Within the framework of the continuum elastic theory of biaxial nematic liquid crystals
domain walls were studied. Nine different domain walls in biaxial nematics were found. The shapes of these walls are similar to those in uniaxial nematics. By neglecting the elastic anisotropy concerned with splay and bend distortions
it is found that the analytic solutions of splay-bend walls are similar to that of twist walls. The numerical solutions of splay-bend walls show that the ratio of the elastic constants affects the width of the walls.
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