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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 • 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
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
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
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
Liquid crystal phase diagram • 3-5-Gay-Berne model potential, ellipsoidal molecules
Liquid crystal phase diagram • 3-5-Gay-Berne model potential, ellipsoidal molecules
Liquid crystalline phases nematic
Liquid crystalline phases: smectic C, smectic C* Smectic C* cholesteric
Optical Activity polarizer polarizer isotropic fluid nematic fluid polarizer polarizer
Optical Activity nematic droplet dark regions: isotropic light regions nematic growing nematic phase watched between crossed polarizers
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
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
Rod-like molecules • tobacco mosaic virus
Rod-like molecules • fd-virus
Rod-like molecules • nematic sample of carbon nanotubes
Rod-like molecules • filaments in living cells • actin filaments • microtubuli • lipids in cell membranes
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
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
Soap, lipids, fats Lipid molecule
Lipid-Membran Skizze
Vesikel Skizze
Membran glatte Fläche Diskretisierung Simulation of vesicles Giant vesicle