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Rod-like molecules

Rod-like molecules. Lecture Thursday, 2:00pm This lecture: http://www.staff.uni-mainz.de/gruhn/rods.ppt Some Literature: The physics of Liquid Crystals, 2 nd ed. De Gennes P G, Prost J (New York: Oxford Univ. Press, 1993) ‏

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Rod-like molecules

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  1. Rod-like molecules • Lecture Thursday, 2:00pm • This lecture: http://www.staff.uni-mainz.de/gruhn/rods.ppt • Some Literature: • The physics of Liquid Crystals, 2nd ed.De Gennes P G, Prost J (New York: Oxford Univ. Press, 1993)‏ • Thermotropic Liquid Crystals, Fundamentals G. Vertogen, W. de Jeu (Springer, Berlin, 1988). • The physics of Lyotropic Liquid CrystalsA. M. Figueiredo Neto, S.R.A. Salinas (Oxford Science Publications, 2005)‏ • Bergmann-Schäfer Band 5: Vielteilchensysteme(de Gruyter, Berlin 1992)Abschnitt 6: Flüssigkristalle, G. Heppke, C. Bahr

  2. Rod-like molecules • Liquid crystal molecules • MBBA • 5CB • Rod-like colloids • tobacco-mosaic virus • fd-virus • carbon nanotubes • microtubuli, actin filaments • Amphiphilic molecules • soap • lipids, fat molecules

  3. Rod-like molecules • Liquid crystal molecules • MBBA • 5CB • Rod-like colloids • tobacco-mosaic virus • fd-virus • carbon nanotubes • microtubuli, actin filaments • Amphiphilic molecules • soap • lipids, fat molecules

  4. Rod-like molecules • Liquid crystal moleculesThermotropic liquid crystals: - no solvent - phase depends on P and T • MBBA • 5CB 0.7 nm 0.85 nm 3.4 nm

  5. Simple phase diagram

  6. Liquid crystal phase diagram • 3-5-Gay-Berne model potential, ellipsoidal molecules

  7. Liquid crystal phase diagram • 3-5-Gay-Berne model potential, ellipsoidal molecules

  8. Liquid crystalline phases nematic

  9. Liquid crystalline phases: nemtic cholesteric

  10. Liquid crystalline phases: smectic C, smectic C* Smectic C* cholesteric

  11. Optical Activity polarizer polarizer isotropic fluid nematic fluid polarizer polarizer

  12. Optical Activity nematic droplet dark regions: isotropic light regions nematic growing nematic phase watched between crossed polarizers

  13. Nematic defects

  14. LCDs: Liquid crystal displays

  15. colored LCDs

  16. Rod-like molecules • Liquid crystal molecules • MBBA • 5CB • Rod-like colloids • tobacco-mosaic virus • fd-virus • carbon nanotubes • microtubuli, actin filaments • Amphiphilic molecules • soap • lipids, fat molecules

  17. Rod-like molecules D : diameter L : length LP : persistence length • Rod-like colloidsLyotropic liquid crystals- dissolved in water- depends on c • tobacco-mosaic virusD=18nm, L=300nm, Lp≈1mm • fd-virusD=6.6nm, L=880nm, LP . 800nm • single-walled carbon nanotubes D=1 nm, L≈200nm-10mm, LP =800nm

  18. Rod-like molecules • tobacco mosaic virus

  19. Rod-like molecules • fd-virus

  20. Rod-like molecules • nematic sample of carbon nanotubes

  21. Rod-like molecules • filaments in living cells • actin filaments • microtubuli • lipids in cell membranes

  22. Rod-like molecules D : diameter L : length LP : persistence length • Rod-like colloidsLyotropic liquid crystals- dissolved in water- depends on c • tobacco-mosaic virusD=18nm, L=300nm, Lp≈∞ • fd-virusD=6.6nm, L=880nm, LP . 800nm • single-walled carbon nanotubes D=1 nm, L≈200nm-10mm, LP =800nm • microtubuliL . 50μm, D=25nm, LP = 0.1–5 mm • F-actin filamentsL .6μm, D=10nm, LP = 8.75μm

  23. Rod-like molecules • Liquid crystal molecules • MBBA • 5CB • Rod-like colloids • tobacco-mosaic virus • fd-virus • carbon nanotubes • microtubuli, actin filaments • Amphiphilic molecules • soap • lipids, fat molecules

  24. Soap, lipids, fats Lipid molecule

  25. Phases of amphiphilic molecules

  26. Lipid-Membran Skizze

  27. Vesikel Skizze

  28. Membran glatte Fläche Diskretisierung Simulation of vesicles Giant vesicle

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