In situ measurements of thin films in bovine serum lubricated contacts using optical interferometry
Language English Country Great Britain, England Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
24398447
DOI
10.1177/0954411913517498
PII: 0954411913517498
Knihovny.cz E-resources
- Keywords
- Total hip replacement, bovine serum, colorimetric interferometry, conformity of surfaces, film thickness, hydrophilicity, hydrophobicity, lubrication, protein formation,
- MeSH
- Adsorption MeSH
- Biomechanical Phenomena MeSH
- Hydrophobic and Hydrophilic Interactions MeSH
- Interferometry methods MeSH
- Hip Prosthesis * MeSH
- Lubricants chemistry MeSH
- Serum chemistry MeSH
- Cattle MeSH
- Wettability MeSH
- Materials Testing methods MeSH
- Animals MeSH
- Check Tag
- Cattle MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Lubricants MeSH
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.
References provided by Crossref.org
Tribological performance of the biological components of synovial fluid in artificial joint implants
