화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.436, 1061-1070, 2005
Static dielectric studies of two nematogenic compounds
Static dielectric constants of two nematogenic compounds viz., (i) 1-hexyl-4-(4-iso-thiocyanatophenyl) bicyclo [2,2,2] octane and (ii) 4'-(pentyloxy)-4-biphenyl carbonitrile, have been measured at different temperatures using a sensitive LCR bridge. Using these data the dipole moment associated with the molecules is estimated. The validity of this approach is discussed by comparing the order parameter S obtained from the refractive index data with the values of S computed from the predications of the mean-field theories. Boardewijk's theory is applied here with appropriate molecular parameters, to compute dipole-dipole correlation factors.