Sign reversal in dielectric anisotropy and dielectric relaxation in bent core liquid crystals – Jagdish Vij

Date: Mon. June 13th, 2011, 12:30 pm-1:30 pm
Location: Rockefeller 221

We investigate the nematic phase of a 4-cyanoresorcinol bisbenozate compound by varying its chain length from C4 to C9 using dielectric and electro-optic spectroscopy. The frequencies and dielectric strengths of the various modes are determined. The results of the sign reversal in the dielectric anisotropy are interpreted in terms of the relative dielectric strengths of the various modes, their relaxation frequencies the order parameter of the system. The results are found to be much more interesting and complex than known so far for the calamitic Mesogens-.