Detail publikace
Měření tenkých filmů v kontaktech mazaných hovězím sérem pomocí optické interferometrie
VRBKA, M. KŘUPKA, I. HARTL, M. NÁVRAT, T. GALLO, J. GALANDÁKOVÁ, A.
Český název
Měření tenkých filmů v kontaktech mazaných hovězím sérem pomocí optické interferometrie
Anglický název
In situ measurements of thin films in bovine serum lubricated contacts using optical interferometry
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
The aim of this study is to consider the relevance of in situ measurements of bovine serum film thickness in the optical test device that could be related to the function of the artificial hip joint. It is mainly focussed on the effect of the hydrophobicity or hydrophilicity of the transparent surface and the effect of its geometry. Film thickness measurements were performed using ball-on-disc and lens-on-disc configurations of optical test device as a function of time. Chromatic interferograms were recorded with a high-speed complementary metal-oxide semiconductor digital camera and evaluated with thin film colorimetric interferometry. It was clarified that a chromium layer covering the glass disc has a hydrophobic behaviour which supports the adsorption of proteins contained in the bovine serum solution, thereby a thicker lubricating film is formed. On the contrary, the protein film formation was not observed when the disc was covered with a silica layer having a hydrophilic behaviour. In this case, a very thin lubricating film was formed only due to the hydrodynamic effect. Metal and ceramic balls have no substantial effect on lubricant film formation although their contact surfaces have relatively different wettability. It was confirmed that conformity of contacting surfaces and kinematic conditions has fundamental effect on bovine serum film formation. In the ball-on-disc configuration, the lubricant film is formed predominantly due to protein aggregations, which pass through the contact zone and increase the film thickness. In the more conformal ball-on-lens configuration, the lubricant film is formed predominantly due to hydrodynamic effect, thereby the film thickness is kept constant during measurement.
Český abstrakt
Článek se zabývá měřením tloušťky mazacího filmu v kontaktu těles, které jsou velice blízké reálné konfiguraci hlavice-jamka kyčelního kloubu. Výzkum se zaměřuje zejména na vliv hydrofobicity a hydrofilicity kontaktních ploch a na jejich konformitu.
Anglický abstrakt
The aim of this study is to consider the relevance of in situ measurements of bovine serum film thickness in the optical test device that could be related to the function of the artificial hip joint. It is mainly focussed on the effect of the hydrophobicity or hydrophilicity of the transparent surface and the effect of its geometry. Film thickness measurements were performed using ball-on-disc and lens-on-disc configurations of optical test device as a function of time. Chromatic interferograms were recorded with a high-speed complementary metal-oxide semiconductor digital camera and evaluated with thin film colorimetric interferometry. It was clarified that a chromium layer covering the glass disc has a hydrophobic behaviour which supports the adsorption of proteins contained in the bovine serum solution, thereby a thicker lubricating film is formed. On the contrary, the protein film formation was not observed when the disc was covered with a silica layer having a hydrophilic behaviour. In this case, a very thin lubricating film was formed only due to the hydrodynamic effect. Metal and ceramic balls have no substantial effect on lubricant film formation although their contact surfaces have relatively different wettability. It was confirmed that conformity of contacting surfaces and kinematic conditions has fundamental effect on bovine serum film formation. In the ball-on-disc configuration, the lubricant film is formed predominantly due to protein aggregations, which pass through the contact zone and increase the film thickness. In the more conformal ball-on-lens configuration, the lubricant film is formed predominantly due to hydrodynamic effect, thereby the film thickness is kept constant during measurement.
Klíčová slova česky
Endoprotéza kyčelního kloubu, konformita třecích povrchů, hydrofobicita, hydrofilicita, hovězí sérum, formování proteinů, mazání, tloušťka filmu, kolorimetrická interferometrie
Klíčová slova anglicky
Total hip replacement, conformity of surfaces, hydrophobicity, hydrophilicity, bovine serum, protein formation, lubrication, film thickness, colorimetric interferometry
Rok RIV
2014
Vydáno
07.01.2014
Nakladatel
SAGE Publications Ltd
Místo
Velká Británie
ISSN
0954-4119
Ročník
228
Číslo
2
Strany od–do
149–158
Počet stran
10
BIBTEX
@article{BUT104824,
author="Martin {Vrbka} and Ivan {Křupka} and Martin {Hartl} and Tomáš {Návrat} and Jiří {Gallo},
title="In situ measurements of thin films in bovine serum lubricated contacts using optical interferometry",
year="2014",
volume="228",
number="2",
month="January",
pages="149--158",
publisher="SAGE Publications Ltd",
address="Velká Británie",
issn="0954-4119"
}