Raman scattering study of phase biaxiality in a thermotropic bent-core nematic liquid crystal.
Polarized Raman spectroscopy was used to investigate the development of orientational order and the degree of phase biaxiality in a bent-core mesogenic system. The values of the uniaxial order parameters <P200> and <P400>, and biaxial order parameters <P220>, <P420>, and <P440>, and their evolution with temperature were determined. The temperature dependence of almost all order parameters reveals a second order transition from the uniaxial to biaxial nematic phase with <P220> increasing to ∼0.22 before a first order transition to the smectic-C phase, upon cooling.
Park
Min Sang
MS
School of Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA.
Yoon
Beom-Jin
BJ
Park
Jung Ok
JO
Prasad
Veena
V
Kumar
Satyendra
S
Srinivasarao
Mohan
M