Comment on “Dynamics of electro-optical switching processes in surface stabilized biaxial nematic phase found in bent-core liquid crystal” [J. Appl. Phys. 101, 034105 (2007)]

Lee et al. [J. Appl. Phys 101, 034105 (2007)] studied the Fréedericksz transition of a nematic bent-core mesogen in a planar cell. They claim that they have distinguished two different nematic phases in optical experiments, a uniaxial phase at a high temperature and a biaxial phase at a lower temperature. The commented paper contains several problematic passages and the substantial parts of the conclusions are invalid. Some experimental data appear to be inconsistent or incorrectly interpreted. We review the data and their interpretation, and analyze which conclusions are actually justified.