Research advances of nano-technology in surface of titanium and changes of biological properties after nano-technology

The development of nano-technology and surface-technology becomes a new technology called nano-technology in surface.Using nano-technology in surface,we are able to make metallic materials not only have surface nanocrystallization,but also macrocrystal basal body.It can improve surface and biological properties of metals with nano-technology in surface.This paper focuses not only on basic principals and methods of nano-technology in surface of metallic materials,but also on surface and biological properties after nano-technology in surface.