**4. Concluding remarks**

 A number of factors may be used to affect, control, and tune the wettability of nanomaterials. There is immense potential for creating materials with designer characteristics tailored to specific applications. The influence of wetting characteristics, including contact angles, chemical composition of nanosurfaces, and surface roughness on the flow behavior of water, aqueous solutions, and polymers, is being investigated for water filtration, desalination, dispersion in polymers, etc. The contact angle of graphene with water has been found to depend upon doping, concentration of defects, temperature, electric field, surface wrinkle morphology, tensile, and vibrational strains. Nanoscale wetting investigations on materials, e.g., CNTs, graphene, nanochannels, membranes, and nanostructures represent an area of intense theoretical as well as experimental research activity.
