemicalpropertiesonthefrictionalpropertiesofselfassembledmonolayerslubricatedwitholeicacid
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Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid

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