Thermomechanical Effects in Liquid Crystals

Oswald, P.; Dequidt, Alain; Poy, Guilhem

doi:10.1002/9781119850809.ch3

Cited by 3 publications

(2 citation statements)

References 83 publications

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“…This result is important and confirms our intuition that the differences of several orders of magnitude reported in the literature between the thermomechanical and thermohydrodynamical coefficients of Akopyan and Zel'dovich in nematics are likely due to artifacts (for an in-depth discussion of this issue, see Ref. [19]).…”

Section: Discussionsupporting

confidence: 87%

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Chemical Leslie effect in a chiral smectic-C★ film: Nonsingular target patterns

Bunel

Oswald²

2023

Phys. Rev. E

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We analyze experimentally and theoretically the winding and the unwinding of the c-director in a chiral smectic C film crossed by an ethanol flow. This leads to a target pattern under crossed polarizers when the +1 defect imposed by the boundary conditions is pinned on the edge of the film. We show that the target is deformed at the center of the film when it is subjected to a flow of ethanol because of the presence of two recirculation vortices of chemohydrodynamical origin. This deformation and the two vortices disappear during the unwinding of the target when the ethanol flow is stopped. This unambiguously shows that the target deformation is due to the vortices and not to the elastic anisotropy. These two points are confirmed theoretically. An estimate of the two so-called chemomechanical and chemohydrodynamical Leslie coefficients is also derived from this study.

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Section: Discussionsupporting

confidence: 87%

“…To the best of our knowledge, this effect has not yet been observed. We refer the reader to the review article [19] for the description of possible experiments that could be carried out to observe this effect in cholesterics.…”

Section: Introductionmentioning

confidence: 99%

Chemical Leslie effect in a chiral smectic-C★ film: Nonsingular target patterns

Bunel

Oswald²

2023

Phys. Rev. E

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Regularity for a Fractional Liquid Crystal Model with Anomalous Dissipation and Thermal Effects

Palencia

2024

Braz J Phys

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Design of nematic liquid crystals to control microscale dynamics

Lavrentovich

2020

Liquid Crystals Reviews

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Dynamics of small particles, both living such as swimming bacteria and inanimate, such as colloidal spheres, has fascinated scientists for centuries. If one could learn how to control and streamline their chaotic motion, that would open technological opportunities in areas such as the transformation of stored or environmental energy into systematic motion, micro-robotics, and transport of matter at the microscale. This overview presents an approach to command microscale dynamics by replacing an isotropic medium such as water with an anisotropic fluid, a nematic liquid crystal. Orientational order leads to new dynamic effects, such as propagation of particle-like solitary waves. Many of these effects are still awaiting their detailed mathematical description. By using plasmonic metamask

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Thermomechanical Effects in Liquid Crystals

Cited by 3 publications

References 83 publications

Chemical Leslie effect in a chiral smectic-C★ film: Nonsingular target patterns

Chemical Leslie effect in a chiral smectic-C★ film: Nonsingular target patterns

Regularity for a Fractional Liquid Crystal Model with Anomalous Dissipation and Thermal Effects

Design of nematic liquid crystals to control microscale dynamics

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