Rotational viscosity comparison of liquid crystals based on the molecular dynamics of mixtures

Abstract

It is critical to improve the response speed of a liquid crystal wavefront corrector in order to increase the bandwidth of a liquid crystal adaptive optics system. The design of liquid crystal molecules with small rotational viscosity becomes a basic method of increasing the response speed of a liquid crystal wavefront corrector. Various phases of liquid crystal from molecular dynamics simulation are given in this paper, and the detailed computational methods of order parameter and rotational viscosity are also presented. Rotational viscosities of liquid crystals are compared based on the molecular dynamics of mixtures. The data fluctuation is reduced effectively through several simulations and the multiple analysis of original data. A detailed process of molecular dynamics of mixtures is given in this paper and the result is greatly satisfactory. We believe that one can perform a better molecular design using this process and obtain a better understanding of molecular interactions of LCs.

Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group *

“…Moreover, the viscosity value also could be calculated via a theoretical molecular dynamics method. [9] The LC compounds and mixtures with high birefringence have been reviewed in detail by Dabrowski et al [10] Furthermore, the naphthyl group can produce a longer conjugation length than the benzene group, and the LC compound with the naphthyl group will exhibit a high ∆n value. Some LC compounds with naphthyl and isothiocyanate groups, such as naphthyl-benzene isothiocyanate [11] and naphthyl-ethynyl-benzene isothiocyanate, [12] have been studied, and the ∆n value of these compounds are larger than 0.40.…”