Tribological Properties of LB films Measured under Zero Applied Load

We examined the pull-off and friction forces between an atomic force microscope (AFM) probe and submicron-scale asperities covered with Langmuir Blodgett (LB) films. First, we used a focused ion beam to produce several kinds of asperity arrays on two silicon substrates. The average radius of curvatu...

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Autores principales:	Yasuhisa Ando, Takashi Igari, Shigeyuki Mori
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2007
Materias:	friction force pull-off force radius of curvature stearic acid fluoro-carboxylic acid afm asperity array 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/25b6a27def9d4ccfa524aa4b61890732
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spelling	oai:doaj.org-article:25b6a27def9d4ccfa524aa4b618907322021-11-05T09:30:03ZTribological Properties of LB films Measured under Zero Applied Load1881-219810.2474/trol.2.23https://doaj.org/article/25b6a27def9d4ccfa524aa4b618907322007-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/2/1/2_1_23/_pdf/-char/enhttps://doaj.org/toc/1881-2198We examined the pull-off and friction forces between an atomic force microscope (AFM) probe and submicron-scale asperities covered with Langmuir Blodgett (LB) films. First, we used a focused ion beam to produce several kinds of asperity arrays on two silicon substrates. The average radius of curvature was 95 to 800 nm, depending on the asperity array. An LB film of stearic acid (C17H35COOH) or fluoro-carboxylic acid (C6F13C11H22COOH) was deposited on each substrate. The friction force was measured at each asperity array under a zero applied load. The pull-off force was measured at each asperity array and also at controlled relative humidities of 3 to 73%. The results showed that the pull-off and friction forces were almost proportional to the radius of the curvature of the asperity peak with both stearic acid and fluoro-carboxylic acid LB films. The gradient of the friction force against the pull-off force, which corresponded to the friction coefficient, was 0.021 and 0.14 for the stearic acid and fluoro-carboxylic acid respectively. The pull-off force increased with higher relative humidity on the fluoro-carboxylic acid. We concluded that differences in the pull-off and friction forces between the two kinds of LB films were mainly caused by differences in the stiffness of the LB film.Yasuhisa AndoTakashi IgariShigeyuki MoriJapanese Society of Tribologistsarticlefriction forcepull-off forceradius of curvaturestearic acidfluoro-carboxylic acidafmasperity arrayPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 2, Iss 1, Pp 23-28 (2007)
institution	DOAJ
collection	DOAJ
language	EN
topic	friction force pull-off force radius of curvature stearic acid fluoro-carboxylic acid afm asperity array Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	friction force pull-off force radius of curvature stearic acid fluoro-carboxylic acid afm asperity array Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yasuhisa Ando Takashi Igari Shigeyuki Mori Tribological Properties of LB films Measured under Zero Applied Load
description	We examined the pull-off and friction forces between an atomic force microscope (AFM) probe and submicron-scale asperities covered with Langmuir Blodgett (LB) films. First, we used a focused ion beam to produce several kinds of asperity arrays on two silicon substrates. The average radius of curvature was 95 to 800 nm, depending on the asperity array. An LB film of stearic acid (C17H35COOH) or fluoro-carboxylic acid (C6F13C11H22COOH) was deposited on each substrate. The friction force was measured at each asperity array under a zero applied load. The pull-off force was measured at each asperity array and also at controlled relative humidities of 3 to 73%. The results showed that the pull-off and friction forces were almost proportional to the radius of the curvature of the asperity peak with both stearic acid and fluoro-carboxylic acid LB films. The gradient of the friction force against the pull-off force, which corresponded to the friction coefficient, was 0.021 and 0.14 for the stearic acid and fluoro-carboxylic acid respectively. The pull-off force increased with higher relative humidity on the fluoro-carboxylic acid. We concluded that differences in the pull-off and friction forces between the two kinds of LB films were mainly caused by differences in the stiffness of the LB film.
format	article
author	Yasuhisa Ando Takashi Igari Shigeyuki Mori
author_facet	Yasuhisa Ando Takashi Igari Shigeyuki Mori
author_sort	Yasuhisa Ando
title	Tribological Properties of LB films Measured under Zero Applied Load
title_short	Tribological Properties of LB films Measured under Zero Applied Load
title_full	Tribological Properties of LB films Measured under Zero Applied Load
title_fullStr	Tribological Properties of LB films Measured under Zero Applied Load
title_full_unstemmed	Tribological Properties of LB films Measured under Zero Applied Load
title_sort	tribological properties of lb films measured under zero applied load
publisher	Japanese Society of Tribologists
publishDate	2007
url	https://doaj.org/article/25b6a27def9d4ccfa524aa4b61890732
work_keys_str_mv	AT yasuhisaando tribologicalpropertiesoflbfilmsmeasuredunderzeroappliedload AT takashiigari tribologicalpropertiesoflbfilmsmeasuredunderzeroappliedload AT shigeyukimori tribologicalpropertiesoflbfilmsmeasuredunderzeroappliedload
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Tribological Properties of LB films Measured under Zero Applied Load

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