Reduction of friction stress of ethylene glycol by attached hydrogen ions

被引：30

作者：

Li, Jinjin ^{[1
]}

Zhang, Chenhui ^{[1
,2
]}

Deng, Mingming ^{[1
]}

Luo, Jianbin ^{[1
]}

机构：

[1] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

[2] Univ Shenzhen, Res Inst, Shenzhen Key Lab Micronano Mfg, Shenzhen 518057, Peoples R China

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

基金：

中国博士后科学基金;

关键词：

SUPERLUBRICITY; WATER; LUBRICATION; MIXTURES;

D O I：

10.1038/srep07226

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In the present work, it is shown that the friction stress of ethylene glycol can decrease by an order of magnitude to achieve superlubricity if there are hydrogen ions attached on the friction surfaces. An ultra-low friction coefficient (mu = 0.004) of ethylene glycol between Si3N4 and SiO2 can be obtained with the effect of hydrogen ions. Experimental result indicates that the hydrogen ions adsorbed on the friction surfaces forming a hydration layer and the ethylene glycol in the contact region forming an elastohydrodynamic film are the two indispensable factors for the reduction of friction stress. The mechanism of superlubricity is attributed to the extremely low shear strength of formation of elastohydrodynamic film on the hydration layer. This finding may introduce a new approach to reduce friction coefficient of liquid by attaching hydrogen ions on friction surfaces.

引用

页数：6

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