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dc.contributor.authorYoon, Hyung Guenen_US
dc.contributor.authorKang, Shin-Woongen_US
dc.contributor.authorDong, Ronald Y.en_US
dc.contributor.authorMarini, Albertoen_US
dc.contributor.authorSuresh, Kattera A.en_US
dc.contributor.authorSrinivasarao, Mohanen_US
dc.contributor.authorKumar, Satyendraen_US
dc.date.accessioned2013-02-15T20:59:28Z
dc.date.available2013-02-15T20:59:28Z
dc.date.issued2010-05
dc.identifier.citationYoon, Hyung Guen; Kang, Shin-Woong; Dong, Ronald Y.; Marini, Alberto; Suresh, Kattera A.; Srinivasarao, Mohan and Kumar, Satyendra, "Nematic biaxiality in a bent-core material," Physical Review E , 81, 5, Part 1, (May 2010).en_US
dc.identifier.issn1539-3755 (print)
dc.identifier.issn1550-2376 (online)
dc.identifier.urihttp://hdl.handle.net/1853/46209
dc.description© 2010 American Physical Society. The electronic version of this article is the complete one and can be found online at: http://link.aps.org/doi/10.1103/PhysRevE.81.051706en_US
dc.descriptionDOI: 10.1103/PhysRevE.81.051706en_US
dc.description.abstractThe results of a recent investigation of the nematic biaxiality in a bent-core mesogen _A131_ are in apparent disagreement with earlier claims. Samples of mesogen A131 used in the two studies were investigated with polarized optical microscopy, conoscopy, carbon-13 NMR, and crossover frequency measurements. The results demonstrate that textural changes associated with the growth of biaxial nematic order appear at _149 °C. The Maltese cross observed in the conoscopic figure gradually splits into two isogyres at lower temperatures indicating phase biaxiality. Presence of the uniaxial to biaxial nematic phase transition is further confirmed by temperature trends of local order parameters based on 13C chemical shifts in NMR experiments. Frequency switching measurements also clearly reveal a transition at 149 °C. Differences between the two reports appear to be related to the presence of solvent, impurities, and/or adsorbed gases in samples of A131 used in the study of Van Le et al. _Phys. Rev. E 79, 030701 _2009__.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectBent-core mesogenen_US
dc.subjectBiaxial nematicen_US
dc.subjectConoscopic patternsen_US
dc.subjectNematic biaxialityen_US
dc.subjectOrder parametersen_US
dc.subjectOrder transitionsen_US
dc.subjectPhase transitionen_US
dc.subjectPolarized Raman spectroscopyen_US
dc.subjectUniaxial nematicen_US
dc.titleNematic biaxiality in a bent-core materialen_US
dc.typeArticleen_US
dc.contributor.corporatenameGeorgia Institute of Technology. Center for Organic Photonics and Electronicsen_US
dc.publisher.originalAmerican Physical Societyen_US
dc.identifier.doi10.1103/PhysRevE.81.051706en_US


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