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

Fingerprint

Ferroelectric materials
Phase transitions
Nuclear magnetic resonance
Crystalline materials
nuclear magnetic resonance
Liquids
Carbon
liquids
carboxylates
Liquid Crystals
Liquid crystals
Molecular dynamics
carbon
liquid crystals
anomalies
molecular dynamics

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

Cite this

1H nuclear magnetic resonance of a ferroelectric liquid crystalline system. / Cha, J. K.; Lee, K. W.; Oh, I. H.; Han, J. H.; Lee, Cheol Eui; Jin, J. I.; Cho, J. Y.

In: Journal of Magnetics, Vol. 15, No. 2, 27.09.2010, p. 61-63.

Research output: Contribution to journalArticle

Cha, J. K. ; Lee, K. W. ; Oh, I. H. ; Han, J. H. ; Lee, Cheol Eui ; Jin, J. I. ; Cho, J. Y. / 1H nuclear magnetic resonance of a ferroelectric liquid crystalline system. In: Journal of Magnetics. 2010 ; Vol. 15, No. 2. pp. 61-63.
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AU - Oh, I. H.

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AU - Lee, Cheol Eui

AU - Jin, J. I.

AU - Cho, J. Y.

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AB - 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.

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