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Carbon Nanotubes

Carbon Nanotubes. Ray Olang. What is it?. History. How are they made?.

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Carbon Nanotubes

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  1. Carbon Nanotubes Ray Olang

  2. What is it?

  3. History

  4. How are they made? • Nanotube formation is allowed because their formation eliminates high-energy dangling bonds and increases strain energy and thus decreasing total energy; the net decrease in energy is what allows the formation of nanotubes along with the addition of energy for the overall reaction.

  5. Yeah, how? • The methods of creating nanotubes are arc discharge, laser ablation, high pressure carbon monoxide, and chemical vapor deposition; most of the methods take place in a vacuum or with process gases.

  6. So What? • Can be metallic or semi-conducting depending on orientation (special gate voltage controlled band gaps) • Light, yet strong (more s-character) • The Young's modulus of the best nanotubes can be as high as 1000 GPa(5x stiffer than steel) • The tensile strength 63 Gpa (50x higher than steel) • Own insulation (multi-walled) • All nanotubes are expected to be very good thermal conductors along the tube, but good insulators laterally to the tube axis. • Concentric • SMALL (3000K limit) • Defects lower conductivity • Current density x1000 Silver

  7. Conclusion • Their mechanical properties and unique properties make them both interesting as well as potentially useful in future technologies. waterproof tear-resistant cloth fibers, combat jackets, high-tensile concrete, increasing polymer elasticity, artificial muscles, chemical nanowires, high-speed flywheels, buckypaper, space elevator, filters, etc

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