title: Wetting of graphene oxide: a molecular dynamics study.
abstract: We characterize the wetting properties of graphene oxide by performing classical molecular dynamics simulations. With oxygen-containing functional groups on the basal plane, graphene becomes hydrophilic and the water contact angle decreases with their concentration, c. The concentration dependence displays a transition at c ≈ 11% as defined by the interacting range of hydrogen bonds with oxidized groups and water. Patterns of the oxidized region and the morphological corrugation of the sheet strongly influence the spreading of water droplets with their lateral spans defined by corresponding geometrical parameters and thus can be used to control their behavior on the surface. These results are discussed with respect to relevant applications in graphene oxide-derived functional materials and offer a fundamental understanding of their wetting and flow phenomena.
authors.affiliation: Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University , Beijing 100084, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wei
authors.forename: Cunjing
authors.initials: C
authors.lastname: Lv
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Xu
mesh_terms: D006108:Graphite / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D013499:Surface Properties; D017155:Wettability
chemical_list: D010087:Oxides; D006108:Graphite; D010100:Oxygen