Journal
LANGMUIR
Volume 27, Issue 15, Pages 9413-9417Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la201535x
Keywords
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Funding
- NSFC of China [51021064, 51075227]
- Basic Research Program of Shenzhen [0021539012100521066]
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In present work, a superlubricity phenomenon of phosphoric acid (H3PO4) was found under ambient conditions. An ultralow friction coefficient of about 0.004 between glass/Si3N4 and sapphire/sapphire tribopairs was obtained under the lubrication of a phosphoric acid aqueous solution (pH 1.5) at high contact pressure (the maximum pressure can reach about 1.65 GPa) after a running-in period of about 600 s. The experimental results indicate that the superlow friction state was very stable for more than 3 h. In such a state, solidlike films formed on the two sliding surfaces, which are hydrates of phosphoric acid with a hydrogen-bonded network according to the Raman spectrum. The superlubricity mechanism is mainly attributed to the hydrogen bond effect that forms a hydrated water layer with low shearing strength, and the dipole-dipole effects that form an interfacial Coulomb repulsion force also make some contributions to low friction. This work may help us to introduce a new approach to superlubricity and may lead to the wide application of superlubricity in future technological and biomedical areas.
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