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http://dx.doi.org/10.4283/JMAG.2010.15.2.061

1H Nuclear Magnetic Resonance of a Ferroelectric Liquid Crystalline System  

Cha, J.K. (Department of Physics and Institute for Nano Science, Korea University)
Lee, K.W. (Department of Physics and Institute for Nano Science, Korea University)
Oh, I.H. (Department of Physics and Institute for Nano Science, Korea University)
Han, J.H. (Department of Physics and Institute for Nano Science, Korea University)
Lee, Cheol-Eui (Department of Physics and Institute for Nano Science, Korea University)
Jin, J.I. (Department of Chemistry, Korea University)
Choi, J.Y. (Department of Computer Science, Korea University)
Publication Information
Journal of Magnetics / v.15, no.2, 2010 , pp. 61-63 More about this Journal
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.
Keywords
nuclear magnetic resonance; ferroelectric liquid crystalline system; phase transitions;
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