Thermophoretically driven water droplets on graphene and boron nitride surfaces
Rakesh Rajegowda (Indian Institute of Technology Madras)
Sridhar Kumar Kannam (Royal Melbourne Institute of Technology University, Swinburne University of Technology)
Remco Hartkamp (TU Delft - Process and Energy)
Sarith P. Sathian (Indian Institute of Technology Madras)
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Abstract
We investigate thermally driven water droplet transport on graphene and hexagonal boron nitride (h-BN) surfaces using molecular dynamics simulations. The two surfaces considered here have different wettabilities with a significant difference in the mode of droplet transport. The water droplet travels along a straighter path on the h-BN sheet than on graphene. The h-BN surface produced a higher driving force on the droplet than the graphene surface. The water droplet is found to move faster on h-BN surface compared to graphene surface. The instantaneous contact angle was monitored as a measure of droplet deformation during thermal transport. The characteristics of the droplet motion on both surfaces is determined through the moment scaling spectrum. The water droplet on h-BN surface showed the attributes of the super-diffusive process, whereas it was sub-diffusive on the graphene surface.