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Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals

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Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals. / Gleeson, H. F.; Southern, C. D.; Brimicombe, P. D. et al.
In: Liquid Crystals, Vol. 37, No. 6-7, 923874813, 2010, p. 949-959.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Gleeson, HF, Southern, CD, Brimicombe, PD, Goodby, JW & Gortz, V 2010, 'Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals', Liquid Crystals, vol. 37, no. 6-7, 923874813, pp. 949-959. https://doi.org/10.1080/02678292.2010.488818

APA

Gleeson, H. F., Southern, C. D., Brimicombe, P. D., Goodby, J. W., & Gortz, V. (2010). Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals. Liquid Crystals, 37(6-7), 949-959. Article 923874813. https://doi.org/10.1080/02678292.2010.488818

Vancouver

Gleeson HF, Southern CD, Brimicombe PD, Goodby JW, Gortz V. Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals. Liquid Crystals. 2010;37(6-7):949-959. 923874813. doi: 10.1080/02678292.2010.488818

Author

Gleeson, H. F. ; Southern, C. D. ; Brimicombe, P. D. et al. / Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals. In: Liquid Crystals. 2010 ; Vol. 37, No. 6-7. pp. 949-959.

Bibtex

@article{36b481d55e084d5b8fa0b7b81ec3348c,
title = "Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals",
abstract = "The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [1] to measure the order parameter, [image omitted]. This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure [image omitted] it is also possible to determine [image omitted]. A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.",
keywords = "orientational order parameters, polarised Raman spectroscopy, biaxial order, X-RAY-DIFFRACTION, RAMAN-SPECTROSCOPY, PHASE-TRANSITIONS, PARAMETERS, SCATTERING, POLYMERS, BEHAVIOR",
author = "Gleeson, {H. F.} and Southern, {C. D.} and Brimicombe, {P. D.} and Goodby, {J. W.} and V. Gortz",
year = "2010",
doi = "10.1080/02678292.2010.488818",
language = "English",
volume = "37",
pages = "949--959",
journal = "Liquid Crystals",
issn = "0267-8292",
publisher = "Taylor and Francis Ltd.",
number = "6-7",

}

RIS

TY - JOUR

T1 - Optical measurements of orientational order in uniaxial and biaxial nematic liquid crystals

AU - Gleeson, H. F.

AU - Southern, C. D.

AU - Brimicombe, P. D.

AU - Goodby, J. W.

AU - Gortz, V.

PY - 2010

Y1 - 2010

N2 - The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [1] to measure the order parameter, [image omitted]. This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure [image omitted] it is also possible to determine [image omitted]. A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.

AB - The use of optical methods to study the orientational order in nematic liquid crystals is both convenient and powerful. Some of the earliest approaches made use of measurements of the refractive index anisotropy, following the methodology of Halle [1] to measure the order parameter, [image omitted]. This method is reviewed briefly and some typical areas of application are presented. Raman spectroscopy is a second approach discussed in this paper. Although technically a more complex methodology, Raman spectroscopy has the significant advantage that in addition to being able to measure [image omitted] it is also possible to determine [image omitted]. A review of current approaches is presented. Very recently, it has been shown that polarised Raman spectroscopy can be employed to determine biaxial order parameters in liquid crystals. The methodology is described, and data are presented for such measurements on a series of bent-core nematic materials that could exhibit the elusive biaxial nematic phase.

KW - orientational order parameters

KW - polarised Raman spectroscopy

KW - biaxial order

KW - X-RAY-DIFFRACTION

KW - RAMAN-SPECTROSCOPY

KW - PHASE-TRANSITIONS

KW - PARAMETERS

KW - SCATTERING

KW - POLYMERS

KW - BEHAVIOR

U2 - 10.1080/02678292.2010.488818

DO - 10.1080/02678292.2010.488818

M3 - Journal article

VL - 37

SP - 949

EP - 959

JO - Liquid Crystals

JF - Liquid Crystals

SN - 0267-8292

IS - 6-7

M1 - 923874813

ER -