Liquid crystal

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Liquid crystal

  1. 1. Liquid Crystals<br />Sarah Vaccaro<br />
  2. 2. history<br /><ul><li>Discovered in 1888 by Reinitzer and Lehmann
  3. 3. Observed two melting points in cholesteryl benzoate</li></li></ul><li>What is a liquid crystal?<br /><ul><li>A liquid crystal has properties of both a liquid and solid crystal
  4. 4. Flows like a liquid
  5. 5. Molecules aligned in a regular pattern like a crystal</li></li></ul><li>Properties<br /><ul><li>Anisotropy: Specific properties of the material change depending on the orientation of its molecules
  6. 6. Molecular orientation changed by applying an electric field
  7. 7. Birefringence: double refraction of light</li></li></ul><li>Structure: phases of liquid crystals<br /><ul><li>Cholesteric/Chiral Nematic
  8. 8. Nematiclayers, each at a slight rotation to the next
  9. 9. Smectic
  10. 10. Molecules point in same direction, also arrange into layers
  11. 11. Nematic
  12. 12. No positional order, but molecules point in same direction</li></li></ul><li>Current Applications of liquid crystals<br /><ul><li>LCD Screens
  13. 13. Liquid Crystal Thermometers
  14. 14. Body Temperature Imaging
  15. 15. Mood Rings
  16. 16. Battery Charge Indicators
  17. 17. Kevlar</li></li></ul><li>HOW do lcdscreens work?<br />
  18. 18. Future applications<br /><ul><li>Smart Windows
  19. 19. 3-D Displays
  20. 20. Synthesized biological membranes
  21. 21. More imaging applications</li></li></ul><li>sources<br />http://plc.cwru.edu/tutorial/enhanced/files/lc/intro.htm<br />http://www.kth.se/fakulteter/_TFY/kmf/lcd/lcd~1.htm<br />http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=16378837<br />http://www.colorado.edu/physics/2000/laptops/polarizing.html<br />http://dept.kent.edu/spie/liquidcrystals/intro.html#what<br />http://nobelprize.org/educational/physics/liquid_crystals/history/<br />http://en.wikipedia.org/wiki/Liquid_crystal<br />http://plc.cwru.edu/tutorial/enhanced/files/lc/biref/biref.htm<br />

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