Visible spectroscopy of 5CB/8CB liquid crystals

Abstract

Electro-optical properties of nematic liquid crystals (LCs) have attracted a great deal of research interest and have resulted in a number of practical applications in many areas. In the present study, wavelength dependence of electro-optical properties of two different types of nematic LCs and their binary mixtures are investigated. LCs used in this study are 5CB and 8CB and their mixtures in different proportions. The optical transmittance of the structures has been studied by means of visible spectroscopy by measuring the transmitted light intensity as a function of the wavelength under various driving AC electric field values. Experiments were carried out at the wavelength interval 380À780 nm at a constant temperature of 25 C in order to see the effect of the applied field alone.

Crystalline-like ordering of 8CB liquid crystals revealed by time-domain Brillouin scattering

“…One of the most rigorously studied LCs, 8CB, has drawn considerable attention in research regarding its prototypical thermotropic nature in phase transition studies. The properties of 8CB in bulk, or confined in nanosized pores, have been widely studied through light scattering, X-ray, dielectric, and calorimetric spectroscopic analyses by various authors [3][4][5][6][7][8][9][10][11][12]. Nonetheless, there is barely any information that connects the viscoelastic properties of 8CB across its structural phases with the confinement parameters over a wide range in liquid thicknesses.…”