H-1 Nuclear Magnetic Resonance of a Ferroelectric Liquid Crystalline System
- Authors
- Cha, J. K.; Lee, K. W.; Oh, I. H.; Han, J. H.; Lee, Cheol Eui; Jin, J-I; Choi, J. Y.
- Issue Date
- 6월-2010
- Publisher
- KOREAN MAGNETICS SOC
- Keywords
- nuclear magnetic resonance; ferroelectric liquid crystalline system; phase transitions
- Citation
- JOURNAL OF MAGNETICS, v.15, no.2, pp.61 - 63
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF MAGNETICS
- Volume
- 15
- Number
- 2
- Start Page
- 61
- End Page
- 63
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/116347
- DOI
- 10.4283/JMAG.2010.15.2.061
- ISSN
- 1226-1750
- Abstract
- We used Ill 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-octanoyloxybipheny1-4'-carboxylate (C8), with a carbon number n = 8. While the recrystallization and isotropic phase transitions exhibited a first-order nature in the ill 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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