Dynamic light scattering and viscosity measurements in a ternary and quaternary discotic lyotropic nematic liquid crystal : tuning the backflow with salt

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dc.authorid0000-0002-6339-8699en_US
dc.authorid0000-0002-9854-5177en_US
dc.contributor.authorRisi, C. L. S.
dc.contributor.authorFigueiredo Neto, Antonio Martins
dc.contributor.authorAkpınar, Erol
dc.contributor.authorLacerda Santos, M. B.
dc.date.accessioned2021-06-23T19:34:20Z
dc.date.available2021-06-23T19:34:20Z
dc.date.issued2013
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractUsing a dynamic light scattering technique, we measure the damping rate of thermal fluctuations of the nematic director for the so-called disklike nematic N-D phase of both the ternary lyotropic K-laurate-1-decanol-H2O system and the quaternary one of similar composition except for the addition of salt (K2SO4). By varying the scattering angle in suitable geometries and polarizations, we are able to measure the orientational diffusivities associated with the pure deformations of splay and twist. A previous study made in the N-D phase of the same ternary system yielded a large deviation between the splay and twist diffusivities. The effect was then interpreted in terms of the anisotropy between their associated viscosities due to induced flows, or backflow. In the present work we observe a strong increase of the backflow as an effect of the added salt. In addition, we make auxiliary measurements of shear viscosity and magnetic instabilities, which help to characterize the effect of the salt in the orientational diffusivities as they are mixed quantities involving elastic constants and viscosity coefficients.en_US
dc.identifier.doi10.1103/PhysRevE.88.022506
dc.identifier.issn1539-3755
dc.identifier.issn1550-2376
dc.identifier.issue2en_US
dc.identifier.pmid24032855en_US
dc.identifier.scopus2-s2.0-84884221717en_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.urihttps://doi.org/10.1103/PhysRevE.88.022506
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7475
dc.identifier.volume88en_US
dc.identifier.wosWOS:000323576400010en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.institutionauthorAkpınar, Erol
dc.language.isoenen_US
dc.publisherAmer Physical Socen_US
dc.relation.ispartofPhysical Review Een_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleDynamic light scattering and viscosity measurements in a ternary and quaternary discotic lyotropic nematic liquid crystal : tuning the backflow with salten_US
dc.typeArticleen_US

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WoS İndeksli Yayınlar Koleksiyonu
Kimya Bölümü Koleksiyonu
PubMed İndeksli Yayınlar Koleksiyonu
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