Nanochemistry

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Nanochemistry

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Nanochemistry

  1. 1. nanochemistry<br />
  2. 2. What is an allotrope?<br />An allotrope is a different form of the same element.<br />For example, Diamond and Graphite are both allotropes of Carbon.<br />
  3. 3. Diamond: Properties<br />Hard material<br />Strong covalent bonds<br />High melting point<br />No free electrons<br />Doesn’t conduct<br />Insoluble in water<br />Transparent and lustrous<br />Carbon atoms<br />Covalent bonds<br />
  4. 4. Graphite: Properties<br />Soft, slippery material<br />Atoms arranged in layers<br />Weak intermolecular forces<br />Layers slide over each other<br />Free moving electrons between layers<br />Does conduct<br />Used in pencils<br />Black<br />
  5. 5. Fullerenes<br />They are spheres of only carbon atoms and are also allotropes of carbon<br />One example is the Buckminsterfullerene (Buckyball)<br />It has a formula C60<br />It is a black solid<br />Dissolves in petrol to make a<br /> red solution<br />Free moving electrons so conducts electricity<br />
  6. 6. Fullerenes: Uses<br />They can cage other molecules<br />In the future this may be used to deliver drugs in small amounts for slow release.<br />E.g. Cancer treatment<br />
  7. 7. NANOTUBES<br />Nanotubes are made by joining fullerenes together<br />Properties<br />Hexagons curled into a tube shape<br />Very strong<br />Conducts electricity<br />Small with a large surface area<br />Can be separated from liquid products for re-use<br />Uses<br />Reinforce Graphite in tennis racquets<br />Semi conductors in electric circuits in modern computers and electric circuits<br />Industrial catalysts<br />
  8. 8. Semiconducting CdSe Quantum Dots<br />4 nm = 0.000004 mm<br />Colour changes with Size!<br />
  9. 9. Gold Nanoparticles <br /><ul><li>Nanochemistry has old roots
  10. 10. Colloidal Au used in Ancient Roman times
  11. 11. Described by Faraday in 1857 </li></li></ul><li>A<br />Gold Nanoparticles <br /><ul><li>Size control possible by adjusting ratio of HAuCl4 : alkanethiol
  12. 12. Monodispersity can be improved by fractional precipitation</li></ul>3.9 ± 0.6 nm<br />
  13. 13. A<br />B<br />Gold Nanoparticles <br /><ul><li>Size control possible by adjusting ratio of HAuCl4 : alkanethiol
  14. 14. Monodispersity can be improved by fractional precipitation</li></ul>3.9 ± 0.6 nm<br />6.2 ± 1.0 nm<br />
  15. 15. Au<br />Au<br />X<br />CO<br />CO2<br />CO<br />CO2<br />Metal Nanoparticles <br />Chemistry changes with Size!<br />

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