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Institut Jožef Stefan, Ljubljana (IJS)
  • Waves at the nematic-isotropic interface : thermotropic nematogen-non-nematogen mixtures
    Popa-Nita, Vlad Dumitru ; Sluckin, T. J. ; Kralj, Samo
    We develop a theory for surface modes at the nematic-isotropic interface in thermotropic nematogen-nonnematogen mixtures. We employ the dynamical generalization of the Landau-de Gennes model for the ... orientational (nonconserved) order parameter, coupled with the Cahn-Hilliard equation for concentration (conserved parameter), and include hydrodynamic degrees of freedom. The theory uses a generalized form of the Landau-de Gennes free-energy density to include the coupling between the concentration of the non-nematogen fluid and the orientational order parameter. Two representative phase diagrams are shown. The method of matched asymptotic expansions is used to obtain a generalized dispersion relation. Further analysis is made in particular cases. Orientational order parameter relaxation dominates in the short-wavelength limit, while in the long-wavelength limit viscous damping processes become important. There is an intermediate region (depending on the temperature) in which the interaction between conserved parameter dynamics and hydrodynamics is important.
    Vir: Physical review. E. - ISSN 1063-651X (71, 2005, str. 061706-1-061706-13)
    Vrsta gradiva - članek, sestavni del ; neleposlovje za odrasle
    Leto - 2005
    Jezik - angleški
    COBISS.SI-ID - 14082312

vir: Physical review. E. - ISSN 1063-651X (71, 2005, str. 061706-1-061706-13)

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