Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media

The water contact angles of disks coated with Z-tetraol and A20H decreased gradually with time, starting from the initial value of approximately 105° and approaching a value below 100° in 20 seconds. The cause of temporal change was the interaction between the polar end groups of lub...

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Autores principales:	Akinobu Wakabayashi, Paul H. Kasai
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2008
Materias:	hard disk water contact angle temporal change perfluoropolyether dynamic behavior 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/fe5a65ef8e1c44b79edb57a0cd59183a
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id	oai:doaj.org-article:fe5a65ef8e1c44b79edb57a0cd59183a
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spelling	oai:doaj.org-article:fe5a65ef8e1c44b79edb57a0cd59183a2021-11-05T09:29:17ZWater Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media1881-219810.2474/trol.3.44https://doaj.org/article/fe5a65ef8e1c44b79edb57a0cd59183a2008-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/3/2/3_2_44/_pdf/-char/enhttps://doaj.org/toc/1881-2198The water contact angles of disks coated with Z-tetraol and A20H decreased gradually with time, starting from the initial value of approximately 105° and approaching a value below 100° in 20 seconds. The cause of temporal change was the interaction between the polar end groups of lubricant molecules and water molecules of the droplet. In the measurement environment, a part of the polar end groups was attracted to a polar droplet from the carbon surface. The contact angle consequently decreased. However, on the robust lubricant films prepared by using the ester lubricants with long-UV (254 nm) irradiation, the temporal changes were not observed. It attests to the formation of chemical bonds without polar end groups. It is proposed that the temporal change of the contact angles reflected dynamic behavior of the lubricant molecules on the disk surface.Akinobu WakabayashiPaul H. KasaiJapanese Society of Tribologistsarticlehard diskwater contact angletemporal changeperfluoropolyetherdynamic behaviorPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 3, Iss 2, Pp 44-47 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	hard disk water contact angle temporal change perfluoropolyether dynamic behavior Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	hard disk water contact angle temporal change perfluoropolyether dynamic behavior Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Akinobu Wakabayashi Paul H. Kasai Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media
description	The water contact angles of disks coated with Z-tetraol and A20H decreased gradually with time, starting from the initial value of approximately 105° and approaching a value below 100° in 20 seconds. The cause of temporal change was the interaction between the polar end groups of lubricant molecules and water molecules of the droplet. In the measurement environment, a part of the polar end groups was attracted to a polar droplet from the carbon surface. The contact angle consequently decreased. However, on the robust lubricant films prepared by using the ester lubricants with long-UV (254 nm) irradiation, the temporal changes were not observed. It attests to the formation of chemical bonds without polar end groups. It is proposed that the temporal change of the contact angles reflected dynamic behavior of the lubricant molecules on the disk surface.
format	article
author	Akinobu Wakabayashi Paul H. Kasai
author_facet	Akinobu Wakabayashi Paul H. Kasai
author_sort	Akinobu Wakabayashi
title	Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media
title_short	Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media
title_full	Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media
title_fullStr	Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media
title_full_unstemmed	Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media
title_sort	water contact angle: time dependence and lubricant dynamics on hard disk media
publisher	Japanese Society of Tribologists
publishDate	2008
url	https://doaj.org/article/fe5a65ef8e1c44b79edb57a0cd59183a
work_keys_str_mv	AT akinobuwakabayashi watercontactangletimedependenceandlubricantdynamicsonharddiskmedia AT paulhkasai watercontactangletimedependenceandlubricantdynamicsonharddiskmedia
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Water Contact Angle: Time Dependence and Lubricant Dynamics on Hard Disk Media

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