Issue
EPL
Volume 88, Number 5, December 2009
Article Number 56004
Number of page(s) 4
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/88/56004
Published online 14 December 2009
EPL, 88 (2009) 56004
DOI: 10.1209/0295-5075/88/56004

Dynamic heterogeneity of a nanostructure in the hyper-swollen B4 phase of achiral bent-core molecules diluted with rod-like liquid crystals

Yuta Yamazaki, Yoichi Takanishi and Jun Yamamoto

Department of Physics, Graduate School of Science, Kyoto University - Kita-Shirakawa, Kyoto 606-8502, Japan

ytakanis@scphys.kyoto-u.ac.jp

received 9 July 2009; accepted in final form 10 November 2009; published December 2009
published online 14 December 2009

Abstract
We studied the dynamics in the chiral mesogenic phases observed in binary mixtures of 5CB and bent-core molecules by using dynamic light scattering. In the lower-temperature phase, a clear orientational fluctuation was observed, which was not observed in the higher-temperature one. The wave number dependence of the relaxation frequency strongly indicates that nanoscale phase separation occurs and that the fluctuations of 5CB with nematic order are suppressed by the bent-core–rich domains. The spatial heterogeneity of the nematic dynamic motion yields exact information on the characteristic size of the nanostructure, which cannot be obtained by static structural analysis.

PACS
61.30.-v - Liquid crystals.
42.70.Df - Optical materials: Liquid crystals.
78.35.+c - Brillouin and Rayleigh scattering; other light scattering.

© EPLA 2009