Title

X-ray diffraction from the uniaxial and biaxial nematic phases of bent core mesogens

Publication Title

Liquid Crystals

Publication Date

2008

Document Type

Article

DOI

10.1080/02678290701817326

Keywords

X-ray diffraction, uniaxial–biaxial phase transition, biaxial nematic phase, bent-core mesogen

Disciplines

Physics

Abstract

X-ray diffraction patterns for the uniaxial and biaxial nematic phases exhibited by rigid bent-core mesogens were calculated using a simple model for the molecular form factor and a modified Lorentzian structure factor. The X-ray diffraction patterns depend strongly on the extent of the alignment of the molecular axes as well as the orientation of molecular planes. The X-ray diffraction can be unequivocally used to identify the biaxial nematic phase, study the uniaxial–biaxial phase transition, and estimate the order parameters of the nematic phase.