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DC Field | Value | Language |
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dc.contributor.author | Krishnamurthy, Kanakapura S | - |
dc.contributor.author | Rao, Shankar D.S. | - |
dc.contributor.author | Kanakala, Madhu B | - |
dc.contributor.author | Yelamaggad, C.V. | - |
dc.contributor.author | Madhusudana, N.V. | - |
dc.date.accessioned | 2020-05-27T06:18:58Z | - |
dc.date.available | 2020-05-27T06:18:58Z | - |
dc.date.issued | 2020-03 | - |
dc.identifier.citation | Physical Review E, 2020, Vol.101, Article No.032704 | en_US |
dc.identifier.issn | 2470-0045 | - |
dc.identifier.issn | 2470-0053 (Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/7468 | - |
dc.description | Open Access | en_US |
dc.description.abstract | We report experimental studies on the phase behavior of binary mixtures of 1 ,7 -bis(4-cyanobiphenyl-4 -yl)heptane (CB7CB) and 4,4-diheptyloxyazoxybenzene, which exhibit, apart from the nematic (N) and twistbend nematic (NTB) phases, the induced smectic-A (Sm-A) phase for weight fraction of CB7CB between 0.05 and 0.70. In planar nematic layers, the NTB phase separates as droplets of tactoidlike planform; the chirality of droplets manifests in the optical dissimilarity between their opposite angular ends. Our main result is that, in the appropriate two phase region, Sm-A nuclei with positive dielectric anisotropy change over to disks immersed in the nematic above some electric field, their edges decorated by periodic bright spots, a result which was earlier reported in another binary system exhibiting the induced Sm-A phase [R. Pratibha and N. V. Madhusudana, Physica A 224, 9 (1996)]. We develop a simple theory for the threshold of this distortion, which is a periodic undulation of the edge of the disk, demonstrating that it arises from saddle-splay elasticity of Sm-A, the low Sm-A–N interfacial tension unable to suppress the distortion. The observed increases in the number of brightspots with field, and with the radius of the disk at a given field, in both the experimental systems are also accounted for by the model. The distortion, which results in the most direct visualization of saddle splay in Sm-A, is also exhibited by disks nucleating on surfaces treated for homeotropic anchoring. | en_US |
dc.language.iso | en | en_US |
dc.publisher | American Physical Society | en_US |
dc.relation.uri | https://doi.org/10.1103/PhysRevE.101.032704. | en_US |
dc.rights | 2020 American Physical Society | en_US |
dc.title | Saddle-splay-induced periodic edge undulations in smectic-A disks immersed in a nematic medium | en_US |
dc.type | Article | en_US |
Appears in Collections: | Research Papers (SCM) |
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2020_Phys Rev E_Vol.101_Article No.032704.pdf Restricted Access | Open Access | 4.41 MB | Adobe PDF | View/Open Request a copy |
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