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

doi:10.1038/ncomms2247

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 journal › Article › peer-review

70 Scopus citations

Abstract

Classical experiments show that the force required to slide liquid drops on surfaces increases with the resting time of the drop, t_rest, 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 t_rest. 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 language	English
Article number	1242
Journal	Nature Communications
Volume	3
DOIs	https://doi.org/10.1038/ncomms2247
State	Published - 1 Dec 2012
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

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AU - Leh, Aisha

AU - Cox, Paris

AU - Bahadur, Prashant

AU - Tadmor, Rafael

AU - Patra, Prabir

AU - Vajtai, Robert

AU - Ajayan, Pulickel M.

AU - Wasnik, Priyanka

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AB - 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.

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Water tribology on graphene

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