Phase-segregated hydrogen bonded thermotropic liquid crystal’s optical shuttering response and electro-optical sensor application

Polar nematic phase in short-chained fluorinated hydrogen-bonded liquid crystals

“…where N is the number density of molecules, S is the order parameter, Δα is the anisotropy of the polarizability, µeff is the effective dipole moment of the molecule, θ is the angle between the dipole moment and the long axis of the molecule, F is the feedback factor and h is the cavity factor. The effective dipole moment of the molecule is related to the theoretical value of the dipole moment by the Kirkwood 'g = ( 𝜇 eff 𝜇 ) 2 ' factor, which describes the degree of parallel/antiparallel correlations between the molecules in the LCs [20,42]. The parallel arrangement is obtained for g > 1, while the antiparallel is observed for g < 1.…”

“…In the nematic phase, molecules of liquid crystal are oriented on average along a common direction, called the director, and their alignment is easily distorted by external electric or magnetic fields due to the weak orientational elasticity. A linear and rigid part of molecule made of several conjugated multiple bonds and aromatic rings ensures the thermal stability of this phase [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Polar, rod-like LC materials have attracted considerable attention as a promising candidate material for next generations of displays as they exhibit new types of nematic phases.…”