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Relationship between wettability and lubrication characteristics of the surfaces of contacting phospholipid-based membranes.
- Source :
-
Cell biochemistry and biophysics [Cell Biochem Biophys] 2013 Apr; Vol. 65 (3), pp. 335-45. - Publication Year :
- 2013
-
Abstract
- The wettability of the articular surface of cartilage depends on the condition of its surface active phospholipid overlay, which is structured as multi-bilayer. Based on a hypothesis that the surface of cartilage facilitates the almost frictionless lubrication of the joint, we examined the characteristics of this membrane surface entity in both its normal and degenerated conditions using a combination of atomic force microscopy, contact angle measurement, and friction test methods. The observations have led to the conclusions that (1) the acid-base equilibrium condition influences the lubrication effectiveness of the surface of cartilage and (2) the friction coefficient is significantly dependent on the hydrophobicity of the surface of the tissue, thereby confirming the hypothesis tested in this paper. Both wettability angle and interfacial energy were obtained for varying conditions of the cartilage surface both in its wet, dry and lipid-depleted conditions. The interfacial energy also increased with mole fraction of the lipid species reaching an asymptotic value after 0.6. Also, the friction coefficient was found to decrease to an asymptotic level as the wettability angle increased. The result reveal that the interfacial energy increased with pH till pH = 4.0, and then decreased from pH = 4.0 to reach equilibrium at pH = 7.0.
- Subjects :
- Animals
Cartilage, Articular chemistry
Cartilage, Articular metabolism
Cattle
Cell Membrane chemistry
Friction
Hydrogen-Ion Concentration
Knee Joint
Lubrication
Microscopy, Atomic Force
Phosphatidylethanolamines chemistry
Phosphatidylethanolamines metabolism
Phospholipids metabolism
Surface Properties
Cell Membrane metabolism
Phospholipids chemistry
Wettability
Subjects
Details
- Language :
- English
- ISSN :
- 1559-0283
- Volume :
- 65
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Cell biochemistry and biophysics
- Publication Type :
- Academic Journal
- Accession number :
- 23099644
- Full Text :
- https://doi.org/10.1007/s12013-012-9437-z