Surfactant induced interfacial anchoring transitions in nematic liquid crystal droplets on glass surfaces

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dc.contributor.author Kulkarni, Siddharth Vijay
dc.contributor.author Thareja, Prachi
dc.date.accessioned 2016-10-10T19:31:33Z
dc.date.available 2016-10-10T19:31:33Z
dc.date.issued 2017-06
dc.identifier.citation Kulkarni, Siddharth and Thareja, Prachi, “Surfactant induced interfacial anchoring transitions in nematic liquid crystal droplets on glass surfaces”, Surface Review and Letters, DOI: 10.1142/S0218625X17500445 , vol. 24, no. 04, June. 2017. en_US
dc.identifier.issn 0218-625X
dc.identifier.issn 1793-6667
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2480
dc.identifier.uri http://dx.doi.org/10.1142/S0218625X17500445
dc.description.abstract The interfacial adsorption of surfactants at planar nematic liquid crystal (NLC)–water interface induces an ordering transition from a tilted to perpendicular anchoring with the increase in surfactant concentration at CN=C∕Ccmc≪1CN=C∕Ccmc≪1, where CcmcCcmc is the Critical Micelle Concentration of surfactants in water. In this study, we show that depending upon the surfactant structure a tilted to perpendicular NLC anchoring transition is observed at C∕Ccmc≥1C∕Ccmc≥1 in 5CB droplets of size 50–70μμm. Micrometer sized 5CB droplets are deposited on glass surfaces using flow coating of 5CB-in-ethanol solutions. When placed on 5CB drop decorated glass surfaces, the aqueous surfactant solutions of aliphatic chain surfactants (SDS, CTAB and CPBr) at CN<1CN<1, result in an optical transition to a bright-cross texture attributed to the tilted anchoring of 5CB molecules at 5CB–water interface. At C∕Ccmc≥1C∕Ccmc≥1, perpendicular anchoring of 5CB molecules at 5CB–water interface results in a droplet texture with a hedgehog defect. In contrast, aqueous solutions of SDBS lead to 5CB droplets with a bright-cross texture regardless of the surfactant concentration in the aqueous phase. These results indicate that the orientation of 5CB molecules is independent of the nature of the surfactant headgroup. In addition, 5CB droplet decorated OTS treated glass substrates show a hedgehog texture which disappears completely on exposure to organic vapors with the response time-dependent on the polarity of the vapor molecules. en_US
dc.description.statementofresponsibility by Siddharth Kulkarni and Prachi Thareja
dc.format.extent vol. 24, no. 04,
dc.language.iso en_US en_US
dc.publisher World Scientific Publishing en_US
dc.subject Nematic liquid crystals en_US
dc.subject Interfaces en_US
dc.subject surfaces en_US
dc.title Surfactant induced interfacial anchoring transitions in nematic liquid crystal droplets on glass surfaces en_US
dc.type Article en_US
dc.relation.journal Surface Review and Letters


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