Phase diagrams of binary mixtures of hard rods in an external orientational field

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Abstract

We study a binary mixture of hard spherocylinders with the same diameter (D) and different length (L2 > L1) in the absence and presence of a static external electric (magnetic) field on the basis of the Onsager theory. In the zero field, we find that the usual isotropic-nematic phase transition takes place only between the length ratio (L2/L1) of 1-2.9, the reentrant phenomenon occurs for L2/L1 ≥ 2.7, and the nematic-nematic phase transition starts to be stable for L2/L1 > 2.9. In the external field, the isotropic-nematic transition is replaced by a weakly ordered nematic-nematic transition. The increasing external field strength shifts the transition towards lower densities and narrows the density gap terminating the first order transition at a critical point. The critical field strength is found to increase rapidly with increasing length ratio.

Original languageEnglish
Pages (from-to)1955-1959
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume2
Issue number9
DOIs
Publication statusPublished - May 1 2000

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Binary mixtures
binary mixtures
Phase diagrams
rods
Phase transitions
phase diagrams
Magnetic fields
field strength
stopping
critical point
shift
magnetic fields

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Phase diagrams of binary mixtures of hard rods in an external orientational field. / Varga, S.; Szalai, I.

In: Physical Chemistry Chemical Physics, Vol. 2, No. 9, 01.05.2000, p. 1955-1959.

Research output: Contribution to journalArticle

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