TY - JOUR
T1 - Hydration lubrication
T2 - Exploring a new paradigm
AU - Gaisinskaya, Anastasya
AU - Ma, Liran
AU - Silbert, Gilad
AU - Sorkin, Raya
AU - Tairy, Odeya
AU - Goldberg, Ronit
AU - Kampf, Nir
AU - Klein, Jacob
N1 - European Research Council; Israel Science Foundation; Charles W. McCutchen FoundationWe thank Y. Barenholz and his colleagues for providing liposomes (R. Sorkin et al.<SUP>57</SUP>), and S. Armes for providing macroinitiator (O. Tairy et al.<SUP>50</SUP>). The European Research Council (Advanced Grant), the Israel Science Foundation and the Charles W. McCutchen Foundation are thanked for their financial support.
PY - 2012
Y1 - 2012
N2 - Lubrication by hydration shells that surround, and are firmly attached to, charges in water, and yet are highly fluid, provide a new mode for the extreme reduction of friction in aqueous media. We report new measurements, using a mica surface-force balance, on several different systems which exhibit hydration lubrication, extending earlier studies significantly to shed new light on the nature and limits of this mechanism. These include lubrication by hydrated ions trapped between charged surfaces, and boundary lubrication by surfactants, by poly-zwitterionic brushes and by close-packed layers of phosphatidylcholine vesicles. Sliding friction coefficients as low as 10 -4 or even lower, and mean contact pressures of up to 17 MPa or higher are indicated. This suggests that the hydration lubrication mechanism may underlie low-friction sliding in biological systems, in which such pressures are rarely exceeded.
AB - Lubrication by hydration shells that surround, and are firmly attached to, charges in water, and yet are highly fluid, provide a new mode for the extreme reduction of friction in aqueous media. We report new measurements, using a mica surface-force balance, on several different systems which exhibit hydration lubrication, extending earlier studies significantly to shed new light on the nature and limits of this mechanism. These include lubrication by hydrated ions trapped between charged surfaces, and boundary lubrication by surfactants, by poly-zwitterionic brushes and by close-packed layers of phosphatidylcholine vesicles. Sliding friction coefficients as low as 10 -4 or even lower, and mean contact pressures of up to 17 MPa or higher are indicated. This suggests that the hydration lubrication mechanism may underlie low-friction sliding in biological systems, in which such pressures are rarely exceeded.
UR - http://www.scopus.com/inward/record.url?scp=84863691798&partnerID=8YFLogxK
U2 - https://doi.org/10.1039/c2fd00127f
DO - https://doi.org/10.1039/c2fd00127f
M3 - مقالة
SN - 1359-6640
VL - 156
SP - 217
EP - 233
JO - Faraday Discussions
JF - Faraday Discussions
ER -