Water tribology on graphene

Hartmann E. N’guessan, Aisha Leh, Paris Cox, Prashant Bahadur, Rafael Tadmor (), Prabir Patra (), Robert Vajtai, Pulickel M. Ajayan and Priyanka Wasnik
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Hartmann E. N’guessan: Lamar University
Aisha Leh: Lamar University
Paris Cox: Rice University
Prashant Bahadur: Lamar University
Rafael Tadmor: Lamar University
Prabir Patra: University of Bridgeport
Robert Vajtai: Rice University
Pulickel M. Ajayan: Rice University
Priyanka Wasnik: Lamar University

Nature Communications, 2012, vol. 3, issue 1, 1-5

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2247

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