%0 Journal Article
%T Structure and Lehmann rotation of drops in a surfactant-doped bent-core liquid crystal
%+ Laboratoire de Physique de l'ENS Lyon (Phys-ENS)
%+ Laboratoire Charles Coulomb (L2C)
%A Oswald, Patrick
%A Poy, Guilhem
%A Krishnamurthy, Kanakapura
%< avec comité de lecture
%@ 2470-0045
%J Physical Review E
%I American Physical Society (APS)
%V 106
%N 2
%P 024705
%8 2022-08
%D 2022
%R 10.1103/PhysRevE.106.024705
%Z PACS numbers: 61-30.Eb, 61-30.Dk, 62.25.-g
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]Journal articles
%X The structure of the nematic (cholesteric) drops that form at the clearing temperature of a mixture of the bent-core molecule CB7CB and the rod-like molecule 8CB doped with a surfactant is optically determined. Using experimental observations and numerical simulations, it is demonstrated that the director field inside these drops is not escaped-concentric as previously proposed, but twisted-bipolar. The Lehmann rotation of these drops in the presence of a temperature gradient is described. Their rotation velocity is shown to be proportional to the temperature gradient and to the surface twist angle of the director field and inversely proportional to the drop radius, thus revealing a fundamental scaling law for the Lehmann effect of nematic/cholesteric twisted bipolar droplets.
%G English
%2 https://hal.science/hal-03795722/document
%2 https://hal.science/hal-03795722/file/Oswald_Poy_KSK_PRE2022cor.pdf
%L hal-03795722
%U https://hal.science/hal-03795722
%~ ENS-LYON
%~ CNRS
%~ L2C
%~ UNIV-MONTPELLIER
%~ SORBONNE-UNIVERSITE
%~ UDL
%~ UNIV-LYON
%~ SU-TI
%~ ALLIANCE-SU
%~ UM-2015-2021
%~ UM-EPE