Krysta Boccuzzi
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Effect of Carbon Nanotubes on Chirality in Liquid Crystals

Effect of Carbon Nanotubes on Chirality in Liquid Crystals



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Krysta Boccuzzi Presentation Transcript

  • 1. KRYSTA BOCCUZZI, RAJ BASU, CHARLES ROSENBLATT Effect of Carbon Nanotubes on Chirality in Liquid Crystals
  • 2. Outline
    • Introduction to Liquid Crystals and Carbon Nanotubes
    • Method
    • 8S5 and Carbon Nanotubes
    • Could this be the result of an artifact?
    • Conclusions
  • 3. Introduction to Liquid Crystals Nematic Smectic A Smectic C A liquid crystal is chiral when the mirror image of the molecule cannot be superimposed on the molecule. Liquid crystals have properties between those of liquids and solids.
  • 4. Introduction to Carbon Nanotubes
    • The liquid crystal anchors at the surface of the carbon nanotubes.
    • The axis of the nanotube aligns along the director.
  • 5. The Electroclinic Effect 𝜽 The electroclinic effect only occurs when the liquid crystal is chiral.
  • 6. Cell Preparation
    • Indium Tin Oxide (ITO) coated glass was spin coated with RN1175.
    • The liquid crystal and nanotube mixture was made by dispersing the nanotubes in acetone, shaking them in a vortex mixer for 15 minutes, and sonicating them for 2 hours.
    • The cell was filled in the nematic phase and cooled to the Smectic A phase.
    ITO coating alignment polymer glass rubbing direction rubbing direction
  • 7. Experimental set-up Laser Polarizer (22.5° from director) Analyzer Lens Sample Detector Digital Multimeter Lock-in Amplifier Function generator Computer
  • 8. 8S5 and Carbon Nanotubes
  • 9. Could this be the result of an artifact?
    • Chemical analysis by the manufacturer showed no chiral impurities.
    • Washed in acetone.
    • Washed in toluene.
  • 10. Conclusions
    • The carbon nanotubes transfer chirality to the liquid crystal.
    • Future work will focus on finding the cause of this chirality.