Nanotechnology

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Nanotechnology

  1. 1. Nanotechnology Done by : Andrew Tan [4O101]
  2. 2. Agenda <ul><li>Definition </li></ul><ul><li>Usage </li></ul><ul><li>How their properties change when shrink to nano particles </li></ul>
  3. 3. What is nanotechnology used in?
  4. 4. Definition <ul><li>Nanotechnology is the engineering of matter at the molecular level. </li></ul><ul><li>One nanometer is 10^9 of a meter. </li></ul>
  5. 5. Applications <ul><li>Electronics </li></ul><ul><li>- Nano Transistors </li></ul><ul><li>- Nano Diodes </li></ul><ul><li>- Plasma Displays </li></ul><ul><li>- Quantum Computers </li></ul>
  6. 6. Applications <ul><li>Energy </li></ul><ul><li>- Batteries </li></ul><ul><li>- Fuel Cells </li></ul><ul><li>- Solar Cells </li></ul>
  7. 7. Applications <ul><li>Materials </li></ul><ul><li>- Nano Tubes </li></ul><ul><li>- Aerogel </li></ul><ul><li>- Nano Particles </li></ul>
  8. 8. Neuron Damage <ul><li>A Northwestern University researcher has presented the results of a study in which he injected nanomaterials into the severed spinal cords of mice, allowing them to walk again after several weeks of therapy. </li></ul><ul><li>The nanomaterials he used were designed to self-assemble into nanofibers which repaired damaged neurons. </li></ul>
  9. 9. Neuron Damage <ul><li>The research offers new insights into the near-term research potential of nanotechnology and offers hope for patients with Alzheimer's and Parkinson's who suffer from severe neuron damage. </li></ul>
  10. 10. Cancer Therapy
  11. 11. Nanomaterials <ul><li>Nanomaterials have actually been produced and used by humans for hundreds of years - the beautiful ruby red color of some glass is due to gold nanoparticles trapped in the glass matrix. </li></ul><ul><li>The decorative glaze, found on some medieval pottery, contains metallic spherical nanoparticles dispersed in a complex way in the glaze, which give rise to its special optical properties. </li></ul>
  12. 12. <ul><li>For nanomaterials, the small feature size ensures that many atoms, perhaps half or more in some cases, will be near interfaces. Surface properties such as energy levels, electronic structure, and reactivity can be quite different from interior states, and give rise to quite different material properties. </li></ul>Nanomaterials
  13. 13. Properties of Nanomaterial <ul><li>At the nanomaterial level, some material properties are affected by the laws of atomic physics, rather than behaving as traditional bulk materials do. </li></ul>
  14. 14. Common Nanmaterials
  15. 15. Nanomaterials <ul><li>Nanomaterials have actually been produced and used by humans for hundreds of years - the beautiful ruby red color of some glass is due to gold nanoparticles trapped in the glass matrix. The decorative glaze known as luster, found on some medieval pottery, contains metallic spherical nanoparticles dispersed in a complex way in the glaze, which give rise to its special optical properties. </li></ul>
  16. 16. Nanoparticles <ul><li>The properties of nanoparticles depend on their shape, size, surface characteristics and inner structure. They can change in the presence of certain chemicals. </li></ul>
  17. 17. Nanoparticles <ul><li>Decrease in material flammability has also been studied, an especially important property for transportation applications where choice of material is influenced by safety concerns. </li></ul>
  18. 18. Example <ul><li>Take something no wider than a human hair and shrink it a thousand fold to a few nanometers across, and its electronic and other properties change radically. But whether the crystal structure of these nanoparticles remains basically the same is a matter scientists continue to debate. </li></ul>
  19. 19. Nanoparticles characteristics <ul><li>Nanoparticles are presented as an aerosol (mostly solid or liquid phase in air), a suspension (mostly solid in liquids) or an emulsion (two liquid phases). </li></ul><ul><li>In the presence of chemical agents (surfactants), the surface and interfacial properties may be modified. </li></ul>
  20. 20. Nanoparticles characteristics <ul><li>At the nanoscale, particle-particle interactions are either dominated by weak Van der Waals forces, stronger polar and electrostatic interactions or covalent interactions. </li></ul><ul><li>Depending on the viscosity and polarisability of the fluid, particle aggregation is determined by the interparticle interaction. </li></ul>
  21. 21. Characteristics <ul><li>For nanoparticles suspended in air, charges can be accumulated by physical processes such as glow discharge or photoemission. </li></ul><ul><li>In liquids, particle charge can be stabilised by electrochemical processes at surfaces. </li></ul>
  22. 22. <ul><li>The details of nanoparticle - nanoparticle interaction forces and nanoparticle – fluid interactions are of key importance to describe physical and chemical processes, and the temporal evolution of free nanoparticles. </li></ul>Characteristics
  23. 23. Biblography <ul><li>en.wikipedia.org/wiki/ Nanomaterials </li></ul><ul><li>en.wikipedia.org/wiki/List_of_ nanotechnology _ applications </li></ul><ul><li>www.understandingnano.com/ nanotech - applications .html </li></ul><ul><li>www.understandingnano.com/ nanotech - applications .html </li></ul><ul><li>www. nanomaterials company.com/ </li></ul><ul><li>www.csa.com/discoveryguides/nano/overview.php </li></ul><ul><li>www.csa.com/discoveryguides/nano/overview.php </li></ul><ul><li>www.csa.com/discoveryguides/nano/overview.php </li></ul><ul><li>www.nanomt.com </li></ul><ul><li>www.hindawi.com/journals/jnm </li></ul><ul><li>copublications.greenfacts.org </li></ul><ul><li>ec.europa.eu </li></ul>

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