Nano-doped weakly polar versus highly polar liquid crystal

Kamal Kumar Pandey,Abhishek Kumar Misra,Rajiv Manohar

doi:10.1007/s13204-015-0423-9

Kamal Kumar Pandey, Abhishek Kumar Misra + Show 1 more

Open Access

https://doi.org/10.1007/s13204-015-0423-9

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Abstract

Nanoparticles doped liquid crystal show changed dielectric properties in comparison to pure liquid crystals. These changes are strongly dependent on the inherent properties of guest and host particles. In the present work we have done comparative dielectric study of highly polar nematic liquid crystals 5CB and weakly polar liquid crystal D6AOB and its 1 % wt/wt concentration with zinc oxide nanoparticles (1 % Cu) doped. The relaxation modes in pure and nano doped samples are explained properly. We have also analyzed the dielectric anisotropy and relaxation frequency for all the samples.

Highlights

The reorientation of nematic liquid crystal (LC) molecules in optical fields has been studied extensively in the past decade (Bender et al 2001; Van Boxtel et al 2004)
We have studied the dynamics of molecules in terms of the dielectric permittivity, relaxation frequency and dielectric anisotropy
In order to study the influence of the ZONPs (1 % Cu) on the rotational motions of the molecules of the pure liquid crystal, the dielectric relaxation spectra were obtained for D6AOB and 5 CB in their pure and 1 %wt/wt nano particles doped forms

Summary

Introduction

The reorientation of nematic liquid crystal (LC) molecules in optical fields has been studied extensively in the past decade (Bender et al 2001; Van Boxtel et al 2004). Dielectric experimental studies of nematic LCs can provide information about the molecular arrangement, intermolecular interaction and the dynamics of reorientational motions. Investigations involving the measurement of temperature variation of the dielectric anisotropy, dielectric permittivity, relaxation strength and relaxation time in the nematic phase provide valuable information regarding the nematic orientational order and the growth of dipole correlation (Merkel et al 2006). Most of these studies are generally with the 5CB, E49, MBBA etc in their pure and doped forms with different doping particles (Van Boxtel et al 2004; Lynch and Patrick 2002; Prasad et al 2006). The fitting parameters are n and a for dielectric permittivity and k, a, A and m for loss

Findings

Result and discussion

Conclusion