Hydration lubrication: exploring a new paradigm

Autor:	Ronit Goldberg, Nir Kampf, Gilad Silbert, Odeya Tairy, Anastasya Gaisinskaya, Liran Ma, Jacob Klein, Raya Sorkin
Rok vydání:	2012
Předmět:	Aqueous medium Chemical physics Chemistry Lubrication Nanotechnology Mica Physical and Theoretical Chemistry Boundary lubrication
Zdroj:	Faraday Discussions. 156:217
ISSN:	1364-5498 1359-6640
Popis:	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 polyzwitterionic 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bc4c13007302cc700afe14bb8652202 https://doi.org/10.1039/c2fd00127f Zobrazit plný text záznamu