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

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.
Complete list of metadatas

Cited literature [3 references]  Display  Hide  Download

https://hal-ens-lyon.archives-ouvertes.fr/ensl-00182728
Contributor : Patrick Oswald <>
Submitted on : Friday, October 26, 2007 - 8:16:12 PM
Last modification on : Wednesday, October 17, 2018 - 7:48:11 PM
Long-term archiving on : Monday, April 12, 2010 - 12:50:58 AM

File

PopaNitaOswald07.pdf
Publisher files allowed on an open archive

Identifiers

  • HAL Id : ensl-00182728, version 1

Collections

Citation

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, American Institute of Physics, 2007, 127 (10), pp.104702. ⟨ensl-00182728⟩

Share

Metrics

Record views

118

Files downloads

309