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Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering

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Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering. / Southern, C. D.; Brimicombe, P. D.; Siemianowski, S. D. et al.

In: EPL, Vol. 82, No. 5, 56001, 06.2008.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Southern, CD, Brimicombe, PD, Siemianowski, SD, Jaradat, S, Roberts, N, Gortz, V, Goodby, JW & Gleeson, HF 2008, 'Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering', EPL, vol. 82, no. 5, 56001. https://doi.org/10.1209/0295-5075/82/56001

APA

Southern, C. D., Brimicombe, P. D., Siemianowski, S. D., Jaradat, S., Roberts, N., Gortz, V., Goodby, J. W., & Gleeson, H. F. (2008). Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering. EPL, 82(5), [56001]. https://doi.org/10.1209/0295-5075/82/56001

Vancouver

Southern CD, Brimicombe PD, Siemianowski SD, Jaradat S, Roberts N, Gortz V et al. Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering. EPL. 2008 Jun;82(5):56001. doi: 10.1209/0295-5075/82/56001

Author

Southern, C. D. ; Brimicombe, P. D. ; Siemianowski, S. D. et al. / Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering. In: EPL. 2008 ; Vol. 82, No. 5.

Bibtex

@article{c36046f1d0c04119adbe42cfb105fbcb,
title = "Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering",
abstract = "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.",
keywords = "LIQUID-CRYSTALS, ORIENTATIONAL ORDER, MOLECULES, SYMMETRY, MESOGENS",
author = "Southern, {C. D.} and Brimicombe, {P. D.} and Siemianowski, {S. D.} and S. Jaradat and N. Roberts and V. Gortz and Goodby, {J. W.} and Gleeson, {H. F.}",
year = "2008",
month = jun,
doi = "10.1209/0295-5075/82/56001",
language = "English",
volume = "82",
journal = "EPL",
issn = "0295-5075",
publisher = "IOP Publishing Ltd.",
number = "5",

}

RIS

TY - JOUR

T1 - Thermotropic biaxial nematic order parameters and phase transitions deduced by Raman scattering

AU - Southern, C. D.

AU - Brimicombe, P. D.

AU - Siemianowski, S. D.

AU - Jaradat, S.

AU - Roberts, N.

AU - Gortz, V.

AU - Goodby, J. W.

AU - Gleeson, H. F.

PY - 2008/6

Y1 - 2008/6

N2 - 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.

AB - 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.

KW - LIQUID-CRYSTALS

KW - ORIENTATIONAL ORDER

KW - MOLECULES

KW - SYMMETRY

KW - MESOGENS

UR - http://www.scopus.com/inward/record.url?scp=79051471232&partnerID=8YFLogxK

U2 - 10.1209/0295-5075/82/56001

DO - 10.1209/0295-5075/82/56001

M3 - Journal article

VL - 82

JO - EPL

JF - EPL

SN - 0295-5075

IS - 5

M1 - 56001

ER -