Abstract
1H nuclear magnetic resonance (NMR) was employed in order to probe an incommensuratecommensurate phase transition in a dimesogenic liquid crystal, N-[4-(6-cholesteryloxycarbonyl) pentyloxy]-4-n-butylazobenzene (KI5A). The recrystallization and the isotropic phase transitions exhibited a discontinuous first-order nature in the 1H NMR spin-lattice (T1) and in the spin-spin relaxation time (T2E) measurements, and an incommensurate smectic A (SAinc) to commensurate helical smectic C (S*C) liquid crystalline phase transition was marked by a discontinuity in the NMR line splitting representing the orientational order. Furthermore, T1 and T2E showed distinct temperature dependencies in the SAinc phase and in the S*C phase.
Original language | English |
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Pages (from-to) | 838-840 |
Number of pages | 3 |
Journal | Journal of the Korean Physical Society |
Volume | 72 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2018 Apr 1 |
Keywords
- Commensurate-incommensurate phase transition
- Dimesogenic liquid crystal
- H nuclear magnetic resonance
ASJC Scopus subject areas
- Physics and Astronomy(all)