Hydration lubrication: exploring a new paradigm

被引：86

作者：

Gaisinskaya, Anastasya ^{[1
]}

Ma, Liran ^{[1
]}

Silbert, Gilad ^{[1
]}

Sorkin, Raya ^{[1
]}

Tairy, Odeya ^{[1
]}

Goldberg, Ronit ^{[1
]}

Kampf, Nir ^{[1
]}

Klein, Jacob ^{[1
]}

机构：

[1] Weizmann Inst Sci, IL-76100 Rehovot, Israel

来源：

FARADAY DISCUSSIONS | 2012年 / 156卷

基金：

以色列科学基金会; 欧洲研究理事会;

关键词：

MICA SURFACES; POLYMER-CHAINS; FORCES; FRICTION; LAYERS; SHEAR; MECHANISMS; ADSORPTION; PRESSURES; ADHESION;

D O I：

10.1039/c2fd00127f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：217 / 233

页数：17

共 56 条

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[2]

[Anonymous], 1973, Friction: An Introduction to Tribology

[3]

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[4]

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