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.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
J. P. F. Lagerwall and F. Giesselmann, Chem. Phys. Chem. 7, 20 (2006).
P. G. de Gennes and J. Prost, The Physics of Liquid Crystals (Oxford University Press, Oxford, 1993).
D. Demus, J. Goodby, G. W. Gray, H-W. Spiess and V. Vill, Handbook of Liquid Crystals, Fundamentals, Vol. 1 (Wiley-VCH, New York, 1998).
S. Kumar, Liquid Crystals: Experimental Study of Physical Properties and Phase Transitions (Cambridge University Press, Cambridge, 2000).
K. W. Lee, C. H. Lee, S. H. Yang, J. K. Cha, C. E. Lee and J. Kim, Curr. Appl. Phys. 1, 529 (2001).
J. K. Cha, K. W. Lee, C. E. Lee and J-I. Jin, Appl. Phys. Lett. 96, 092903 (2010).
J. K. Cha, K. W. Lee, J. H. Han, C. E. Lee, J-I. Jin and J. Y. Choi, J. Magn. 15, 61 (2010).
F. Hardouin, M. F. Achard, J-I. Jin, J-W. Shin and Y-K. Yun, J. Phys. II France 4, 627 (2994).
F. Hardouin, M. F. Achard, J-I. Jin and Y-K. Yun, J. Phys. II France 5, 927 (1995).
Y. Maeda, Y-K. Yun and J-I. Jin, Thermochimica Acta 322, 101 (1998).
I-H. Oh, J. J. Kweon, B. H. Oh and C. E. Lee, J. Korean Phys. Soc. 53, 3497 (2008).
D. Y. Han, J. H. Han, C. E. Lee and S-H. Kim, J. Korean Phys. Soc. 53, 3246 (2008).
S. Miyajima, N. Nakamura and H. Chihara, Mol. Cryst. Liq. Cryst. 89, 151 (1982).
P. Pincus, Solid State Commun. 7, 415 (1969).
P. Ukleja, J. Pirs and J. W. Doane, Phys. Rev. A 14, 44 (1976).
R. Y. Dong, M. Wiszniewska and E. Tomchuk, J. Chem. Phys. 59, 6266 (1973).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, K.O., Choi, D.M., Lee, C.E. et al. 1H Nuclear Magnetic Resonance Study of an Incommensurate-Commensurate Phase Transition in a Dimesogenic Liquid Crystal. J. Korean Phys. Soc. 72, 838–840 (2018). https://doi.org/10.3938/jkps.72.838
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.72.838