Water tribology on graphene

Hartmann E. N'Guessan, Aisha Leh, Paris Cox, Prashant Bahadur, Rafael Tadmor, Prabir Patra, Robert Vajtai, Pulickel M. Ajayan, Priyanka Wasnik

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Classical experiments show that the force required to slide liquid drops on surfaces increases with the resting time of the drop, trest, and reaches a plateau typically after several minutes. Here we use the centrifugal adhesion balance to show that the lateral force required to slide a water drop on a graphene surface is practically invariant with trest. In addition, the drop's three-phase contact line adopts a peculiar micrometric serrated form. These observations agree well with current theories that relate the time effect to deformation and molecular re-orientation of the substrate surface. Such molecular re-orientation is non-existent on graphene, which is chemically homogenous. Hence, graphene appears to provide a unique tribological surface test bed for a variety of liquid drop-surface interactions.

Original languageEnglish
Article number1242
JournalNature Communications
Volume3
DOIs
StatePublished - 1 Dec 2012
Externally publishedYes

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