Tribology of charged and zwitterionic lipids layer: effect of hydration on structural properties
A stack of hydrated phopsholipid bilayers lubricates biological rubbing surfaces. Its exceptional frictional behavior appears to originate from the confined nanoscopic water layer via the hydration lubrication mechanism. However, other energy dissipation path- ways are plausible. To elucidate the shear of confined lipids, we have developed a system combining Tribology and FRAPP (TriboFRAPP), giving at the same time an insight into the friction and hydrodynamics of the sheared film. We study charged (DPPS) and zwitterionic (DSPC) trilayers deposited on a glass substrate (solid/air interface) which allows us to play on the hydration level. With the TriboFRAPP device, we hope to locate the shear slip plane. The precise measurement of the thickness of the confined water by neutron reflectivity would complete our results by demonstrating the structure/friction relation and would reinforce our data concerning the velocity field obtained with the TriboFRAPP setup. Finally, the structural knowledge of the trilayer would allow us to compare our experimental work with molecular dynamics simulations performed by collaborators working on the same ANR project (ANR Banana_Slip, PRC, AAPG2021).
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charitat; FRAGNETO Giovanna; GARDRE Ludovic; HELSTROFFER Swen; Ben Humphreys; Pierre Muller; Nicoḷ Paracini; ROBERT Camille; SACCUCCI Lucas; SAERBECK Thomas and SAERBECK Thomas. (2023). Tribology of charged and zwitterionic lipids layer: effect of hydration on structural properties. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-13-1058
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