Nano materials having large surface area, uniform dimensions or pores can be utilized in various membrane applications. Recently, many studies have been focused on the application of nano materials and nano technologies in membrane applications by the help of the discovery and development of nano technologies. in terms of mass transport channels or functional modification. However, there have been several technological limitations for commercialization. Nano materials and nano technologies can improve 1) permeability, selectivity, 2) mechanical, chemical, thermal stability or fouling tolerance of conventional membranes and even 3) introduce new functionalities such as specific affinity and reactivity.