Crystalline-like ordering of 8CB liquid crystals revealed by time-domain Brillouin scattering
| Autor: | Ievgeniia Chaban, Keith A. Nelson, Christoph Klieber, Rémi Busselez, Thomas Pezeril |
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| Přispěvatelé: | Massachusetts Institute of Technology (MIT), Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science 010304 chemical physics Condensed matter physics Isotropy General Physics and Astronomy 010402 general chemistry 01 natural sciences Viscoelasticity 0104 chemical sciences Condensed Matter::Soft Condensed Matter Liquid crystal Brillouin scattering Phase (matter) 0103 physical sciences Time domain Physical and Theoretical Chemistry Ultrashort pulse [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Journal of Chemical Physics Journal of Chemical Physics, American Institute of Physics, 2020, 152 (1), pp.014202. ⟨10.1063/1.5135982⟩ |
| ISSN: | 0021-9606 1089-7690 |
| DOI: | 10.1063/1.5135982⟩ |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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