Surface tension and capillary waves at the nematic-isotropic interface in ternary mixtures of liquid crystal, colloids, and impurities - Archive ouverte HAL Access content directly
Journal Articles Journal of Chemical Physics Year : 2007

Surface tension and capillary waves at the nematic-isotropic interface in ternary mixtures of liquid crystal, colloids, and impurities

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Vlad Popa Nita
  • Function : Author
  • PersonId : 843831
Patrick Oswald
  • Function : Author
  • PersonId : 835867

Abstract

In mixtures of thermotropic liquid crystals with spherical poly(methyl methacrylate) particles, self-supporting networklike structures are formed during slow cooling past the isotropic-to-nematic phase transition. Experimental results support the hypothesis that a third component, alkane remnants slowly liberated from the particles, plays a crucial role. A theoretical model, based on the phenomenological Landau-de Gennes, Carnahan-Starling, and hard-sphere crystal theories, is developed to describe the continuous phase separation in a ternary nematic-impurity-colloid mixture. The interfacial tension and the dispersion relation of the surface modes of the nematic-isotropic interface are determined. The colloids decrease the interfacial tension and the damping rate of surface waves, whereas impurities act in an opposite way. This should strongly influence the formation of abovementioned networklike structures and could help explain some of their rheological properties.
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Dates and versions

ensl-00182728 , version 1 (26-10-2007)

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  • HAL Id : ensl-00182728 , version 1

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Vlad Popa Nita, Patrick Oswald. Surface tension and capillary waves at the nematic-isotropic interface in ternary mixtures of liquid crystal, colloids, and impurities. Journal of Chemical Physics, 2007, 127 (10), pp.104702. ⟨ensl-00182728⟩
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