Journal
EPL
Volume 82, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/82/56001
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Funding
- Engineering and Physical Sciences Research Council [EP/D069793/1, EP/D055261/1] Funding Source: researchfish
- EPSRC [EP/D069793/1, EP/D055261/1] Funding Source: UKRI
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Raman Scattering was used to investigate biaxiality in the nematic phase formed by the bent-core material, C5-Ph-ODBP-Ph-OC12. Linearly polarised light was normally incident on a homogeneously aligned sample, and the depolarisation ratio was measured over a 360 degrees rotation of the incident polarisation for the Raman-active phenyl stretching mode. By modeling the bent-core structure and fitting to the depolarisation data, both the uniaxial ([P-200] and [P-400]) and biaxial ([P-220], [P-420] and [P-440]) order parameters, are deduced. We show unequivocally the presence of a uniaxial to biaxial nematic phase transition approximately 30 degrees C above the underlying smectic phase. Further, we report the temperature evolution of the biaxial and uniaxial order parameters, which increase in magnitude continuously with reducing temperature, reaching values of 0.1, -0.15 and -0.18 for [P-220], [P-420] and [P-440], respectively. Copyright (c) EPLA, 2008.
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