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Lubricants, Volume 7, Issue 8 (August 2019)
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Cover Story (view full-size image) Superlubricity is a highly sought-after state of vanishing friction, which has only been identified [...] Read more. Superlubricity is a highly sought-after state of vanishing friction, which has only been identified in a very limited number of material systems. In this contribution, sodium chloride nanoparticles on graphite are revealed as a new material system for superlubricity. By applying nanomanipulation techniques to the particles, sublinear friction vs. area scaling is found, which is widely regarded as a defining key characteristic of superlubricity. Detailed analysis linked the two branches of scaling behavior to the interface conditions of the particles, which can either be amorphous or polycrystalline. View this paper