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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Japanese Society of Tribologists
2019-12-01
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| Series: | Tribology Online |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/trol/14/5/14_353/_pdf/-char/en |
| _version_ | 1830430350011006976 |
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| author | Kanao Fukuda Sie Leeh Sheng Zaid Ali Subhi |
| author_facet | Kanao Fukuda Sie Leeh Sheng Zaid Ali Subhi |
| author_sort | Kanao Fukuda |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T01:47:35Z |
| format | Article |
| id | doaj.art-caeef50e2df24aeeb19bae06dd42c7ef |
| institution | Directory Open Access Journal |
| issn | 1881-2198 |
| language | English |
| last_indexed | 2024-12-21T01:47:35Z |
| publishDate | 2019-12-01 |
| publisher | Japanese Society of Tribologists |
| record_format | Article |
| series | Tribology Online |
| spelling | doaj.art-caeef50e2df24aeeb19bae06dd42c7ef2022-12-21T19:19:58ZengJapanese Society of TribologistsTribology Online1881-21982019-12-0114535335810.2474/trol.14.353trolTribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative HumidityKanao Fukuda0Sie Leeh Sheng1Zaid Ali Subhi2Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi MalaysiaMalaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi MalaysiaMalaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi MalaysiaThe 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.https://www.jstage.jst.go.jp/article/trol/14/5/14_353/_pdf/-char/enadhesionwater adsorptionpolytetrafluoroethyleneaustenitic stainless steelhydrophobic surfacehydrophilic surface |
| spellingShingle | Kanao Fukuda Sie Leeh Sheng Zaid Ali Subhi Tribological Behavior of Hydrophilic and Hydrophobic Surfaces in Atmosphere with Different Relative Humidity Tribology Online adhesion water adsorption polytetrafluoroethylene austenitic stainless steel hydrophobic surface hydrophilic surface |
| title | 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_short | 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 |
| topic | adhesion water adsorption polytetrafluoroethylene austenitic stainless steel hydrophobic surface hydrophilic surface |
| url | https://www.jstage.jst.go.jp/article/trol/14/5/14_353/_pdf/-char/en |
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