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Article Dans Une Revue Journal of Chemical Physics Année : 2020

Crystalline-like ordering of 8CB liquid crystals revealed by time-domain Brillouin scattering

Résumé

We demonstrate that time-domain Brillouin scattering (TDBS), a technique based on an ultrafast pump-probe approach, is sensitive to phase transitions and apply it to the study of structural changes of 8CB liquid crystals at different temperatures across the isotropic, nematic, smectic and crystalline phases. We investigate the viscoelastic properties of 8CB squeezed in a narrow gap, from nanometer to submicrometer thickness range, and conclude on the long-range molecular structuring of the smectic phase. These TDBS results reveal that confinement effects favor structuring of the smectic phase into a crystalline-like phase that can be observed at extended distances far beyond the molecular dimensions.
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Dates et versions

hal-03047097 , version 1 (08-12-2020)

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Ievgeniia F Chaban, Christoph Klieber, Rémi Busselez, Keith A Nelson, Thomas Pezeril. Crystalline-like ordering of 8CB liquid crystals revealed by time-domain Brillouin scattering. Journal of Chemical Physics, 2020, 152 (1), pp.014202. ⟨10.1063/1.5135982⟩. ⟨hal-03047097⟩
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