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Study of chiral molecular diffusion in anisotropic liquids

Study of chiral molecular diffusion in anisotropic liquids. Karen Allahverdyan and Tigran Galstian. Presented by: K. Allahverdyan karen.allahverdyan.1@ulaval.ca.

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Study of chiral molecular diffusion in anisotropic liquids

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  1. Study of chiral molecular diffusion in anisotropic liquids Karen Allahverdyan and TigranGalstian Presented by: K. Allahverdyan karen.allahverdyan.1@ulaval.ca Center for Optics, Photonics and Laser (COPL),Department of Physics, Engineering Physics and Optics, Laval University,Pav. d’Optique-Photonique, 2375 Rue de la Terrasse, Québec, Canada G1V 0A6

  2. Chirality

  3. The presence of chiral compound in liquids Optical activity In isotropic liquids • Manipulation of light polarization & path • Precise measurement of concentration • Various biomedical applications, drugs … • etc. Periodic structure • 1D photonic crystal • Tunable Bragg gratings • Selective reflection • Etc. In anisotropic liquids Photonic band gap structures Reflective LC displays, thermometers (temperature distribution maps), circular polarizers, dichroic filters& mirrors… Smart windows…

  4. Chiral compound in anisotropic liquids NLC CLC Chiral dopant

  5. Boundary conditions Weak Strong rubbing Chiral dopant Chiral dopant

  6. Chiral droplet in NLC For given materials, the temperature is the major factor acting on the diffusion dynamics. Strong boundary conditions vsWeak boundary conditions

  7. Chiral droplet in NLC 15min 10h 18h Rubbed(strong) 0.5mm Non-rubbed(weak)

  8. r d

  9. The evolution of fringes

  10. Azobenzene droplet in NLC Rubbed(strong) Non-rubbed(weak) 0.5mm

  11. The diffusion dynamics Distribution of azo. concentration The diffusion processes are similar in both cases (strong or weak boundaries) The diffusion is faster in the rubbing direction.

  12. Agglomeration of chiral molecules

  13. Conclusion • The diffusion of chiral molecules in anisotropic liquids is different then in isotropic liquids. • The boundary conditions can be used to control the diffusion dynamics in anisotropic liquids. • The differences and the possibility of control is due to collective organizing tendency of liquid crystals.

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