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Communication Dans Un Congrès Année : 2010

Analysis of the tribological operation of fluid phase phospholipid biomimetic surfaces

Résumé

The difficulties associated with the rheological characterization of the "biological lubricants" to understand the remarkable tribological performances of biological rubbing contacts, have led to study their molecular composition especially that of molecular interfaces created with biological tissues. Recent studies [Trunfio 2008] have shown the importance of surfactant-type molecules (phospholipid-SAPL) on obtaining molecular surface layers with high mechanical strength and capable of locating the velocity accommodation, leading to a very low friction coefficient. These molecular layers are made of stacks of 3 to 7 SAPL bilayers [Hills 1989], with a thickness of about 5nm each and separated by aqueous layers (a few nm thick, about 150mM ion and pH around 7 in the healthy case). Low friction coefficients are due to the location of the velocity accommodation in the aqueous layers [Klein 2002] and it might be influenced by changes in ion concentrations or pH. This work aims to study the influence of these parameters on the evolution of friction and the degradation of SAPL bilayers during tests carried on an experimental realistic tribological model. This study therefore shows that good nano-mechanical resistance of the SAPL bilayers is essential to obtain low friction. It also suggests that low friction is ensured by ion hydration layers between adjacent SAPL bilayers and that a buffered medium is essential to maintain stable bilayers.
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Dates et versions

hal-00686900 , version 1 (11-04-2012)

Identifiants

  • HAL Id : hal-00686900 , version 1

Citer

Magdalena Corneci, Ana-Maria Trunfio-Sfarghiu, Fairouz Dekkiche, Yves Berthier, Marie-Hélène Meurisse, et al.. Analysis of the tribological operation of fluid phase phospholipid biomimetic surfaces. 'Theoretical modelling and experimental simulations in tribology' meeting, Mar 2010, Cargese, France. ⟨hal-00686900⟩
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