Nanofibers are defined as fibers with diameters less than 100 nanometers. They are produced by nterfacial polymerization and electrospinning. They have Low density, large surface area to mass, high pore volume, and tight pore size which make the nanofiber nonwoven appropriate for a wide range of applications from medical to to high-tech and aerospace, capacitors, transistors, drug delivery systems, battery separators, energy storage, fuel cells, and information technology.