Nano Ball Milling
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Nano Ball Milling Presentation Transcript

  • 1. BALL MILLING METHOD By Aravind N. B
  • 2.  Nano materials can be defined as those materials which have structured components with size less than 100nm at least in one dimension. Nanotechnology is an advanced technology, which deals with the synthesis of nano-particles, processing of the nano materials and their applications.
  • 3.  Begin with atoms and molecules(bottom), which react under chemical and physical circumstances to form nanostructure. Eg. Chemical Vapor Deposition(CVD), Atomic Layer Deposition(ALD), Crystal Growth ,etc
  • 4.  Begin with Bulk Materials(Top) that are subsequently reduced into Nanostructures(Down) by the way of physical, chemical and mechanical processes. Eg: Mechanical-ball milling , extrusion, grinding,etc
  • 5.  Ball milling is a method of production of nano materials. This process is used in producing metallic and ceramic nano materials. These mills are equipped with grinding media composed of wolfram carbide or steel. Ball mills rotate around a horizontal axis ,partially filled with the material to be ground plus the grinding medium.
  • 6.  The balls rotate with high energy inside a container and then fall on the solid with gravity force and kinetic and hence crush the solid into nano crystallites.
  • 7.  Generation of curved or closed-shell carbon nanostructures by ball-milling of graphite Carbon scrolls produced by high energy ball milling of graphite Nanoporous carbon produced by ball milling The nucleation and growth of carbon nanotubes in a mechano-thermal process. Carbon nanotubes formed in graphite after mechanical grinding and thermal annealing.
  • 8.  Carbon microspheres produced by high energy ball milling of graphite powder Carbon tubes produced during high- energy ball milling process Highly curved carbon nanostructures produced by ball-milling Low energy pure shear milling: A method for the preparation of graphite nano-sheets
  • 9.  The significant advantage of this method is that it can be readily implemented commercially. Ball milling can be used to make carbon nanotubes and boron nitride nanotubes. It is a preferred method for preparing metal oxide nano crystals like Cerium(CeO2) and Zinc Oxide (ZnO).
  • 10.  Ball milling of graphite under a hydrogen atmosphere is an effective method of producing nanostructured graphite which is able to store an appreciable amount of hydrogen. Nanostructured graphite has potential for use as a low-cost in energy store, for vehicles and stationary hydrogen-energy applications.