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http://hdl.handle.net/2445/141962
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DC Field | Value | Language |
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dc.contributor.author | Oswald, Patrick | - |
dc.contributor.author | Ignés i Mullol, Jordi | - |
dc.contributor.author | Dequidt, A. | - |
dc.date.accessioned | 2019-10-09T11:57:25Z | - |
dc.date.issued | 2019-03-28 | - |
dc.identifier.issn | 1744-683X | - |
dc.identifier.uri | http://hdl.handle.net/2445/141962 | - |
dc.description.abstract | We show experimentally and theoretically that the Lehmann effect recently observed by Yoshioka and Araoka (Nat. Commun., 2018, 9, 432) in emulsified cholesteric liquid crystal droplets under temperature gradients is due to Marangoni flows rather than to the thermomechanical or chemomechanical couplings often invoked to explain the phenomenon. Using colloidal tracers we visualize convection rolls surrounding stationary cholesteric droplets in vertical temperature gradients, while a shift in the position of internal point defects reveals the corresponding inner convection in nematic droplets thermomigrating in a horizontal temperature gradient. We attribute these phenomena to the temperature dependence of the surface tension at the interface between these partially-miscible liquids, and justify their absence in the usual case of purely lyophobic emulsions. We perform a theoretical analysis to help validate this hypothesis, demonstrating the strong dependence of the precession velocity on the configuration of the cholesteric director field. | - |
dc.format.extent | 14 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Royal Society of Chemistry | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1039/c8sm02574f | - |
dc.relation.ispartof | Soft Matter, 2019, vol. 15, num. 12, p. 2591-2604 | - |
dc.relation.uri | https://doi.org/10.1039/c8sm02574f | - |
dc.rights | (c) Oswald, Patrick et al., 2019 | - |
dc.source | Articles publicats en revistes (Ciència dels Materials i Química Física) | - |
dc.subject.classification | Cristalls líquids | - |
dc.subject.other | Liquid crystals | - |
dc.title | Lehmann rotation of cholesteric droplets driven by Marangoni convection | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 691845 | - |
dc.date.updated | 2019-10-09T11:57:25Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
Files in This Item:
File | Description | Size | Format | |
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691845.pdf | 3.33 MB | Adobe PDF | View/Open |
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