Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids

The properties of ionic liquids make them an appealing choice for use as lubricant oil. However, the effect of moisture on the friction properties of ionic liquids needs to be elucidated. Moisture affects the disappearance and growth of the lubricating layer of these liquids. To express the high fri...

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Autores principales:	Shouhei Kawada, Shinya Sasaki, Masaaki Miyatake
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	ionic liquid water humidity hydrophobicity hydrophilicity tof-sims sem-eds 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/08ba6f53d5f0415387d1823646722fc3
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id	oai:doaj.org-article:08ba6f53d5f0415387d1823646722fc3
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spelling	oai:doaj.org-article:08ba6f53d5f0415387d1823646722fc32021-11-05T09:17:25ZEffect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids1881-219810.2474/trol.14.285https://doaj.org/article/08ba6f53d5f0415387d1823646722fc32019-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/5/14_285/_pdf/-char/enhttps://doaj.org/toc/1881-2198The properties of ionic liquids make them an appealing choice for use as lubricant oil. However, the effect of moisture on the friction properties of ionic liquids needs to be elucidated. Moisture affects the disappearance and growth of the lubricating layer of these liquids. To express the high friction reduction effect, the lubricating layer formed by the ionic liquids at the friction interface plays a very important role. Thus, it is necessary to evaluate the relationship between these liquid structures and moisture, for the development of design guidelines for new ionic liquid structures that can achieve very low friction. This investigation evaluated the friction properties and the friction mechanisms of hydrophobic ionic liquids (1-butyl-3-methylimidazolium dicyanamide [BMIM][DCN] and 1-butyl-3- methylimidazolium tetrafluoroborate [BMIM][BF4]), and a hydrophilic ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6]) under various atmospheres (vacuum, dry air, and air) to better understand the effect of moisture on the friction properties. The hydrophilic ionic liquid exhibited differences in the friction properties depending on the atmosphere, while the hydrophobic ionic liquid remained unaffected by the atmosphere. The adsorption layer formed by [BMIM][DCN] was anion-rich, both ion-rich, and cation-rich in vacuum, dry air, and air respectively. In air, [BMIM][BF4] developed corrosive wear and the reaction layer formed by [BMIM][PF6] increased with moisture.Shouhei KawadaShinya SasakiMasaaki MiyatakeJapanese Society of Tribologistsarticleionic liquidwaterhumidityhydrophobicityhydrophilicitytof-simssem-edsPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 5, Pp 285-292 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	ionic liquid water humidity hydrophobicity hydrophilicity tof-sims sem-eds Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	ionic liquid water humidity hydrophobicity hydrophilicity tof-sims sem-eds Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Shouhei Kawada Shinya Sasaki Masaaki Miyatake Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids
description	The properties of ionic liquids make them an appealing choice for use as lubricant oil. However, the effect of moisture on the friction properties of ionic liquids needs to be elucidated. Moisture affects the disappearance and growth of the lubricating layer of these liquids. To express the high friction reduction effect, the lubricating layer formed by the ionic liquids at the friction interface plays a very important role. Thus, it is necessary to evaluate the relationship between these liquid structures and moisture, for the development of design guidelines for new ionic liquid structures that can achieve very low friction. This investigation evaluated the friction properties and the friction mechanisms of hydrophobic ionic liquids (1-butyl-3-methylimidazolium dicyanamide [BMIM][DCN] and 1-butyl-3- methylimidazolium tetrafluoroborate [BMIM][BF4]), and a hydrophilic ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6]) under various atmospheres (vacuum, dry air, and air) to better understand the effect of moisture on the friction properties. The hydrophilic ionic liquid exhibited differences in the friction properties depending on the atmosphere, while the hydrophobic ionic liquid remained unaffected by the atmosphere. The adsorption layer formed by [BMIM][DCN] was anion-rich, both ion-rich, and cation-rich in vacuum, dry air, and air respectively. In air, [BMIM][BF4] developed corrosive wear and the reaction layer formed by [BMIM][PF6] increased with moisture.
format	article
author	Shouhei Kawada Shinya Sasaki Masaaki Miyatake
author_facet	Shouhei Kawada Shinya Sasaki Masaaki Miyatake
author_sort	Shouhei Kawada
title	Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids
title_short	Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids
title_full	Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids
title_fullStr	Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids
title_full_unstemmed	Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids
title_sort	effect of surrounding atmosphere on friction properties of hydrophobic and hydrophilic ionic liquids
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/08ba6f53d5f0415387d1823646722fc3
work_keys_str_mv	AT shouheikawada effectofsurroundingatmosphereonfrictionpropertiesofhydrophobicandhydrophilicionicliquids AT shinyasasaki effectofsurroundingatmosphereonfrictionpropertiesofhydrophobicandhydrophilicionicliquids AT masaakimiyatake effectofsurroundingatmosphereonfrictionpropertiesofhydrophobicandhydrophilicionicliquids
_version_	1718444390588874752

Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids

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