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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
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 molecules2
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 molecules3
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 molecules4
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
Liquid crystal phase diagram
  • 3-5-Gay-Berne model potential, ellipsoidal molecules
liquid crystal phase diagram7
Liquid crystal phase diagram
  • 3-5-Gay-Berne model potential, ellipsoidal molecules
optical activity
Optical Activity

polarizer

polarizer

isotropic fluid

nematic fluid

polarizer

polarizer

optical activity12
Optical Activity

nematic droplet

dark regions:

isotropic

light regions

nematic

growing nematic phase

watched between crossed polarizers

rod like molecules16
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 molecules17
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 molecules18
Rod-like molecules
  • tobacco mosaic virus
rod like molecules20
Rod-like molecules
  • nematic sample of carbon nanotubes
rod like molecules21
Rod-like molecules
  • filaments in living cells
    • actin filaments
    • microtubuli
  • lipids in cell membranes
rod like molecules22
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 molecules23
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
Soap, lipids, fats

Lipid molecule

vesikel
Vesikel

Skizze

simulation of vesicles

Membran

glatte Fläche

Diskretisierung

Simulation of vesicles

Giant vesicle