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- W2971728144 abstract "We present a mean field theory to describe uniaxial (NTB,U) and biaxial twist-bend nematic (NTB,B) phases of banana-shaped liquid crystalline molecules with an axial chirality. We first derive a tensor order parameter for the banana-shaped molecules as a function of a bend angle (0∘<θAB<180∘), a torsion angle ξ for the axial chirality, and four orientational order parameters, which describe uniaxial and biaxial nematic phases. Depending on the bend angle and the strength of an oblique twisting power of the banana-shaped molecules, we calculate phase diagrams on the temperature−bend angle plane. We derive the analytical formulas for two Landau points (LPs): one is at the bend angle 109.5∘ and the other is at θAB(ξ)(>70.5∘), which depends on the torsion angle. We also find that the NTB phase appears outside the two LP angles and the phase diagrams show a rich variety of phase transitions, such as the second-order uniaxial nematic (NU)−NTB,B and the second-order NTB,U−NTB,B phase transitions, etc." @default.
- W2971728144 created "2019-09-12" @default.
- W2971728144 creator A5011874156 @default.
- W2971728144 date "2019-09-03" @default.
- W2971728144 modified "2023-10-01" @default.
- W2971728144 title "Twist-bend nematic phases of banana-shaped molecules with an axial chirality" @default.
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- W2971728144 doi "https://doi.org/10.1080/02678292.2019.1650967" @default.
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