Acharya Bharat R, Primak Andrew, Kumar Satyendra
Department of Physics, Kent State University, Kent, Ohio 44242, USA.
Phys Rev Lett. 2004 Apr 9;92(14):145506. doi: 10.1103/PhysRevLett.92.145506.
A biaxial nematic phase had been predicted with D(2h) symmetry, wherein the mesogen's long and short transverse axes are simultaneously aligned along the two orthogonal, primary and secondary directors, n and m, respectively. The unique low-angle x-ray diffraction patterns in the nematic phases exhibited by three rigid bent-core mesogens clearly reveal their biaxiality. The results of x-ray diffraction can be readily reproduced by ab initio calculations that explicitly include the bent-core shape in the form factor and assume short-range positional correlations.
