Carbon nano tubes


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Carbon nano tubes

  2. 2.  An allotrope of carbon  Allotrope- different structural form of the same element(here carbon)  Fullerene family-entirely made of carbon  Rolled-graphene structures
  3. 3. carbon Diamond Graphite Fullerene
  4. 4.  Diamond-carbon atoms tetrahedrally linked covalent bonds in -3D  Hybridisation- sp3  Non-conductor  Graphite- Hexagonally linked carbon atoms  Hybridisation-sp2  Conductor-as it contains unpaired electrons 3
  5. 5.  They are molecules composed entirely of carbon, which take the form of a hollow sphere, ellipsoid, or tube. Spherical fullerenes are sometimes called buckyballs, while cylindrical fullerenes are called buckytubes or nanotubes.
  6. 6. Spherical in shape .A ball with 32 faces. Of the 32 faces, 12 pentagons and 20 hexagons . Looks exactly like a soccer ball(FOOTBALL)
  7. 7.  Carbon nano tubes- name is derived from their size, since the diameter of a nanotube is of the order of a few nanometers (1/50,000 times the width of a human hair) while they can be up to several centimeters in length
  8. 8. No.of sheets rolled • Single walled-CNT(SWNT) • Multi walled-CNT(MWNT) Direction of rolling • Zig-zag • Arm-chair • Chiral
  9. 9.  SWNT-single sheet of graphene  MWNT- multiple sheets of graphene rolled about a common axis(i.e concentric circles)
  10. 10. ELECTRICAL •The direction of rolling determines the electrical properties •Arm chair- metallic(conducting) •Chiral CNT- semiconducting •Generally CNT-1/3 metallic and 2/3 semiconducting properties in CNT •The band gap is inversely is proportional to its diameter (semiconducting MECHANICAL • The Young's modulus is over 1 Tera Pascal (Larger the young’s modulus, lesser is the stability) •It is stiff as diamond •The estimated tensile strength is 200 Giga Pascal •It is 10 times stronger than steel OPTICAL •Efficiently absorbs- uv,visible and IR rays-used in solar panels •Absorption of electromagnetic waves especially microwaves helps enhancing stealth characteristics of military vehicles &aircrafts
  11. 11.  Textiles-water proof &tear resistant fabrics  Combat jackets/body armour-bullet proof wears  Constructions-CNT bridges replacing steel suspensions  As super-conductors,diodes,transistors  As capacitors-to increase charging ability  BUCKY PAPER-250 times stronger than steel & 10 times lighter than it-used as “Faraday cage” to protect airplanes, electric devices
  12. 12. FIELD OF MEDICINE  Artificial muscles-sufficient contractility  Scaffold materials for osteoblast proliferation and bone formation Other uses:  Air pollution filter  Desalination of water-Reverse Osmosis  POLYETHYLENE+CNT- elastic modulus > 30%  Hydrogen storage 65% by weight