What We Do In My Lab


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My 9th Grade Brother asked me what I do in my lab, so I threw together this presentation. I am not sure how much a 9th Grader knows, but I intended this presentation to give him exposure, rather than to have him understand everything. Please feel free to critique my presentation, and certainly point out any pictures that I may have failed to give the original sources credit for.

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What We Do In My Lab

  1. 1. What we do in my lab Optical Materials Source: www.nanotech-now.com/current-uses.htm Source: stm.lbl.gov/Salmeron_group/homeold.html Source: www.godunov.com/bucky/fullerene.html Source: www.aip.org/png/2003/186.htm Source: web.gc.cuny.edu /dept/engineering/ Faissal Source: scienceblogs.com /.../04/pining_for_the_sun.php
  2. 2. We want to make <ul><li>Optical Protection </li></ul><ul><ul><li>For protection from lasers </li></ul></ul><ul><li>Solar Cells </li></ul><ul><ul><li>For making electricity </li></ul></ul>Source: www.howstuffworks.com/solar-cell.htm
  3. 3. What we do: <ul><li>We make nano sized crystals, called quantum dots </li></ul><ul><li>We connect them with carbon nanotubes , which act as wires </li></ul><ul><li>We make plastic films which hold our quantum dots and carbon nanotubes </li></ul><ul><li>We test our films as optical protection , and as solar cells </li></ul>
  4. 4. We start with crystals Source: www.faeriesfinest.com/B947.html Source: commons.wikimedia.org/wiki/File:Rock_salt_crystal.jpg Crystals can look like this: The crystals that we make are nanometers in size! We call these nanocrystals Quantum Dots .
  5. 5. How small is a nanometer? <ul><li>How small is small? </li></ul>Source: http://cobweb.ecn.purdue.edu/~janes/whats_nano.htm
  6. 6. We take Atoms from Salts to make our Quantum Dots Cadmium From Salt Selenium From Salt Cadmium Selenide ( CdSe ) Source: http://www.astro.virginia.edu/class/oconnell/astr121/cosmic-history-narrative.html +
  7. 7. Our Quantum Dots look like this: In the Laboratory: We cannot see our Quantum Dots . Here are the models of our nanocrystals Source: Published online: 25 January 2004; doi:10.1038/nmat1056
  8. 8. Our crystals are so small, they need protection, so they do not get destroyed <ul><li>They are protected by chemicals that are like soap, which cover the crystals </li></ul>Source: Pileni, Marie-Paule, Nature Materials 2, 145–150 (2003)
  9. 9. Quantum Dots are Interesting: <ul><li>Smaller dots look BLUE, and larger dots look RED , under ultra violet light: </li></ul>Source: www.nanotech-now.com/current-uses.htm
  10. 10. We also work with Carbon Nanotubes Source: Mat. Res. [online]. 2008, vol.11, n.3 [cited 2009-07-15], pp. 325-333 Carbon Nanotubes in the Lab Carbon Nanotube Model
  11. 11. Buckyballs! <ul><li>The idea for carbon nanotubes came from balls made of carbon atoms: these balls were called Buckyballs! </li></ul>Source: www.godunov.com/bucky/fullerene.html
  12. 12. Carbon nanotubes look like this: Source: www.aip.org/png/2003/186.htm
  13. 13. We make nanocomposites Source: www.nanotech-now.com/current-uses.htm
  14. 14. We make thin films of plastic, with quantum dots and carbon nanotubes in them <ul><li>This is our machine for making thin films: </li></ul><ul><ul><li>It spins coatings of films, one layer at a time </li></ul></ul>
  15. 15. We test our films using a LASER Source: www.laseroffers.com/what-is-laser/ Source: http://www.rp-photonics.com/lasers.html
  16. 16. We move our films through a focused laser to see how their properties change Source: www.microscopy-uk.org.uk/primer/geomop.htm
  17. 17. We measure changes in: Source: http://www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p028.shtml Refractive Index: Source: http://www.tcd.ie/Physics/opticslab/facilities/z_scan.php Absorption coefficient (using two photon absorption): Source: http://www.hyperzoid.com/csc492/microscopy.html
  18. 18. A little bit about light <ul><li>The Electromagnetic Spectrum: </li></ul>Source: http://www.onpointlasers.com/laser-basics
  19. 19. Getting Light from an Atom Source: https://reich-chemistry.wikispaces.com/422-002+D.+Thibault+and+J.+Brock+Big+Time+Line+Project
  20. 20. Hydrogen Spectra Source: http://www.goiit.com/posts/list/community-shelf-the-bohr-atom-917720.htm
  21. 21. A little bit about LASERS Source: http://www.phy.cuhk.edu.hk/phyworld/articles/laser/laser_e.html Electron transitions in an atom: Schematic Diagram of a Ruby Laser: Comparing laser and ordinary lamplight:
  22. 22. To recap, this is what we do: <ul><li>We make nano sized crystals, called quantum dots </li></ul><ul><li>We connect them with carbon nanotubes , which act as wires </li></ul><ul><li>We make plastic films which hold our quantum dots and carbon nanotubes </li></ul><ul><li>We test our films as optical protection , and as solar cells </li></ul><ul><li>You can see other pictures from my lab here: http://www.flickr.com/photos/faissal_bd/sets/72157621760317409/ </li></ul>