Superhydrophobic Lubrication: Gas–Liquid Bilayer Reduces the Friction Between Two Solids

Heikki A. Nurmi, Cunming Yu, Dmytro Toptunov, Robin H.A. Ras*, Ville Jokinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Lubrication is one of the most important ways to reduce the effect of friction, which is the single largest cause for energy losses in society. Typically, friction reduction is done by lubrication with petroleum-based oils, while technology focus is shifting toward environmentally-friendly green lubrication. Lowest friction coefficients with water-based lubrication have previously been achieved with smooth surfaces such as silicon carbide and silicon nitride or polyzwitterionic polymer brushes with typical coefficients of friction in the order of 0.002. Here, a novel concept for green lubrication using a bilayer of water and ambient air acting as the lubricant between a hydrophilic and superhydrophobic surface is shown. This method achieves superlubricity with friction coefficients down to 0.002 as measured with oscillating tribometer and tilting stage. In addition, possible applications for superhydrophobic lubrication such as tunable lubrication and a 2D mouse treadmill, are shown.

Original languageEnglish
Article number2102132
Number of pages8
JournalAdvanced Materials Interfaces
Issue number5
Early online date5 Jan 2022
Publication statusPublished - 14 Feb 2022
MoE publication typeA1 Journal article-refereed


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