Superhydrophobic Behavior Of Oriented Aligned Carbon Nanotube/graphene Hybrids

Superhydrophobic surfaces are widely found in nature and can be used in engineering fields such as waterproofing,anti-icing,and underwater drag reduction by bionanophobic preparation of superhydrophobic surfaces.It is found that the fundamental reason for the hydrophobicity of superhydrophobic surfaces lies in the micro-and nanostructures on them,and thus it is necessary to investigate the interfacial interaction between liquid droplets and surfaces with nanostructures from the nanoscale.In addition,micro-and nanotechnology has been rapidly developed in recent years,and the application of superhydrophobic surfaces has been extended to the micro-and nanoscale.The investigation of nanodroplet-solid surfaces can provide some theoretical guidance for nanodevice development,inkjet printing,and even the development of macroscopic superhydrophobic surfaces.In this paper,a superhydrophobic structure was designed using two materials,carbon nanotubes and graphene,and the dynamic and static wetting behaviors of nanodroplets on the surface of the structure were investigated by molecular dynamics simulation.In terms of static wetting behavior,the effect of the height and spacing of carbon nanotubes on the wettability of the structure is investigated,and the influence of the structure size parameters on the wetting behavior is found,and the most excellent superhydrophobic structure is found.In terms of dynamic wetting behavior,the impact kinetic behavior of liquid droplets on the surface of this structure is investigated in this paper,including the effects of structural size parameters,impact velocity,and impact angle on the impact behavior.Based on the contact time,recovery coefficient and other parameters,the influence law of droplet impact kinetic behavior on the surface of this structure is investigated,and an excellent superhydrophobic structure under dynamic wetting is found to improve the deficiency of wettability study.In addition,four impact phenomena under vertical are found in this paper,among which the pie bounce phenomenon is almost consistent with those obtained from macroscopic experiments.The length of carbon nanotubes has a great influence on the immersion of the structure as well as the kinetic behavior of the impact,therefore,this paper explores the kinetic behavior of nanodroplet impact on ultra-long carbon nanotube/graphene film based on the above study.Here,the flexible impact behavior under different short carbon nanotubes is found,and the structure is subjected to less force,longer contact time,and less kinetic energy loss of the droplet during the impact in this mode compared to the rigid impact of short fibers.In addition,the carbon nanotube structure is more prone to damage when the nanodroplet is impacted at an inclined angle compared to a vertical impact,with the maximum damage stress around 2 GPa.