The behaviour of the interfacial surface tension of liquid-crystal materials in the vicinity of the nematic-isotropic phase transition

C. Carboni, S. Al-Ruzaiqi, A. Al-Siyabi, S. Al-Harthi, A. K. George, T. J. Sluckin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The behaviour of the interfacial surface tension of nematics near the nematic-isotropic phase transition has been investigated by several researchers. However, the observations reported by the various authors appear to be inconsistent. The present work is an attempt to identify the causes of such inconsistencies. A detailed study of the behaviour of the interfacial surface tension of 5CB by two different techniques (pendant drop and sessile drop) as well as optical observations of the surface of the drop near the nematic-isotropic transitions is presented. Our observations would indicate that close to the transition the phase at the surface may not be uniform; some areas on the surface appear to be fluctuating between the isotropic and the nematic phase. These fluctuations occur at temperatures corresponding to the range between the spinodal points.

Original languageEnglish
Pages (from-to)114-126
Number of pages13
JournalMolecular Crystals and Liquid Crystals
Volume494
DOIs
Publication statusPublished - Dec 2 2008

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Liquid Crystals
Liquid crystals
Surface tension
interfacial tension
Phase transitions
liquid crystals
causes
Temperature
temperature

Keywords

  • 5CB
  • Nematic-air interface
  • Pendant drop
  • Sessile drop
  • Surface tension

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Science(all)

Cite this

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T1 - The behaviour of the interfacial surface tension of liquid-crystal materials in the vicinity of the nematic-isotropic phase transition

AU - Carboni, C.

AU - Al-Ruzaiqi, S.

AU - Al-Siyabi, A.

AU - Al-Harthi, S.

AU - George, A. K.

AU - Sluckin, T. J.

PY - 2008/12/2

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N2 - The behaviour of the interfacial surface tension of nematics near the nematic-isotropic phase transition has been investigated by several researchers. However, the observations reported by the various authors appear to be inconsistent. The present work is an attempt to identify the causes of such inconsistencies. A detailed study of the behaviour of the interfacial surface tension of 5CB by two different techniques (pendant drop and sessile drop) as well as optical observations of the surface of the drop near the nematic-isotropic transitions is presented. Our observations would indicate that close to the transition the phase at the surface may not be uniform; some areas on the surface appear to be fluctuating between the isotropic and the nematic phase. These fluctuations occur at temperatures corresponding to the range between the spinodal points.

AB - The behaviour of the interfacial surface tension of nematics near the nematic-isotropic phase transition has been investigated by several researchers. However, the observations reported by the various authors appear to be inconsistent. The present work is an attempt to identify the causes of such inconsistencies. A detailed study of the behaviour of the interfacial surface tension of 5CB by two different techniques (pendant drop and sessile drop) as well as optical observations of the surface of the drop near the nematic-isotropic transitions is presented. Our observations would indicate that close to the transition the phase at the surface may not be uniform; some areas on the surface appear to be fluctuating between the isotropic and the nematic phase. These fluctuations occur at temperatures corresponding to the range between the spinodal points.

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