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C11 Liquid Crystals (HL)

C11 Liquid Crystals (HL). C11.1 Identify molecules that are likely to show liquid-crystal properties, and explain their liquid-crystal behavior on a molecular level. C11.2 Describe and explain in molecular terms the workings of a twisted nematic liquid crystal

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C11 Liquid Crystals (HL)

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  1. C11 Liquid Crystals (HL) C11.1 Identify molecules that are likely to show liquid-crystal properties, and explain their liquid-crystal behavior on a molecular level. C11.2 Describe and explain in molecular terms the workings of a twisted nematic liquid crystal C11.3 Describe the liquid-crystal properties of Kevlar, and explain its strength and its solubility in concentrated sulfuric acid.

  2. C11.1 Identify molecules that are likely to show liquid-crystal properties, and explain their liquid-crystal behavior on a molecular level. • Molecules that display liquid crystal behavior • biphenyl nitriles • Nitrile groups make molecules polar • Biphenyl groups have rigid rod shaped structures • Long alkaline chains ensure molecule spacing

  3. C11.2 Describe and explain in molecular terms the workings of a twisted nematic liquid crystal • Twisted Nematic Liquid crystals are the basics of LCD Displays • Composition of LCD Screen • Polarizing filter • Glass layer • electrodes • Liquid crystal layer • electrodes • Glass layer • Polarizing filter • Helix Structure of liquid crystals

  4. C11.3 Describe the liquid-crystal properties of Kevlar, and explain its strength and its solubility in concentrated sulfuric acid. • Kevlar is lyotropic liquid crystal • Within Kevlar Molecules are Hydrogen Bonds • Kevlar molecules form strong ring like structures • Kevlar has a rod-like shape • Kevlar molecules form extra hydrogen bonds between molecules

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