Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity

The significant influences of atmospheric humidity on tribological phenomena are widely recognized. Although the influencing mechanisms of the humidity have been studied for a long time, many of the previous explanations remain in the qualitative estimation of mechanisms particularly from chemical e...

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Autores principales:	Kanao Fukuda, Sie Leeh Sheng, Zaid Ali Subhi
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	adhesion water adsorption polytetrafluoroethylene austenitic stainless steel hydrophobic surface hydrophilic surface 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/caeef50e2df24aeeb19bae06dd42c7ef
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spelling	oai:doaj.org-article:caeef50e2df24aeeb19bae06dd42c7ef2021-11-05T09:17:25ZTribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity1881-219810.2474/trol.14.353https://doaj.org/article/caeef50e2df24aeeb19bae06dd42c7ef2019-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/5/14_353/_pdf/-char/enhttps://doaj.org/toc/1881-2198The significant influences of atmospheric humidity on tribological phenomena are widely recognized. Although the influencing mechanisms of the humidity have been studied for a long time, many of the previous explanations remain in the qualitative estimation of mechanisms particularly from chemical effects viewpoint. In order to elucidate how the adsorbed water on a surface influences tribological phenomena, the current authors conducted ball to ball scratch tests for austenitic stainless steel (JIS SUS304) and proposed the mechanisms from a physical/mechanical viewpoint. A singular phenomenon was found; a lateral force, which can be regarded as a friction resistance, at a downhill motion showed significantly higher value than that at an uphill motion. The phenomenon was hypothesized to be influenced by Laplace pressure effect at a meniscus formed due to adsorbed water on the surface. In this study, polytetrafluoroethylene (PTFE) as the hydrophobic material was tested in comparison with SUS304 to show that the adsorbed water layer causes the singular phenomenon. PTFE successfully prevented the singular phenomenon while SUS304 reproduced it. The equilibrium analysis of the ball showed that adsorbed water contributed to the increase of the coefficient of kinetic friction but not of negative normal force at the contact point of SUS304.Kanao FukudaSie Leeh ShengZaid Ali SubhiJapanese Society of Tribologistsarticleadhesionwater adsorptionpolytetrafluoroethyleneaustenitic stainless steelhydrophobic surfacehydrophilic surfacePhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 5, Pp 353-358 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	adhesion water adsorption polytetrafluoroethylene austenitic stainless steel hydrophobic surface hydrophilic surface Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	adhesion water adsorption polytetrafluoroethylene austenitic stainless steel hydrophobic surface hydrophilic surface Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kanao Fukuda Sie Leeh Sheng Zaid Ali Subhi Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity
description	The significant influences of atmospheric humidity on tribological phenomena are widely recognized. Although the influencing mechanisms of the humidity have been studied for a long time, many of the previous explanations remain in the qualitative estimation of mechanisms particularly from chemical effects viewpoint. In order to elucidate how the adsorbed water on a surface influences tribological phenomena, the current authors conducted ball to ball scratch tests for austenitic stainless steel (JIS SUS304) and proposed the mechanisms from a physical/mechanical viewpoint. A singular phenomenon was found; a lateral force, which can be regarded as a friction resistance, at a downhill motion showed significantly higher value than that at an uphill motion. The phenomenon was hypothesized to be influenced by Laplace pressure effect at a meniscus formed due to adsorbed water on the surface. In this study, polytetrafluoroethylene (PTFE) as the hydrophobic material was tested in comparison with SUS304 to show that the adsorbed water layer causes the singular phenomenon. PTFE successfully prevented the singular phenomenon while SUS304 reproduced it. The equilibrium analysis of the ball showed that adsorbed water contributed to the increase of the coefficient of kinetic friction but not of negative normal force at the contact point of SUS304.
format	article
author	Kanao Fukuda Sie Leeh Sheng Zaid Ali Subhi
author_facet	Kanao Fukuda Sie Leeh Sheng Zaid Ali Subhi
author_sort	Kanao Fukuda
title	Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity
title_short	Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity
title_full	Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity
title_fullStr	Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity
title_full_unstemmed	Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity
title_sort	tribological behavior of hydrophilic and hydrophobic surfaces in atmosphere with different relative humidity
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/caeef50e2df24aeeb19bae06dd42c7ef
work_keys_str_mv	AT kanaofukuda tribologicalbehaviorofhydrophilicandhydrophobicsurfacesinatmospherewithdifferentrelativehumidity AT sieleehsheng tribologicalbehaviorofhydrophilicandhydrophobicsurfacesinatmospherewithdifferentrelativehumidity AT zaidalisubhi tribologicalbehaviorofhydrophilicandhydrophobicsurfacesinatmospherewithdifferentrelativehumidity
_version_	1718444436540620800

Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity

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