Publication detail
In situ measurements of thin films in bovine serum lubricated contacts using optical interferometry
VRBKA, M. KŘUPKA, I. HARTL, M. NÁVRAT, T. GALLO, J. GALANDÁKOVÁ, A.
Czech title
Měření tenkých filmů v kontaktech mazaných hovězím sérem pomocí optické interferometrie
English title
In situ measurements of thin films in bovine serum lubricated contacts using optical interferometry
Type
journal article in Web of Science
Language
en
Original abstract
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.
Czech abstract
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.
English abstract
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.
Keywords in Czech
Endoprotéza kyčelního kloubu, konformita třecích povrchů, hydrofobicita, hydrofilicita, hovězí sérum, formování proteinů, mazání, tloušťka filmu, kolorimetrická interferometrie
Keywords in English
Total hip replacement, conformity of surfaces, hydrophobicity, hydrophilicity, bovine serum, protein formation, lubrication, film thickness, colorimetric interferometry
RIV year
2014
Released
07.01.2014
Publisher
SAGE Publications Ltd
Location
Velká Británie
ISSN
0954-4119
Volume
228
Number
2
Pages from–to
149–158
Pages count
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"
}