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We report here a fully atomistic molecular dynamics study on the dynamics ofimpact of water nanodroplets (100 {\AA} of diameter) at high velocities (from 1up to 15 {\AA}/ps) against graphene targets. Our results show that tuninggraphene wettability (through parameter changes) significantly affects thestructural and dynamical aspects of the nanodroplets. We identified threeranges of velocities with distinct characteristics, from simple deposition ofthe droplet to spreading with rebound, and finally droplet fragmentation. Wealso identify that in an intermediary velocity of 7 {\AA}/ps, the pattern ofspreading critically changes, due to formation of voids on droplet structure.These voids affect in a detrimental way the droplet spreading on the lesshydrophilic surface, as it takes more time to the droplet recover from thespreading and to return to a semi-spherical configuration. When the velocity isincreased to values larger than 11 {\AA}/ps, the droplet fragments, whichreveals the maximum possible spreading.

Influence of Graphene Wettability on Spreading Patterns of Nanodroplets Impacting at High Speed