Investigation of The Biased Rotation of Chiral Molecule Around its Long Molecular Axis in the Ferroelectric Liquid Crystal Mixture

Abstract

Spontaneous polarization (Ps), tilt angle (θ), helical pitch (p) and densytometric (ρ) characteristics versus temperature and concentration of chiral dopant have been measured for FLC mixture. On the base of computer modelling the molecular dipole moment (μ), transverse (αt) and longitudinal (α1) molecular polarizabilities as well as angle (γ and Φ0) between the vector μ and main long n and short 1 molecular axes of inertia have been calculated. Knowing the molecular parameters μ, αt, αl, γ and Φ0 and state parameters θ, p, spontaneous polarization Ps has been calculated as the vector sum of the components of molecular dipole moment μ1 perpendicular to the tilt direction. To do it the Zeks1 rotational potential modified by us2 has been used. After comparing spontaneous polarization Ps taken from experimental and obtained from theoretical approximation the biased rotation parameter η has been calculated.