Journal
NATURE COMMUNICATIONS
Volume 3, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms2247
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Funding
- National Science Foundation [DMR-0619458, CBET-0960229]
- STLE Houston Section
- NASA through the GSRP programme [NNX10AL39H]
- Office of Naval Research through the MURI programme on Functionalized Nanoscale Graphene [WFUHS10473]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0960229] Funding Source: National Science Foundation
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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.
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