Experimental study of surfactant driven nematic liquid crystal (NLC) anchoring transitions at solid surfaces: role of solid surface energy and anisotropic NLC – solid interfacial energy

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dc.contributor.author Kulkarni, Siddharth Vijay
dc.contributor.author Thareja, Prachi
dc.date.accessioned 2016-04-15T13:41:43Z
dc.date.available 2016-04-15T13:41:43Z
dc.date.issued 2016-03
dc.identifier.citation Kulkarni, Siddharth and Thareja, Prachi, “Experimental study of surfactant driven nematic liquid crystal (NLC) anchoring transitions at solid surfaces: role of solid surface energy and anisotropic NLC – solid interfacial energy”, Journal of Adhesion Science and Technology, DOI: 10.1080/01694243.2016.1145784, vol. 30, no. 13, pp. 1371-1390, Mar. 2016.
dc.identifier.issn 0169-4243
dc.identifier.uri http://dx.doi.org/10.1080/01694243.2016.1145784
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2173
dc.description.abstract The fundamental understanding of nematic liquid crystal (NLC) alignment on solid surfaces is significant for the operation of liquid crystal displays and devices. We investigate the effect of structure and concentration of surfactants on the anchoring of NLC 4-cyano-4′-pentylbiphenyl (5CB) at 5CB–solid interface. 5CB molecules undergo an ordering transition from parallel to normal anchoring near the surfactant critical micelle concentration depending on the chemical structure of the surfactant tails. In contrast to the previous studies which point to the solubilization of 5CB in surfactant micelles, our experiments indicate that NLC anchoring transition occurs due to the ability of 5CB molecules to penetrate into the surface surfactant layer. The surfactant-driven 5CB anchoring is further related to the surface tension of 5CB (γ5CB), surfactant adsorbed substrate surface energy (γsa), anisotropic 5CB–surface interfacial energy (Δγsl), and spreading coefficient (S). Our experimental results agree with the Creagh–Kahn criterion of predicting surface anchoring from relative values of γsa and γ5CB. A change in the sign of Δγsl and S is also observed along with the anchoring transition. Using a semi-empirical approach, we show that dipolar interactions dominate over dispersion interactions when 5CB molecules exhibit perpendicular anchoring at the solid–5CB interface. en_US
dc.description.statementofresponsibility by Siddharth Kulkarni and Prachi Thareja
dc.format.extent vol. 30, no. 13, pp. 1371-1390
dc.language.iso en_US en_US
dc.publisher Taylor and Francis en_US
dc.subject Surfactants en_US
dc.subject Nematic liquid crystals en_US
dc.subject Anchoring en_US
dc.subject Surface energy en_US
dc.title Experimental study of surfactant driven nematic liquid crystal (NLC) anchoring transitions at solid surfaces: role of solid surface energy and anisotropic NLC – solid interfacial energy en_US
dc.type Article en_US
dc.relation.journal Journal of Adhesion Science and Technology


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