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Liquid crystal

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Phys 121 Presentation

Phys 121 Presentation

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Transcript

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