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Article Dans Une Revue Liquid Crystals Année : 2024

Theoretical model for the Frank elastic moduli in the intercalated SmA b phase of bent-shaped dimers

Résumé

In our previous works we have shown that the elastic properties of the intercalated SmAb phase formed by bent-shaped dimers are governed by the nematic-like behaviour of the secondary director m that is associated with the projection of the molecular axes of the monomers on the plane of the smectic layer. From the experiment, the corresponding three Frank-like moduli Km11, Km22 and Km33 related to the secondary director demonstrate the usual behaviour of the Frank moduli of the nematics formed by rod-like molecules: monotonously increase with decreasing temperature. This is contrary to the temperature dependence of the elastic moduli for the primary director of N and NTB phases formed by bent-shaped dimers (for which the bend elastic constant decreases with temperature to zero). However, the values of the Frank-like moduli for SmAb were found to be smaller than their nematic-phase equivalents, and demonstrate a strong and unusual anisotropy, with Km11 : Km22 : Km33 ratio being approximately 30 : 1 : 10. Here we present a theoretical model based on the assumption of the nematic-like order within the smectic layers that provides a qualitative explanation of the experimental results.
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Dates et versions

hal-04516637 , version 1 (22-03-2024)

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Claire Meyer, Tatiana Sergan, Vassili Sergan, Daniel Stoenescu, Patrick Davidson, et al.. Theoretical model for the Frank elastic moduli in the intercalated SmA b phase of bent-shaped dimers. Liquid Crystals, 2024, pp.1-14. ⟨10.1080/02678292.2024.2306318⟩. ⟨hal-04516637⟩
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