De Laval nozzle

Using a supersonic spray, graphene flakes with deformed pentagonal and heptagonal structures stretch on impact and spring into a perfect hexagonal graphene lattice. This opens the way to scale up from the microscopic to large scale applications. Click on image to download. Photo credit: Suman Sinha-Ray. - See more at: http://news.uic.edu/supersonic-spray-delivers-high-quality-graphene-layer#sthash.gqbeyRsd.dpuf
Supersonic spray delivers high-quality graphene layer at low cost