1H nuclear magnetic resonance of a ferroelectric liquid crystalline system

J. K. Cha, K. W. Lee, I. H. Oh, J. H. Han, Cheol Eui Lee, J. I. Jin, J. Y. Cho

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We used 1H nuclear magnetic resonance (NMR) to study the phase transitions and molecular dynamics in a characteristic ferroelectric liquid crystal with a carbon number n = 7, S-2 methylbutyl 4-n-heptyloxybiphenyl- 4'-carboxylate (C7). The results were compared with those of our recent work on S-2-methylbutyl 4-n-octanoyloxybiphenyl- 4'-carboxylate (C8), with a carbon number n = 8. While the recrystallization and isotropic phase transitions exhibited a first-order nature in the 1H NMR spin-lattice and spin-spin relaxation measurements, a second-order nature was shown at the Sm-A - Sm-C* liquid crystalline phase transition. A soft-mode anomaly arising from the tilt angle amplitude fluctuation of the director, of which only a hint had been noticed in the C8 system, was manifested in the C7 system at this transition.

Original languageEnglish
Pages (from-to)61-63
Number of pages3
JournalJournal of Magnetics
Volume15
Issue number2
DOIs
Publication statusPublished - 2010 Sep 27

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Keywords

  • Ferroelectric liquid crystalline system
  • Nuclear magnetic resonance
  • Phase transitions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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